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360 - Dynamic magnetic information storage or retrieval

360131000 - RECORD MEDIUM

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DocumentTitleDate
20090195929METHOD OF MANUFACTURING DISCRETE TRACK RECORDING MEDIUM AND DISCRETE TRACK RECORDING MEDIUM - According to one embodiment, a method of manufacturing a discrete track recording medium includes forming protruded magnetic patterns on a substrate, and repeating processes of depositing a nonmagnetic material so as to be filled in recesses between the magnetic patterns and etching back the nonmagnetic material two or more times with rotating the substrate in a plane thereof by an angle less than one revolution.08-06-2009
20120170152MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM MANUFACTURING METHOD - [Problem] An object is to provide a magnetic recording medium with improved HDI characteristics, such as impact resistance, and its manufacturing method.07-05-2012
20100007990MAGNETIC RECORDING MEDIUM SUBSTRATE, MAGNETIC RECORDING MEDIUM AND METHOD FOR MANUFACTURING MAGNETIC RECORDING MEDIUM SUBSTRATE - Provided are a magnetic recording medium substrate whereupon a magnetic layer can be regularly formed in a recording area, a magnetic recording medium and a method for manufacturing the magnetic recording medium substrate. A plurality of recording areas wherein the magnetic layer is to be formed are formed on the surface of the disk-shaped magnetic recording medium substrate. The size of the recording area is an integral multiple of a lattice constant of a unit lattice of a single crystal structure constituting the magnetic layer. For instance, the width of a protruding section (01-14-2010
20090122447DISK DEVICE - A disk drive includes a magnetic recording medium rotatably supported, a spindle motor for spinning the recording medium, a slider having a head, a supporting arm having the slider at a first end facing the recording medium, a bearing for holding the supporting arm rotatably along a recording surface of the medium and pivotably in a vertical direction with respect to the recording surface, a leaf spring giving thrusting force to a first end of the supporting arm toward the medium, and a driver for rotating the supporting arm along the recording surface. When the driver rotates the supporting arm along the recording surface and parks the head in a given evacuation area on the recording surface, a second end of the supporting arm is depressed.05-14-2009
20130077191MAGNETIC DISK AND MAGNETIC RECORDING/REPRODUCING APPARATUS - A magnetic disk according to an embodiment includes: a plurality of data regions each including a plurality of tracks, each of the tracks being arranged to extend in a circumferential direction; a servo region provided between the data regions, the servo region extending in a radial direction, the servo region including: a plurality of guide patterns each extending in the radial direction; and at least one line of dots arranged by post patterns in the radial direction at least on a side of one of adjacent guide patterns, the post patterns being arranged in the radial direction between the adjacent guide patterns.03-28-2013
20100073819SERVO PATTERNS FOR SELF-ASSEMBLED ISLAND ARRAYS - Servo patterns and associated methods of fabricating servo patterns are described. For patterned storage media, data sectors and servo sectors may be patterned using self-assembly. In one embodiment, self-assembly is used to form a first array of islands and a second array of islands in servo sectors that are track-wise offset. A servo writing process is then performed to write a desired servo pattern in the arrays, such as for burst fields, synchronization fields, etc.03-25-2010
20100033872PATTERNED MEDIA BITS WITH CLADDING SHELL - A bit patterned media (BPM) includes many magnetic dots arranged in tracks on a substrate. The magnetic dots each have a hard magnetic core, a soft magnetic cladding surrounding the core and a thin non-magnetic layer that separates the hard magnetic core from the soft magnetic ring. The soft magnetic cladding stabilizes the magnetization at the edges of the hard magnetic core to improve the signal to noise ratio of the magnetic dots. The soft magnetic rings also narrow the magnetic field of the dots which reduces the space requirements and allows more dots to be placed on the substrate.02-11-2010
20100110588Perpendicular Magnetic Recording Medium - According to one embodiment, a perpendicular magnetic recording medium includes a soft magnetic underlayer having an amorphous structure or a microcrystalline structure, a first seed layer comprised of a magnetic material having an fcc crystal structure including a CoFe alloy formed on a substrate side, and a second seed layer formed on the first seed layer, the second seed layer comprised of a nonmagnetic material having an fcc crystal structure including a NiW alloy. The medium also includes an intermediate layer comprised of Ru or an alloy thereof, a magnetic recording layer, and a protective layer, wherein the layers are sequentially stacked on a substrate in the foregoing order and the protective layer is closer to the substrate than the soft magnetic underlayer. Other embodiments of magnetic recording media, and methods of fabrication, are also described.05-06-2010
20090154017SYSTEM, METHOD AND APPARATUS FOR PATTERNED MEDIA WITH REDUCED MAGNETIC TRENCH MATERIAL - A bit patterned magnetic media design for reducing the amount of magnetic material located in the trenches between topographic features is disclosed. An intermediate non-magnetic layer is deposited on the topography prior to depositing the functional magnetic layer on the topographic substrate features. The non-magnetic layer increases the width of the land regions that will ultimately support the functional magnetic layer. The non-magnetic layer also reduces the amount of trench deposition that can occur in the subsequent deposition of the magnetic recording layer. By eliminating most of the magnetic trench material, the amount of magnetic flux and readback interference produced by the trench material is reduced to an acceptable level.06-18-2009
20100020441METHOD AND MANUFACTURE PROCESS FOR EXCHANGE DECOUPLED FIRST MAGNETIC LAYER - A perpendicular magnetic recording medium having a dual-layer magnetic film is disclosed. The bottom layer is completely exchange decoupled, and the top layer contains a certain amount of exchange coupling optimized for recording performance. Preferably, the bottom magnetic layer contains stable oxide material (for example, TiO01-28-2010
20100328818MAGNETIC RECORDING MEDIUM FOR PERPENDICULAR MAGNETIC RECORDING - A perpendicular recording medium having a perpendicular magnetic recording layer and a magnetically soft underlayer structure disposed beneath the recording layer. The soft underlayer structure includes at least first and second soft magnetic layers having different magnetic permeabilities to create a magnetic permeability gradient in the soft underlayer structure. One or more of the soft magnetic layers can be anti-parallel coupled. The soft underlayer structure of the present invention having a magnetic permeability gradient advantageously leads to reduced adjacent track erasure (ATE) while maintaining good overwrite (OW) properties.12-30-2010
20130070370Planarization Method for Media - A planarization process may planarize a media disk that has data trenches between data features and larger servo trenches between servo features. A filler material layer is deposited on the media disk and provides step coverage of the trenches. The filler material has data recesses over the data trenches and servo recesses over the servo trenches that must be removed to produce a planar media surface. A first planarization process is used to remove the data recesses and a second planarization process is used to remove the servo recesses.03-21-2013
20080316651REDUCING UV PROCESS TIME ON STORAGE MEDIA - A perfluoropolyether hard disk lubricant having a UV curable functional end group that may be UV cured at a rapid rate with a Xenon excimer lamp. The perfluoropolyether preferably has at least one UV curable functional end group. In one embodiment, the UV curable end group comprises an acrylate.12-25-2008
20090067092Magnetic recording medium, magnetic recording and reproducing apparatus, and method for manufacturing magnetic recording medium - The magnetic recording medium includes: a recording layer formed over a substrate in a predetermined concavo-convex pattern, convex portions of the concavo-convex pattern constituting recording elements; a filler underlayer film formed on the bottoms of concave portions of the concavo-convex pattern; and a DLC filler formed on the filler underlayer film in contact with the filler underlayer film so as to fill the concave portions. The filler underlayer film is made of a material selected from the group consisting of a Si-containing material, a Ge-containing material, and a carbide material containing one or more metal elements selected from Ti, Ta, Nb, Mo, Zr, Cr, W, V, and Hf.03-12-2009
20130163118RECORDING MEDIUM WITH THIN STABILIZATION LAYER HAVING HIGH MAGNETIC SATURATION AND ANISOTROPIC FIELD CHARACTERISTICS - A perpendicular recording medium with enhanced magnetic stability. In accordance with some embodiments, a multi-layer recording structure is formed on a base substrate and adapted to magnetically store a magnetic bit sequence in domains substantially perpendicular to said layers. A thin magnetic stabilization layer is formed on the multi-layer recording substrate to magnetically stabilize an upper portion of the recording structure.06-27-2013
20100067145SERVO PATTERNS FOR BIT PATTERNED MEDIA WITH MULTIPLE DOTS PER SERVO PERIOD - A servo control field on a recordable medium includes a bit patterned media (BPM) pattern including a plurality of dots arranged in a down-track orientation and in a cross-track orientation, wherein the dots comprise a plurality of dot composites. Each of the dot composites includes a plurality of dots. A first spacing between adjacent ones of the plurality of dots in a dot composite in the down-track direction on the recordable medium is less than a second spacing between adjacent ones of the plurality of dot composites in the down-track direction. A readback signal generated in response to the BPM patterned may be filtered to attenuate harmonic frequencies in the readback signal.03-18-2010
20100226042MAGNETIC DISK SUBSTRATE - NG surface information obtained in a defect inspecting step of a magnetic disk substrate is depicted on the magnetic disc substrate, so that the information can be discriminated at a succeeding film depositing step.09-09-2010
20110299194METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM, AND MAGNETIC RECORDING MEDIUM - [Problem] The concentration distribution in a perpendicular direction of ions implanted in a magnetic recording layer of a perpendicular magnetic recording medium is made a suitable one corresponding to a layer implanted with ions.12-08-2011
20090147403Perpendicular magnetic recording medium and magnetic recording system - Embodiments in accordance with the present invention provide a perpendicular magnetic recording medium where the signal to noise (S/N) of the media is improved. In a particular embodiment, a magnetic layer is applied to the recording magnetic layer of the recording medium in which the normalization crystal grain cluster size (Dn) is controlled so as to satisfy 1≦Dn≦1.9, where the mean value of the recording crystal grain cluster area obtained by summation of the area of neighboring grains having the same crystal orientation in both the a-axis and the c-axis of the recording layer crystal grain of the magnetic layer is normalized by the mean grain size.06-11-2009
20110292546TIMING TRACK FOR MASTER TEMPLATE SUBSTRATE - A patterned recording media is formed from a master template that includes a data area and a timing track area having a final timing track. In order to form the final timing track, a first timing track is etched into master template and tested for accuracy by comparing the angular position of the master template to the timing track. If errors are detected in the timing track, the errors are used to create additional timing tracks which are etched into the master template. This process of improving the timing track is repeated until a final timing track is formed that has errors below a predetermined level. The timing tracks formed prior to the final timing track are removed and the master template is used to make stampers which are used to make patterned media disks.12-01-2011
20100103559MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING SAME - A method of manufacturing a magnetic recording medium is disclosed, as well as a magnetic recording medium manufactured by the method. In the manufacturing method, the uneven pattern has magnetic recording elements in protruding portions formed above a substrate, and depressed portions between the recording elements are filled with a filling material. The method allows a high quality magnetic recording medium to be manufactured inexpensively by eliminating the process of removing excess filling material used to fill depressions between magnetic recording elements, because the method allows material to be filled only in the depressed portions of an uneven pattern. The method includes a technique rendering the wettability of the protruding portion surfaces and the depressed portion surfaces different prior to the process of filling with the filling material.04-29-2010
20080310052Apparatus and method for a ferroelectric disk and ferroelectric disk drive - A ferroelectric disk is disclosed including disk surfaces and an electrode coupling formed on at least one of the disk surfaces and electrically coupled to an electrode sheet covered by a probe surface. A slider is disclosed including a resistive probe and an electrical coupling. A head gimbal assembly, head stack assembly and ferroelectric disk drive are disclosed including the slider. The ferroelectric disk drive is disclosed including at least one of the ferroelectric disks. Access operations for a track on the disk surface of a ferroelectric disk are disclosed.12-18-2008
20100033873MAGNETIC RECORDING MEDIUM, METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING REPRODUCING APPARATUS - In a perpendicular magnetic recording medium in which at least a soft magnetic underlayer, an orientation control layer, a magnetic recording layer and a protective layer are formed on a non-magnetic substrate in order from the bottom, the orientation control layer has a laminated structure of two or more layers including an intermediate layer and a seed layer which is disposed closer to the non-magnetic substrate than the intermediate layer. The seed layer includes two or more kinds of elements having a face-centered cubic structure, has face-centered cubic (111) plane crystals oriented in a direction perpendicular to a substrate surface, and has a pseudo-hexagonal structure.02-11-2010
20090168244Magnetic recording medium, magnetic recording and reproducing apparatus, and method for manufacturing magnetic recording medium - The magnetic recording medium includes: a substrate; a recording layer formed in a predetermined concavo-convex pattern over the substrate, the concavo-convex pattern including a convex portion that serves as a recording element; and a filling portion that fills a concave portion between the recording elements. The filling portion comprises a metal-based main filling material and nitrogen. Nitrogen is unevenly distributed in the filling portion such that the ratio of the number of nitrogen atoms to the total number of atoms of the main filling material and nitrogen atoms is greater in the upper surface portion of the filling portion than in the lower portion thereof.07-02-2009
20100110589HIGH CAPACITY DISK DRIVE USING THIN FOIL DISKS AT ELEVATED ROTATIONAL SPEEDS - A data storage device uses a foil disk platter with significantly reduced inertia and weight as compared to the thick aluminum or glass disk platter in a typical hard disk drive. The reduced rotating inertia of the foil disk enables faster spin-up performance which can be used to reduce decrease the power consumed by the unit. In portable appliances that use disk drive storage devices battery life can be extended significantly and the unit can be made thinner and lighter. Certain parameters of the foil disk substrate may be determined, to provide improved control of disk flutter, from a range parameter defined by05-06-2010
20110109994SUBSTRATE FOR MAGNETIC DISK AND MAGNETIC DISK - The shape and number of surface defects are controlled so that the occurrence of failure is suppressed in an HDD device in which a magnetic head with a very small flying height, such as a DFH head, is mounted.05-12-2011
20090128958MASTER CARRIER FOR MAGNETIC TRANSFER AND MAGNETIC RECORDING MEDIUM MANUFACTURED USING THE SAME - A magnetic transfer master substrate for transferring magnetic information thereof to a perpendicular recording magnetic recording medium in contact therewith under application of a magnetic field comprises a transfer surface area with a magnetic layer formed thereon in a pattern according to the magnetic information to be transferred to the perpendicular magnetic recording medium and a non-transfer surface area laying below said transfer surface area, wherein the magnetic layer has a perpendicular magnetic anisotropy of an anisotropy energy higher than 4×1005-21-2009
20080285174Magnetic recording medium and magnetic storage device - A magnetic recording medium includes: a substrate; a recording layer that is formed on the substrate to have a grooved pattern; and a protection layer formed on the recording layer to fill in the grooved pattern, wherein the recording layer is defined to have a servo portion that retains servo data and a recording track portion that retains recording data, and wherein a first film thickness of the protection layer at the servo portion is larger than a second film thickness of the protection layer at the recording track portion by a thickness that is in a range from 1 nm to 10 nm.11-20-2008
20080291573Magnetic Recording Medium, and Manufacturing Method, Manufacturing Apparatus, Recording and Reproduction Method, and Recording and Reproduction Apparatus for the Same - With a magnetic recording medium, servo pits have to be recorded one disk at a time, which is a problem in that it takes more time and is more expensive. In view of this, with the present invention, at least one signal region whose surface roughness is different from that of other than the signal region is formed on the substrate of a magnetic recording medium comprising a recording layer on a substrate, or on an under layer formed on a substrate.11-27-2008
20100118441METHOD FOR MANUFACTURING MAGNETIC RECORDING MEDIUM, AND MAGNETIC RECORDING AND REPRODUCING APPARATUS - There is provided a method for manufacturing a magnetic recording medium which can easily produce a magnetic recording medium, the magnetic recording medium having a plurality of magnetically separated recording layers suitable as the recording layers in a discrete track medium or patterned medium, and also having excellent surface flatness, in which spaces between the adjacent recording layers are filled in with a non-magnetic material.05-13-2010
20100195249Method of manufacturing a magnetic recording medium and a magnetic recording medium manufactured by the method - A method of manufacturing a magnetic recording medium includes forming an electrically conductive intermediate layer over a non-magnetic substrate; forming an aluminum-containing layer on the intermediate layer; forming a plurality of micro pits in the aluminum-containing layer; generating an alumina-containing layer by oxidizing the aluminum-containing layer and simultaneously forming nano holes in the alumina-containing layer originating from the micro pits to expose the intermediate layer; cleaning and drying the nano holes using a sub- and super-critical fluid; and depositing a magnetic metal selectively on the intermediate layer to form a magnetic recording layer having a plurality of magnetic recording elements. The method thus employs alumina nano holes (ANHs) to fill magnetic metal uniformly and selectively even for ANHs with a diameter not larger than 25 nm.08-05-2010
20090296278PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE APPARATUS - A perpendicular magnetic recording medium includes a nonmagnetic seed layer, a nonmagnetic intermediate layer provided on the nonmagnetic seed layer, and a perpendicular recording layer provided on the nonmagnetic intermediate layer. The nonmagnetic seed layer includes a first seed layer made of an amorphous material, and a second seed layer provided between the first seed layer and the nonmagnetic intermediate layer and made of a material having a fcc structure. The amorphous material includes at least one element selected from a group consisting of Ta, W, Nb, Mo, Zr and alloys thereof which include at least one of Ta, W, Nb, Mo and Zr as a main component exceeding 50 at. %.12-03-2009
20090296280MASTER RECORDING MEDIUM HAVING IMPROVED MAGNETIC TRANSFER PERFORMANCE - Provided is a master recording medium suitable for use in magnetic transfer of a servo pattern onto a magnetic recording medium. The master recording medium includes a substrate including a plurality of servo regions and a plurality of data regions, and a magnetic layer formed on each of the servo regions and patterned in the shape of a servo pattern to be patterned on a magnetic recording medium, wherein the servo regions protrude relative to the data regions.12-03-2009
20090296279MAGNETIC RECORDING MEDIUM AND INFORMATION RECORDING DEVICE - A magnetic recording medium including: a substrate; plural information recording members that are formed of a hard magnetic material on the substrate, in each of which magnetization in a direction crossing the substrate is generated and, when the information recording members pass in a predetermined traveling direction in a magnetic field for information recording, the magnetization is directed to a direction corresponding to a direction of the magnetic field and information is recorded; and a high-permeability film that is placed on an edge on a front side of the information recording members in the traveling direction and has a magnetic permeability higher than a magnetic permeability of the information recording members.12-03-2009
20080212233Method of manufacturing storage medium apparatus and storage medium apparatus - A method of manufacturing a storage medium apparatus having a storage medium that stores data. The method includes disposing the storage medium onto a first unit having an insertion section to be inserted into a through hole of the storage medium and an abutment face made of a soft-metal material and spreading around the insertion section, such that the abutment face abuts a surface of the storage medium. The method further includes: abutting an abutment face of a second unit, made of a soft-metal material, on a surface of the storage medium opposite to the surface abutting the abutment face of the first unit; and while holding the storage medium between the first unit and the second unit, fixing the storage medium and at least one of the first unit and the second unit by rotating the storage medium and the one relatively to each other about the through hole.09-04-2008
20110199706PRODUCTION METHOD OF DISK DRIVE DEVICE FOR CLEANING SUBASSEMBLIES AND DISK DRIVE DEVICE PRODUCED BY SAID PRODUCTION METHOD - A production method of a disk drive device includes: an assembling process of assembling a subassembly by incorporating at least a bearing unit in a hub in a clean room; a pouring process of pouring a lubricant in the bearing unit; a cleaning-liquid discharging process of discharging a cleaning liquid to the hub; a cleaning-liquid intake process of taking in the cleaning liquid discharged to the hub; and a sealing process of sealing the subassembly in a seal-material.08-18-2011
20100061018MAGNETIC RECORDING DISK DRIVE WITH PATTERNED MEDIA AND OPTICAL SYSTEM FOR CLOCKING WRITE DATA - A patterned-media magnetic recording disk drive uses an optical system for accurately clocking the write data. The disk has concentric data tracks patterned into discrete magnetizable data islands with nonmagnetic spaces between the islands. As the disk rotates, a radiation source directs near-field radiation to the islands and spaces, and a radiation detector receives reflected radiation. The radiation is directed from the source through an optical channel or waveguide on the air-bearing slider that supports the read and write heads. The optical channel or waveguide has a near-field transducer at the disk-facing surface of the slider where the near-field radiation exits and reflected radiation returns. The reflected optical power varies depending on whether the near-field transducer couples to an island or a space, so the radiation detector output signal represents the frequency and phase of the islands as the disk rotates. The write clock that controls write pulses to the write head is responsive to the radiation detector output signal, so the frequency and phase of the write clock signal can be matched to the frequency and phase of the islands as the disk rotates.03-11-2010
20080239570SPINDLE MOTOR AND DISK-SHAPED MEDIUM RECORDING AND REPRODUCING DEVICE - A spindle motor can suppress the generation of noise during swinging and the extend service life, and also suppress the increase in current consumption. The outside diameter Do of a thrust hydrodynamic groove 10-02-2008
20090168245INFORMATION RECORDING MEDIUM, RECORDING/REPRODUCING APPARATUS, AND STAMPER - Data track patterns and servo patterns are formed on an information recording medium by concave/convex patterns divided into ring-shaped regions that are concentric with the data track patterns. In the servo patterns, a unit convex length and a unit concave length along the direction of rotation increase in each ring-shaped region from an inside to an outside of the ring-shaped region in proportion to the distance from the center of the data track patterns and a value produced by dividing an average unit convex (or concave) length inside each ring-shaped region by a distance from the center to the ring-shaped region decreases toward the outer periphery of the medium. The ring-shaped regions include plural first regions between an innermost region and an outermost region. Respective lengths along a radial direction of the first regions increase toward an outer periphery of the medium.07-02-2009
20080310053MAGNETIC RECORDING MEDIUM, METHOD OF RECORDING SERVO PATTERN ON MAGNETIC RECORDING MEDIUM, AND MAGNETIC HEAD - A magnetic recording medium includes a disk substrate and a magnetic recording layer formed on one surface or both surfaces of the disk substrate. The magnetic recording layer includes at least one pattern area forming a plurality of data tracks in which a position for magnetic recording is patterned with a magnetic body and at least one continuous area formed of a continuous magnetic body, and at least a part of a servo pattern for following the data track is recorded in the continuous area. A method of recording a servo pattern on a magnetic recording medium includes determining a center position of the data track and a start position of the continuous area and recording a servo pattern for following the data track in the continuous area with respect to center position of the data track and the start position of the continuous area. A magnetic head for recording a servo pattern on a magnetic recording medium includes a data writing head for recording data, a servo writing head for recording the servo pattern, and a reading head for reproducing the data.12-18-2008
20090052083MAGNETIC RECORDING MEDIUM AND PRODUCTION METHOD THEREOF - A method for producing a magnetic recording medium, including depositing an imprint resist layer on a magnetic layer containing a ferromagnetic material and a first non-magnetic material, on a substrate, transferring a concavo-convex pattern onto the imprint resist layer by pressing against the imprint resist layer an imprint mold structure having convex portions so as to have concavo-convex portions, forming magnetic pattern portions corresponding to the concavo-convex pattern by etching the magnetic layer using the imprint resist layer as a mask, and forming non-magnetic pattern portions by embedding a second non-magnetic material in concave portions, wherein the magnetic layer is etched so as to remove the ferromagnetic material in the magnetic layer, and leave 5% by mass or more of the first non-magnetic material in each concave portion relative to the total mass of the first non-magnetic material in each region corresponding to the concave portions to be formed.02-26-2009
20100142091INFORMATION RECORDING/REPRODUCING DEVICE - An information recording/reproducing device includes a recording layer, and a recording circuit which records data to the recording layer by generating a phase change in the recording layer. The recording layer includes a first chemical compound having a spinel structure. The recording layer is A06-10-2010
20110205668MAGNETIC RECORDING MEDIUM AND MANUFACTURING METHOD THEREOF - A magnetic recording medium comprises a data region for recording data and a servo region that is disposed adjacent to the data region and has recorded information for controlling a magnetic head. The data region has a pattern of dots separated from each other by grooves or nonmagnetic material. The servo region lacks the pattern of dots, and includes magnetic information written in a flat region. The magnetic recording medium can be formed by a method that does not need a separate process of writing servo information.08-25-2011
20090141399MAGNETIC RECORDING MEDIUM, METHOD FOR PRODUCING THEREOF, AND MAGNETIC RECORDING AND REPRODUCING APPARATUS - A magnetic-recording medium which is provided on a nonmagnetic substrate with at least an orientation-controlling layer for controlling the orientation of a layer formed directly thereon, a perpendicularly magnetic layer having an easily magnetizing axis oriented mainly perpendicularly relative to the nonmagnetic substrate, and a protective layer. The perpendicularly magnetic layer includes two or more magnetic layers, at least one of the magnetic layers is a layer having Co as a main component and containing Pt as well and containing an oxide, and at least another of the magnetic layers is a layer having Co as a main component and containing Cr as well and containing no oxide.06-04-2009
20090128957Connecting apparatus adapted in a conjunctive structure - A connecting apparatus adapted in a conjunctive structure is provided. The conjunctive structure comprises a baseboard, a peripheral element and a connecting apparatus. The connecting apparatus comprises at least one first connecting element and at least one second connecting element. The first connecting element is a magnetic element and is placed on one corner of the peripheral element. The second connecting element is placed around a hole of the baseboard, and the second connecting element comprises two adjacent magnetic elements with opposite polarity arrangement.05-21-2009
20090257148MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING DEVICE - There is provided a magnetic recording medium which contains a substrate in the shape of a disk, and a plural of recording bit formed on the substrate, wherein a bottom face of the recording bit is disposed so as to face the substrate, a top face of the recording bit is disposed so as to correspond to the bottom face of the recording bit, and Twb is larger than Twt, where Twb indicates a width of the bottom face with respect to a radius direction of the magnetic recording medium, and Twt indicates a width of the top face with respect to the radius direction.10-15-2009
20090086372Perpendicular magnetic recording medium, method of manufacturing the same, and magnetic recording device - Embodiments of the present invention help to provide a discrete track medium for realizing a high track density in a low price by adopting a configuration, in which filling of a non-magnetic material into a guard band portion and smoothing processing of a medium surface are not required. According to one embodiment, a perpendicular magnetic recording medium, on the non-magnetic substrate, includes at least: a soft magnetic underlayer; a first recording layer including a crystal grain having a magnetic property and a non-magnetic grain boundary having an oxide, as a main component, surrounding the crystal grain; a second recording layer containing a ferromagnetic metal as a main component and not containing an oxide; and at least one non-magnetic layer provided between the first recording layer and the second recording layer. A recording track portion for magnetically recording information and a guard band portion provided between adjacent recording track portions are included in the perpendicular magnetic recording medium. The relationship between the total thickness t04-02-2009
20090097160MAGNETIC RECORDING DISK AND DISK DRIVE WITH AMPLITUDE-TYPE SERVO FIELDS HAVING PATTERNED SERVO ISLANDS FOR READ/WRITE HEAD POSITIONING - A magnetic recording disk drive has a disk with pre-patterned nondata servo sectors extending generally radially across the data tracks. The disk may be a patterned-media disk with both pre-patterned data islands and pre-patterned nondata servo sectors. The servo sectors include a synchronization pattern of generally radially directed discrete magnetized marks, and first and second position error signal (PES) fields of generally radially directed discrete magnetized stripes. Each stripe in each of the two fields comprises a plurality of radially spaced discrete servo islands, each island having a radial height of approximately Tp, where Tp is the radial spacing of the track centerlines. In each field, the servo islands in alternating stripes in the along-the-track direction are shifted radially by approximately Tp. In the first PES field, the islands are centered at the midline between two adjacent track centerlines, and in the second PES field the islands are centered at a track centerline. All of the servo islands in the two PES fields have the same magnetization direction.04-16-2009
20110141621PERPENDICULAR MAGNETIC RECORDING MEDIA WITH OXIDE-CONTAINING EXCHANGE COUPLING LAYER - A magnetic storage medium according to one embodiment includes a substrate; a first oxide magnetic layer formed above the substrate; a second oxide magnetic layer formed above the first oxide magnetic layer; an exchange coupling layer formed above the second oxide magnetic layer, the exchange coupling layer comprising an oxide; and a magnetic cap layer formed above the exchange coupling layer. A method according to one embodiment includes forming a high Ku first oxide magnetic layer above a substrate by sputtering; forming a low Ku second oxide magnetic layer above the first oxide magnetic layer by sputtering; forming an exchange coupling layer of CoCrPt-oxide above the second oxide magnetic layer; and forming a magnetic cap layer above the exchange coupling layer. Additional systems and methods are also presented.06-16-2011
20110141620SHALLOW TRENCH DISCRETE TRACK MEDIA (DTM) AND PATTERN TRANSFER PROCESS - A shallow trench discrete track media structure is fabricated by etching a magnetic recording layer to provide a plurality of discrete magnetic data tracks separated by shallow trenches. Each shallow trench has a trench floor formed at a depth in the magnetic recording layer that is less than the thickness of the magnetic recording layer. Exposed regions of the magnetic recording layer beneath the trench floor are reacted with reactive plasma to diminish the magnetic moment of the exposed regions.06-16-2011
20090244775ADJACENT-TRACK-ERASURE (ATE) REFRESH WITH INCREASED TRACK RESOLUTION FOR OFTEN-WRITTEN AREAS - Methods and systems are shown that specify using group counters and track counters to reduce the need for adjacent-track-erasure (ATE) refresh. A group threshold may be used to monitor the number of write operations to a group. The group threshold may be used to determine when it is necessary to monitor the write operations to the tracks in a group on an individual basis.10-01-2009
20100165508MAGNETIC LAYERING FOR BIT-PATTERNED MEDIA - A perpendicular magnetic recording layer of a magnetic recording medium includes a plurality of bit-patterned magnetic islands, wherein each of the plurality of islands overlay a soft magnetic under-layer. Each of the magnetic islands includes a first magnetic sub-layer adjacent a second magnetic sub-layer, wherein the first sub-layer has a relatively high magnetic anisotropy that is greater than a magnetic anisotropy of the second sub-layer. The magnetic recording layer further includes a third sub-layer, which extends to connect each of the plurality of islands. The third sub-layer may have a magnetic anisotropy that is less than that of the second sub-layer of each of the magnetic islands and/or may serve as an interlayer, extending between the first sub-layer and the soft magnetic under-layer of the recording medium, and having a structure to help to produce the greater anisotropy first magnetic sub-layer.07-01-2010
20090244776MAGNETIC TRANSFER MASTER CARRIER AND MAGNETIC RECORDING MEDIUM - To provide a magnetic transfer master carrier including a base material, a concavo-convex pattern formed by arranging a plurality of convex portions on a surface of the base material, and a magnetic layer provided at least on upper surfaces of the convex portions, wherein the magnetic layer is formed by an ion gun deposition method in which a target material is irradiated with an ion beam and a layer is deposited with sputter particles sputtered from the target material.10-01-2009
20100046118TIME-SHIFTED BITS FOR WRITE SYNCHRONIZATION CORRECTION - Systems and methods are provided for correcting write synchronization of a magnetic storage device with respect to magnetic storage media and its corresponding writable magnetic bits, or dots. In particular, these systems and methods involve using time-shifting principles to calibrate the magnetic storage devices to correct slow drifts of reader-writer timing. It is to be appreciated that time-shifting techniques can be applied in a variety of manners. For example, the very dots on the media can be positioned in time-shifted fashion. In another example, the writing to the dots can be time-shifted.02-25-2010
20100177439PERPENDICULAR MEDIA WITH REDUCED SIDE TRACK ERASURE - A media for perpendicular recording and a method of creating the media is provided. The media includes a hard recording layer and a soft underlayer (SUL). The SUL is composed of at least two anti-ferromagnetically coupled (AFC) sub-underlayers. The sub-underlayers respond to a magnetic field established during dynamic reversal with respective magnetic fields. The sub-underlayers are formed and disposed to differ in one or more magnetic moment, anisotropy, and thickness, so that their respective magnetic fields constructively interfere in one or more points in the hard recording layer, thereby reducing a total SUL magnetic field response to the dynamic reversal field approximately to zero at one or more points in the hard recording layer, which reduces side track erasure.07-15-2010
20090116147PERPENDICULAR MAGNETIC RECORDING DISK HAVING A PERMEABILITY GRADIENT - Perpendicular magnetic recording disks and methods of fabricating perpendicular magnetic recording disks are described. The perpendicular magnetic recording disk includes a soft magnetic uniderlayer (SUL) structure, an interlayer, and a perpendicular magnetic recording layer. The SUL structure has an increased permeability from an inner radius of the disk to an outer radius of the disk. As a result, the magnetic write width (MWW) on the tracks of the disk is substantially uniform throughout the disk.05-07-2009
20110235212METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM - According to one embodiment, a method of manufacturing a magnetic recording medium includes forming on a magnetic recording layer a first hard mask, a second hard mask, a third hard mask and a resist, imprinting the resist with a stamper, removing a residue left in the recesses of the patterned resist, etching the third hard mask by use of the patterned resist as a mask, etching the second hard mask by use of the third hard mask as a mask, etching the first hard mask by use of the second hard mask as a mask, forming a pattern of the magnetic recording layer with ion beam irradiation, and removing the first hard mask by use of a remover liquid with higher reactivity to the metal material of the first hard mask than to a constituent element of the magnetic recording layer.09-29-2011
20080297947Magnetic Disk for Hard Disk Drives - The present invention provides a magnetic disk in a discrete track medium and a patterned medium, which prevents the loss of the magnetically recorded data when a head of a magnetic disk device contacts the magnetic disk, and a manufacturing method thereof. A magnetic disk has a protrusion as a non-magnetic member formed on a disk surface to prevent a head from being in contact with a recording section. When the protrusion formed in a disk substrate collides against the head, the protrusion 12-04-2008
20090213497Magnetic recording medium and manufacturing method thereof - Embodiments of the present invention provide recording area separated magnetic recording media (DTMs, BPMs) allowing magnetic heads to fly lower. According to one embodiment, the recording area separated magnetic recording media are configured so that magnetic recording layers have parts with the relatively higher element ratio of a ferromagnetic material, and parts with the lower element ratio of the ferromagnetic material, occurring periodically in the in-plane direction, and the average height from the substrate surface of the parts with the relatively higher element ratio of a ferromagnetic material is higher than the average height from the substrate surface of the parts with the lower element ratio of the ferromagnetic material. In producing recording area separated magnetic recording media with the element ratio of a ferromagnetic material relatively lowered by ion implantation, preliminarily etching the part to be ion implanted makes the height after ion implantation relatively lower than the non-implanted part.08-27-2009
20090067091Process for filling a patterned media of a hard disk with UV-cured lubricant - A patterned disk for a hard disk drive. The patterned disk includes a magnetic material over a substrate. The magnetic material includes a plurality of grooves. The grooves are filled with a lubricant that is hardened with UV exposure or some other hardening process. The lubricant provides a protective cover for the magnetic material exposed by the grooves. The use of lubricants in the fabrication of disks is known, thus the process does not introduce a process step that requires special equipment and/or process development.03-12-2009
20110026162MAGNETIC DISK AND METHOD OF MANUFACTURING THE SAME - Provided is a magnetic disk that is excellent in durability, particularly in LUL durability and CFT properties, and thus has high reliability despite the low flying height of a magnetic head following the rapid increase in recording density in recent years and despite the very strict environmental resistance following the diversification of applications. A magnetic disk (02-03-2011
20100172055Three Dimensional Magnetic Memory and/or Recording Device - An electronic memory and/or recording device includes a three dimensional magnetic medium. Three dimensional magnetic medium includes a plurality of magnetic sublayers, each of the magnetic sublayers being separated from one other by non-magnetic interlayers.07-08-2010
20090034124IMPRINT MOLD STRUCTURE, METHOD FOR PRODUCING MAGNETIC RECORDING MEDIUM, AND MAGNETIC RECORDING MEDIUM - An imprint mold structure of the present invention is for producing a magnetic recording medium having servo areas each of which has a preamble area where servo data for synchronization with a clock cycle is recorded, and data areas where user data is written, and contains a first convexo-concave pattern corresponding to the servo areas and a second convexo-concave pattern corresponding to the data areas, wherein a ratio L/S of a width “L” in the circumferential direction of a convex portion corresponding to a non-magnetic portion formed in the preamble area to a width “S” in the circumferential direction of a concave portion corresponding to a magnetic portion formed in the preamble area varies depending on a distance “R” from a center of the imprint mold structure to a center of a pattern unit composed of the convex portion and the concave portion in the first convexo-concave pattern.02-05-2009
20090034123INFORMATION RECORDING AND REPRODUCING APPARATUS - There is proposed a nonvolatile information recording and reproducing device with low power consumption and high thermal stability. The information recording and reproducing apparatus according to an aspect of the present invention includes a recording layer and a unit for recording information by applying a voltage to the recording layer to generate a state change in the recording layer. The recording layer being configured to include at least a first compound having a hollandite structure.02-05-2009
20100014192MAGNETIC RECORDING MEDIUM, MANUFACTURING METHOD THEREFOR, AND MAGNETIC RECORDING/REPRODUCING APPARATUS - A magnetic recording medium, a manufacturing method thereof, and a magnetic recording/reproducing apparatus are provided, capable, with a configuration having a magnetic recording film only on one side, of suppressing warp occurrence, and obtaining a high quality and thin-type magnetic recording medium. When forming a recording layer having at least a magnetic recording film on one main surface of a substrate by means of a vapor-phase film forming method, a thin film is formed on the other main surface of the substrate using a vapor-phase film forming method. When the recording layer is formed as a multiple layer structure, the thin film is also formed as a multiple layer structure with the same number of laminations as for the recording layer 01-21-2010
20090310256METHOD FOR MAKING A MASTER MOLD WITH HIGH BIT-ASPECT-RATIO FOR NANOIMPRINTING PATTERNED MAGNETIC RECORDING DISKS, MASTER MOLD MADE BY THE METHOD, AND DISK IMPRINTED BY THE MASTER MOLD - A method for making a master mold to be used for nanoimprinting patterned-media magnetic recording disks results in a master mold having topographic pillars arranged in a pattern of annular bands of concentric rings. The ratio of circumferential density of the pillars to the radial density of the concentric rings in a band is greater than 1. The method uses sidewall lithography to first form a pattern of generally radially-directed pairs of parallel lines on the master mold substrate, with the lines being grouped into annular zones or bands. The sidewall lithography process can be repeated, resulting in a doubling of the number of lines each time the process is repeated. Conventional lithography is used to form concentric rings over the radially-directed pairs of parallel lines. After etching and resist removal, the master mold has pillars arranged in circular rings, with the rings grouped into annular bands. The master mold may be used to nanoimprint the disks, resulting in disks having a BAR greater than 1, wherein BAR is the ratio of data track spacing in the radial direction to the data island spacing in the circumferential direction.12-17-2009
20080204935ORIGINAL DISK FABRICATION METHOD, MAGNETIC RECORDING MEDIUM MANUFACTURING METHOD AND MAGNETIC RECORDING MEDIUM - It is made possible to fabricate a bit-patterned magnetic recording medium having a high recording density and making favorable address deciphering possible. An original disk fabrication method for irradiating a photosensitive resin film with an electron beam to draw a pattern, the method includes: irradiating the electron beam by using a plurality of blanking signals every rotation of a stage per bit unit, when drawing the pattern in a part corresponding to an address part on a photosensitive resin film.08-28-2008
20080204934Magnetic recording medium, method for manufacturing the same, and magnetic recording/reproducing apparatus - There is provided a method for fabricating a magnetic recording medium that provides high throughput, low manufacturing cost, and no degradation in accuracy in pattern size in fine pattern formation. A resist layer is formed on a substrate or cutting work layer. The surface of the substrate is divided into two or more areas using the center of rotation of the substrate as a reference point. An optical, contactless pattern transfer method is used to transfer a figure pattern contained in the divided area through a mask to the resist layer so as to form a latent image of the figure pattern. The pattern transfer is similarly carried out for the divided area. After the pattern transfer processes for all the divided areas are completed, the entire resist layer is developed to form a resist pattern. The resist pattern is used as a mask to cut the substrate or cutting work layer. As a result, there is provided the substrate or cut work layer onto which a fine pattern has been transferred.08-28-2008
20110255193Magnetic recording medium and method of manufacturing the same - According to one embodiment, a magnetic recording medium includes a data region and a servo region adjacent to the data region and including a magnetic recording layer, the magnetic recording layer including first and second patterned regions adjacent to each other, the first patterned region including a first nonmagnetic matrix and first magnetic particles dispersed in the first nonmagnetic matrix and having magnetization oriented in a first direction, the second patterned region includes a second nonmagnetic matrix and second magnetic particles dispersed in the second nonmagnetic matrix and having magnetization oriented in a second direction opposite to the first direction, sizes of the first magnetic particles being smaller than sizes of the second magnetic particles.10-20-2011
20110002067SINGLE-SIDED STORAGE MEDIA - In one embodiment, a method can include providing first and second intermediate structures, each having first and second surfaces. Also, the method can include placing the first surface of the first intermediate structure adjacent to the first surface of the second intermediate structure, such that the first and second intermediate structures are in a stacked relationship. Additionally, the method can include simultaneously removing at least a portion of each of the second surfaces of the first and second intermediate structures while in the stacked relationship. Furthermore, the method can include forming a plating layer on each of the first and second surfaces of each of the first and second intermediate structures. Moreover, the method can include forming a magnetic layer on the second surface but not the first surface of each of the first and second intermediate structures.01-06-2011
20080204933Granular perpendicular magnetic recording media with multi-interlayer structure - A perpendicular magnetic recording medium comprises a layer stack formed over a surface of a non-magnetic substrate, and comprising, in overlying sequence from the surface: a magnetically soft underlayer; an interlayer structure for crystallographically orienting a layer of a perpendicular magnetic recording material formed thereon; and at least one crystallographically oriented, magnetically hard, perpendicular magnetic recording layer on the interlayer structure; wherein the interlayer structure is a triple-layer stacked structure comprising: a first interlayer of a first non-magnetic material proximal the magnetically soft underlayer and containing Ru; a second interlayer of a second non-magnetic material in overlying contact with the first interlayer and not containing Ru; and a third interlayer of a third non-magnetic material in overlying contact with the second interlayer and containing Ru.08-28-2008
20110164337SUBSTRATE FOR MAGNETIC RECORDING MEDIUM, MAGNETIC RECORDING MEDIUM, AND MAGNETIC RECORDING AND REPRODUCING APPARATUS - In an example magnetic recording medium substrate, a plurality of recording tracks are formed on a substrate, each recording track being formed of a magnetic material. Non-recording sections are formed on the substrate, each non-recording section separating adjacent recording tracks. Each recording track includes a plurality of recording sections and connecting sections for connecting the recording sections adjacent thereto in a track longitudinal direction, and each connecting section has a cross-sectional area in a track width direction that is smaller than a cross-sectional area in a track width direction of adjacent recording sections.07-07-2011
20110164336PATTERNED MEDIA AND FABRICATION METHOD THEREOF - Since the surface roughness of a recording layer get larger in the process of fabricating a patterned medium, the spacing between a head and the medium is widened. As a result, the recording performance and corrosion resistance of the medium are degraded. In the patterned medium, a recording layer includes one layer of a crystalline magnetic film or plural layers of crystalline magnetic films, and a magnetic film of an amorphous structure located on the outermost surface of the crystalline magnetic films. The compositional elements of the magnetic film of the amorphous structure are identical to those of the crystalline magnetic film located immediately under the magnetic film. In a fabrication method thereof, the surface of the crystalline magnetic film is turned into amorphous in order to form the magnetic film of the amorphous structure.07-07-2011
20100302682Magnetic Recording Media Having Recording Regions and Separation Regions That Have Different Lattice Constants and Manufacturing Methods Thereof - According to one embodiment, a magnetic recording medium includes a magnetic recording layer formed above a substrate, the magnetic recording layer being comprised of an alloy having a crystal structure, recording tracks formed on the magnetic recording layer in nearly concentric circular shapes, wherein the recording tracks are comprised of a first alloy composition having a crystal structure, and track separation regions formed between the recording tracks on the magnetic recording layer, wherein the track separation regions are comprised of a second alloy composition having a crystal structure, the second alloy composition comprising the first alloy composition and a non-magnetic element, wherein a lattice constant of the second alloy composition is greater than a lattice constant of the first alloy composition. In other embodiments, methods of manufacturing magnetic recording media and systems using magnetic recording media are described.12-02-2010
20110096437DISK DRIVE DEVICE HAVING A LAMINATED CORE - In A disk drive device, a magnetic recording disk is to be mounted on a hub. A base plate rotatably supports the hub through a bearing unit. A projecting portion is formed on the upper surface of the base plate. The projecting portion has a cylindrical side surface, the center of which being along the rotational axis of the motor. A laminated core is formed by laminating eight magnetic steel sheets and has a ring portion and a plurality of teeth that extend radially from the ring portion. The disk drive device has a tubular vibration-deadening ring. The outer surface of the vibration-deadening ring is press-fitted into the ring portion, and the inner surface is fixed to the side surface of the projecting portion. The outer surface of the vibration-deadening ring is pressed against the ring portion at least at a position closer, in the direction along the rotational axis of the motor, to the upper surface of the laminated core than to the lower surface of the laminated core.04-28-2011
20100214694METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM - According to one embodiment, a method of manufacturing a magnetic recording medium includes forming a first hard mask, a second hard mask and a resist on a magnetic recording layer, imprinting a stamper to the resist to transfer patterns of protrusions and recesses to the resist, removing residues remaining in the recesses of the patterned resist, etching the second hard mask by using the patterned resist as a mask to transfer the patterns of protrusions and recesses to the second hard mask, etching the first hard mask by using the second hard mask as a mask to transfer the patterns of protrusions and recesses to the first hard mask, removing the second hard mask remaining on the protrusions of the first hard mask, and deactivating the magnetic recording layer exposed in the recesses by means of ion beam irradiation.08-26-2010
20100214695METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM - According to one embodiment, a method of manufacturing a magnetic recording medium includes forming a first hard mask, a second hard mask and a resist on a magnetic recording layer, imprinting a stamper to the resist to transfer patterns of protrusions and recesses to the resist, removing residues remaining in the recesses of the patterned resist by means of a first etching gas, etching the second hard mask by means of the first etching gas using the patterned resist as a mask to transfer the patterns to the second hard mask, etching the first hard mask by means of a second etching gas different from the first etching gas using the second hard mask as a mask to transfer the patterns to the first hard mask, and performing ion beam etching in order to deactivate the magnetic recording layer exposed in the recesses and to remove the second hard mask.08-26-2010
20100165510VERTICAL MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING REPRODUCING APPARATUS - A magnetic recording medium comprising a substrate, at least one soft magnetic underlayer formed on the substrate, a perpendicular magnetic recording layer formed on the soft magnetic underlayer, and a protective layer formed on the perpendicular magnetic recording layer, is provided wherein the perpendicular magnetic recording layer is comprised of a primary recording layer, a non-magnetic intermediate layer and an auxiliary layer; the primary recording layer comprises magnetic crystal grains and grain boundary portions surrounding the magnetic crystal grains, and has a perpendicular magnetic anisotropy; the auxiliary layer has a negative magneto crystalline anisotropy; and the non-magnetic intermediate layer is formed between the primary recording layer and the auxiliary layer and comprises at least one metal selected from Ru, Rh and Ir, or at least one alloy thereof. This magnetic recording medium exhibits high heat resistance and good recording/reproducing characteristics, and enables a high recording density.07-01-2010
20100165509PERPENDICULAR MAGNETIC RECORDING MEDIUM - A perpendicular magnetic recording medium, which includes a nonmagnetic substrate, and a soft magnetic layer, a first orientation control layer, a nonmagnetic intermediate layer, and a perpendicular magnetic recording layer formed sequentially on the nonmagnetic substrate. The perpendicular magnetic recording medium further includes a second orientation control layer provided between the first orientation control layer and the nonmagnetic intermediate layer. The nonmagnetic intermediate layer has hexagonal close-packed (hcp) structure. The first orientation control layer has a face-centered cubic (fcc) structure. The second orientation control layer includes Co and Cr, and has the hcp structure.07-01-2010
20100020442One magnetic sided media for low cost and low capacity applications - One-sided magnetic media for a hard disk drive. Methods are implemented to create a magnetic media with only one surface capable of recording data. The second surface is a non-data recording side of the media and is constructed so that it does not interfere with the recording properties of the recording side or the structural usefulness of the media. Additionally, the second surface can be a low quality surface capable of limited magnetic recording.01-28-2010
20090067090NULL SERVO PATTERN FOR BIT-PATTERNED MEDIA - A patterned recording media comprises a segment and a null pattern formed in the segment. The segment comprises first and second rows of discrete magnetic elements separated by a non-magnetic material, and a row of non-magnetic material positioned between the first and second rows. The null pattern comprises consecutive groups of the discrete magnetic elements in the first and second rows of the segment. Each group in the first row has a magnetic polarity that is opposite the magnetic polarity of adjoining groups in the first row. Each group in the second row has a magnetic polarity that is opposite the magnetic polarity of adjoining groups in the second row.03-12-2009
20090195928MAGNETIC DISK APPARATUS - A magnetic disk apparatus includes a non-volatile memory for saving read data and write data transmitted from a host. The magnetic disk apparatus includes a non-volatile memory that saves read data and write data transmitted from a host. The non-volatile memory has a host designated data area that saves host designated data designated by the host, and an independent data area that independently saves data other than the host designated data wherein the independent data area comprises a read data area that saves read data based on a read request command transmitted from the host and a write data area that saves write data based on a write request command.08-06-2009
20110096436PATTERNED MAGNETIC RECORDING DISK WITH PATTERNED SERVO SECTORS AND METHOD USING BLOCK COPOLYMERS FOR MAKING A MASTER MOLD FOR NANOIMPRINTING THE DISK - A patterned-media perpendicular magnetic recording disk has patterned servo regions and is nanoimprinted from a master mold made using directed self-assembly of block copolymers. The disk has patterned concentric circular data tracks of discrete data islands, with the tracks having a track pitch in the radial or cross-track direction. The disk also has patterned servo sectors extending generally radially across the patterned data tracks. The servo pattern is a chevron pattern of slanted or non-radial stripes that have a stripe pitch in the cross-stripe direction substantially equal to the track pitch. As a result of the method of making the master mold, the nanoimprinted disk has a chevron servo pattern with non-radial stripes that are magnetized segments of radial lines separated by nonmagnetic spaces.04-28-2011
20110085267Media Design for High TPI for Write Fringing Reduction - A recording media design having discrete track recording structure where the trenches between tracks are filled with a soft magnetic material is provided. The soft magnetic material provides a low magnetic impedance path to the soft underlayer such that fringe fields from the write head are conducted to the soft underlayer without having a negative effect such as adjacent track erasure. A method of manufacturing the media includes a nano-imprint step and ion milling out the data layer to create the trenches. A B04-14-2011
20110085268MAGNETIC RECORDING MEDIUM, METHOD OF FABRICATING THE SAME, AND MAGNETIC RECORDING APPARATUS - According to one embodiment, there is provided a magnetic recording medium having a data region in which a plurality of recording tracks, each including magnetic dots arrayed in a down-track direction with a pitch p, are formed in a cross-track direction, and a servo region including a preamble in which a plurality of lines of magnetic dots, which are arrayed in a cross-track direction with a pitch p, are formed at equal intervals in the down-track direction.04-14-2011
20120026627MULTI-LAYER STACK ADJACENT TO GRANULAR LAYER - In some embodiments, an article comprising a first magnetic recording layer, the first magnetic recording layer including a granular layer having a first magnetic anisotropy and a multi-layer stack adjacent the granular layer, the multi-layer stack comprising one or more substantially magnetic film layers alternating with one or more polarization conductor layers, wherein the multi-layer stack has a second magnetic anisotropy that is greater than the first magnetic anisotropy.02-02-2012
20120026626APPARATUS INCLUDING A PERPENDICULAR MAGNETIC RECORDING LAYER HAVING A CONVEX MAGNETIC ANISOTROPY PROFILE - An apparatus may include a first magnetic layer, a first exchange break layer formed on the first magnetic layer, a second magnetic layer formed on the first exchange break layer, a second exchange break layer formed on the second magnetic layer, and a third magnetic layer formed on the second exchange break layer. The first magnetic layer has a first magnetic anisotropy energy, H02-02-2012
20100020443Creation of mirror-image patterns by imprint and image tone reversal - Mirror-image patterns for use one patterned media. Methods are implemented to create a mirror-image on the top and bottom of a media disk. These mirror images simplify the creation of electronics for patterned media. Further, the methods allow for a single e-beam master disk to be used to create the stamper for the top and the bottom of the media disk.01-28-2010
20110075297PATTERNED MAGNETIC MEDIA HAVING AN EXCHANGE BRIDGE STRUCTURE CONNECTING ISLANDS - Patterned magnetic recording media and associated methods of fabrication are described. The patterned magnetic recording media includes a perpendicular magnetic recording layer that is patterned into a plurality of discrete magnetic islands. The patterned magnetic recording media also includes an exchange bridge structure formed from magnetic material that connects the islands of the perpendicular magnetic recording layer. Connecting the islands with magnetic material increases exchange coupling between the islands, which makes the islands more magnetically stable.03-31-2011
20110102944METHOD OF PRODUCING A PERPENDICULAR MAGNETIC RECORDING MEDIUM AND PERPENDICULAR MAGNETIC RECORDING MEDIUM - An object of the present invention is to provide a perpendicular magnetic recording medium including a suitable lubricating layer with sufficient durability, moisture resistance, and contamination resistance and also maintaining an R/W characteristic. In a typical structure of the present invention, a method of manufacturing a perpendicular magnetic recording medium 05-05-2011
20110102945MAGNETIC DISK SUBSTRATE, METHOD FOR MANUFACTURING THE SAME, AND MAGNETIC DISK - Provided are a magnetic disk substrate that can be adapted to a reduction in flying height of a head in an HDD and to an increase in rotational speed therein, and a method of manufacturing such a substrate.05-05-2011
20100246064LUBRICANT COMPOUND FOR A MAGNETIC DISK, MAGNETIC DISK, AND METHOD OF MANUFACTURING THE SAME - In a magnetic disk has at least a magnetic layer, a carbon-based protective layer, and a lubricating layer formed in this order over a substrate, the lubricating layer contains a lubricant compound including a compound which has a perfluoropolyether main chain in a structure thereof, an aromatic group located at a position except each end of a molecule thereof, and a polar group at each end of the molecule.09-30-2010
20090059429BIT PATTERNED MEDIUM - Provided is a bit patterned medium including bridges which induce exchange coupling between adjacent bits in order to reduce a switching field difference resulting from different magnetization directions of bits. The bridges and the bits are integrally formed with each other. The bits are locally connected by the bridges. A magnetostatic force for each bit is reduced due to an exchange coupling between adjacent bits, thereby reducing a switching field distribution of the bits.03-05-2009
20100321826MAGNETIC RECORDING MEDIUM AND MANUFACTURING METHOD OF THE MAGNETIC RECORDING MEDIUM - It is an object to manufacture magnetic recording media with the high recording density. Since nonmagnetic portions (12-23-2010
20100232065MAGNETIC DISK AND METHOD OF MANUFACTURING THE SAME - A magnetic disc is provided with a magnetic layer, a protection layer and a lubrication layer in this order on a substrate. After successively forming the magnetic layer and the protection layer on the substrate, the protection layer is exposed to plasma under normal pressure, then, the lubrication layer is formed on the protection layer. The plasma is generated in at least one kind of gas selected from among nitrogen gas, argon gas, oxygen gas, and fluorine hydrocarbon gas. The protection layer is a hydrogenated carbon protection layer.09-16-2010
20120327536Media Design for High TPI for Write Fringing Reduction - A recording media design having discrete track recording structure where the trenches between tracks are filled with a soft magnetic material is provided. The soft magnetic material provides a low magnetic impedance path to the soft underlayer such that fringe fields from the write head are conducted to the soft underlayer without having a negative effect such as adjacent track erasure. A method of manufacturing the media includes a nano-imprint step and ion milling out the data layer to create the trenches. A B12-27-2012
20120140359Perpendicular Magnetic Recording Media06-07-2012
20130010389PATTERNED MEDIA WITH AN ALTERNATING SERIES OF CONCENTRIC SERVO ZONES AND OVERLAP ZONES - Embodiments described herein provide for patterned media concentric zones with an alternating series of concentric servo zones and overlap zones. The overlap zones facilitate the writing of servo data between servo zones of different servo frequency. The overlap zones may be dual frequency zones. The dual frequency zones have a first set of overlap patterns with the substantially identical pattern as the bordering lower frequency servo zone and a second set of overlap patterns with the substantially identical pattern as the bordering higher frequency servo zone. A bootstrap zone can be included near the inner diameter to assist initial servo writing. Alternatively the overlap zones are bootstrap zones. Such bootstrap zones have both bootstrap patterns and overlap patterns, the overlap patterns have the substantially identical pattern as a bordering servo zone. Bootstrap patterns only require DC magnetization for servo operability.01-10-2013
20130010388PATTERNED MEDIA WITH AN ALTERNATING SERIES OF CONCENTRIC SERVO ZONES AND OVERLAP ZONES - Embodiments described herein provide for patterned media concentric zones with an alternating series of concentric servo zones and overlap zones. The overlap zones facilitate the writing of servo data between servo zones of different servo frequency. The overlap zones may be dual frequency zones. The dual frequency zones have a first set of overlap patterns with the substantially identical pattern as the bordering lower frequency servo zone and a second set of overlap patterns with the substantially identical pattern as the bordering higher frequency servo zone. A bootstrap zone can be included near the inner diameter to assist initial servo writing. Alternatively the overlap zones are bootstrap zones. Such bootstrap zones have both bootstrap patterns and overlap patterns, the overlap patterns have the substantially identical pattern as a bordering servo zone. Bootstrap patterns only require DC magnetization for servo operability.01-10-2013
20130208378BIT PATTERNED MEDIA - The invention relates to bit patterned recording media having a stop layer for chemical mechanical polishing. One embodiment of the present invention is a method of manufacturing a magnetic recording medium comprising the step of planarizing by chemical mechanical polishing until the stop layer is reached. The present invention also provides a magnetic recording medium having a stop layer.08-15-2013
20110267718MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING THE SAME - According to one embodiment, a magnetic recording medium includes a plurality of magnetic dots having a pattern formed by self organization. The density of magnetic dots in a peripheral portion of a central portion in a widthwise direction is higher than that of magnetic dots in the central portion at a burst portion of the magnetic recording medium.11-03-2011
20130128386RECORDING MEDIUM - In various embodiments, a recording medium having a servo layer configured to provide servo information and a data recording layer configured to record data, wherein the medium comprises a plurality of servo patterns and a plurality of data segment in one sector, each data segment corresponding to each of the plurality of servo patterns, wherein the plurality of servo patterns comprises a first servo pattern comprising an automatic gain control, a second servo pattern comprising a sector address mark, a third servo pattern comprising a GrayCode, and a fourth servo pattern comprising a plurality of servo bursts, wherein the data recording layer is configured to record the data on the data segments corresponding to the first, second, third and fourth servo patterns.05-23-2013
20110222189Magnetic recording medium and method for producing the same - A patterned magnetic recording medium, accessible by a magnetic recording head, including a plurality of tracks, a width direction of each track and that of the magnetic recording head being of a skew angle. The patterned magnetic recording medium includes a plurality of magnetic dots, each corresponding to a recording bit, formed on a non-magnetic material. The plurality of magnetic dots are arranged in a plurality of arrays, each array corresponding to one of the tracks. Every N adjacent magnetic dots of the array define a polygon, one side thereof being parallel to the corresponding track, and another side thereof being parallel to a direction corresponding to the skew angle of the corresponding track.09-15-2011
20100309584MAGNETIC RECORDING MEDIUM AND MANUFACTURING METHOD OF THE SAME - To provide a magnetic recording medium enabling excellent magnetic recording reproduction characteristics to be exhibited with the spacing loss reduced and a manufacturing method of the medium, a method of manufacturing a magnetic recording medium of the invention is to manufacture a magnetic recording medium having a magnetic recording layer of a granular structure having nonmagnetic boundary portions between pillar-shaped magnetic particles on a nonmagnetic substrate, and an exchange coupling layer provided on the magnetic recording layer to add an action of exchange coupling the magnetic particles, and is characterized by having an ion irradiation step of performing ion irradiation on the entire surface of the exchange coupling layer after layering the exchange coupling layer on the magnetic recording layer.12-09-2010
20130155549PATTERNED MAGNETIC STORAGE MEDIUM - According to one embodiment, a patterned magnetic storage medium is disclosed herein. The magnetic storage medium includes a magnetic domain, a substantially non-magnetic region laterally adjacent to the magnetic domain, and an exchange spring structure disposed between the magnetic domain and the laterally adjacent non-magnetic region wherein the exchange spring structure comprises implanted ions.06-20-2013
20120019960MAGNETIC RECORDING MEDIUM - According to one embodiment, a bit patterned medium includes a substrate, and a magnetic recording layer disposed above the substrate and including patterns of protrusions. Each of the protrusions contains a plurality of crystal grains. An average distance between the crystal grains is 0.5 to 3.0 nm in each of the protrusions. The protrusions include first protrusions each having a length of 1 μm or more in a radial direction of the medium and second protrusions each having a length in the radial direction shorter than the length of the first protrusion in the radial direction. Each of the first protrusions has a nucleation field Hn for magnetization reversal and a coercive force Hc satisfying the inequalities, Hn≧1.5 kOe and 0.5 kOe≦Hc−Hn≦1.5 kOe.01-26-2012
20120092793Patterned structure in a storage media - An embodiment of the invention provides an apparatus that includes: a storage media including a patterned structure, the patterned structure including a first groove, a first stopper in the first groove, wherein the first stopper is configured to interrupt the flow of gas in a section within the first groove.04-19-2012

Patent applications in class Disk