Class / Patent application number | Description | Number of patent applications / Date published |
428828000 | Magnetic layers separated by nonmagnetic (antiferromagnetic, Cu, dielectric, etc.) layer(s) | 78 |
20080199734 | PERPENDICULAR MAGNETIC RECORDING MEDIUM, MANUFACTURING METHOD THEREOF AND MAGNETIC RECORDING DEVICE - The thickness of the spacer layer is set in such as way as to obtain the anti-parallel magnetic coupling between two amorphous ferromagnetic layers in the perpendicular medium. When the thickness of the spacer layer is changed, the exchange field shows an oscillatory behavior and the highest values of the exchange fields are obtained at various thicknesses and indicates an anti-parallel exchange between them. A conventional recording medium applies the smallest thickness (1st APS) among the thicknesses corresponding to the exchange field maximum. On the other hand, the present invention applies the second smallest thickness (2nd APS) to obtain larger tolerance of spacer layer thickness and improved writability and enhanced recording performance. | 08-21-2008 |
20080213628 | Perpendicular recording media with Ta transition layer to improve magnetic and corrosion resistance performances and method of manufacturing the same - A perpendicular magnetic recording medium comprising a substrate, an underlayer, a Ta-containing seedlayer, a magnetic layer, wherein the underlayer comprises a soft magnetic material and the Ta-containing seedlayer is between the underlayer and the magnetic layer, and a process for improving corrosion resistance of the recording medium and for manufacturing the recording medium are disclosed. | 09-04-2008 |
20080241598 | MAGNETIC RANDOM ACCESS MEMORY HAVING MAGNETORESISTIVE ELEMENT WITH NONMAGNETIC METAL LAYER - A magnetic random access memory in which a plurality of magnetoresistive elements are laid out in an array, the magnetoresistive element includes a lower ferromagnetic layer, an upper ferromagnetic layer which has a planar shape smaller than a planar shape of the lower ferromagnetic layer, a first nonmagnetic insulating layer which is formed between the lower ferromagnetic layer and the upper ferromagnetic layer, and a first nonmagnetic metal layer which is formed between the first nonmagnetic insulating layer and the upper ferromagnetic layer. | 10-02-2008 |
20080254324 | PERPENDICULAR MAGNETIC RECORDING MEDIUM WITH EXCHANGE-COUPLED MAGNETIC LAYERS AND IMPROVED COUPLING LAYER - A perpendicular magnetic recording medium has an “exchange-spring” type magnetic recording layer (RL) with an improved coupling layer (CL). The RL includes the first or lower ferromagnetic layer MAG | 10-16-2008 |
20080292907 | PATTERNED PERPENDICULAR MAGNETIC RECORDING MEDIUM WITH EXCHANGE COUPLED RECORDING LAYER STRUCTURE AND MAGNETIC RECORDING SYSTEM USING THE MEDIUM - A patterned perpendicular magnetic recording medium has discrete magnetic islands, each of which has a recording layer (RL) structure that comprises two exchange-coupled ferromagnetic layers. The RL structure may be an “exchange-spring” RL structure with an upper ferromagnetic layer (MAG | 11-27-2008 |
20090061259 | BIT PATTERNED MEDIUM - A bit patterned medium in which an exchange coupling layer induces exchange coupling between adjacent bits in order to reduce a switching field difference resulting from different magnetization directions of bits. The exchange coupling layer is disposed either over or under a recording layer having a plurality of bits. The exchange coupling layer induces exchange coupling between a bit which is to be recorded and an adjacent bit and reduces a switching field difference resulting from a difference between the magnetization direction of the bit to be recorded and the magnetization direction of neighboring bits due to an exchange coupling force generated during the exchange coupling. | 03-05-2009 |
20090081483 | PERPENDICULAR MAGNETIC RECORDING DISK AND MANUFACTURING METHOD THEREOF - A magnetic disk | 03-26-2009 |
20090081484 | MAGNETIC RECORDING MEDIUM - A magnetic recording medium for thermally assisted recording is disclosed which achieves both high density writing and good control of temperature characteristics. The magnetic recording medium for thermally assisted recording comprises an underlayer, a magnetic recording layer, and a protective layer sequentially laminated on a nonmagnetic substrate. The magnetic recording layer has a structure composed of two magnetic layers and an exchange coupling control layer inserted between the magnetic layers, the two magnetic layers being magnetically coupled through the exchange coupling control layer. The coupling energy Jw in the process of writing a signal and the coupling energy Jr in the state of retaining a signal satisfy a relation 003-26-2009 | |
20090098413 | DOT-PATTERNED STRUCTURE MAGNETIC RECORDING MEDIUM AND METHOD FOR PRODUCTION THEREOF - Disclosed herein are a dot-patterned structure for magnetic recording bits and a magnetic recording medium provided therewith. The former exhibits high functionality and high performance owing to good crystallinity. The dot-patterned structure is composed of a first layer, which is continuous, and a second layer, which is discrete. The magnetic recording medium having a dot-patterned recording layer is formed by the steps of treating an underlying layer by lithography, thereby forming grooves, filling the grooves by epitaxial growth with the same material as the underlying layer, removing the photoresist used for lithography in a solvent, thereby forming pits, and filling the pits by epitaxial growth with a magnetic film as the recording layer. | 04-16-2009 |
20090110961 | MAGNETIC RECORDING MEDIUM, METHOD OF MANUFACTURING THE SAME, AND MAGNETIC STORAGE DEVICE - A magnetic recording medium used for a hard disc drive and the like, a method of manufacturing the same, and a magnetic storage device. The magnetic recording medium that includes a substrate, a first ferromagnetic layer formed on the substrate, a non-magnetic layer formed on the first ferromagnetic layer and including a ferromagnetic element and a second ferromagnetic layer formed on the non-magnetic layer, wherein the first ferromagnetic layer and the second ferromagnetic layer are magnetically coupled through the non-magnetic layer. | 04-30-2009 |
20090123782 | METHOD FOR MANUFACTURING MAGNETIC RECORDING MEDIA - A method for manufacturing discrete track media and patterned media is disclosed which enables a magnetic recording layer having excellent magnetic characteristics to be obtained without imparting damage to a crystal orientation control layer which is at the surface when forming the magnetic recording layer. The method for manufacturing magnetic recording media comprises a process of forming a soft magnetic layer on a substrate; a process of forming a first crystal orientation control layer on the soft magnetic layer; a process of providing a depression in at least a portion of the first crystal orientation control layer; a process of performing heat treatment of the first crystal orientation control layer; and a process of forming a magnetic recording layer on the first crystal orientation control layer. | 05-14-2009 |
20090136782 | MAGNETIC RECORDING MEDIA HAVING A CHEMICALLY ORDERED MAGNETIC LAYER - A thin film structure having a magnetic layer and a seed layer positioned adjacent to the magnetic layer is provided. The seed layer includes a L1 | 05-28-2009 |
20090155627 | DISCRETE TRACK MEDIA WITH A CAPPED MEDIA STRUCTURE HAVING HIGH MOMENT AND EXCHANGE - A media architecture is optimized for discrete track recording. A capped or exchange-spring media uses a thin media structure and incorporates higher moment density magnetic layers. A thin exchange coupling layer is used in conjunction with a cap layer to control the reversal mechanism and exchange. Thus, the exchange coupling layer mediates the interaction between the two outer magnetic layers. The thickness of the exchange coupling layer is tuned by monitoring the media signal-to-noise ratio, track width and bit error rate. The recording performance is enhanced by tuning the intergranular exchange in the system through the use of the high-moment cap as writeability, resolution and noise are improved. | 06-18-2009 |
20090155628 | MAGNETIC THIN FILM STRUCTURE, MAGNETIC RECORDING MEDIUM INCLUDING THE SAME, AND METHOD OF MANUFACTURING THE MAGNETIC RECORDING MEDIUM - A magnetic thin film structure, a magnetic recording medium including the same, and a method of manufacturing the magnetic recording medium are provided. The magnetic recording medium includes an under layer formed of a transition metal nitride on a substrate and a plurality of magnetic dots, which are unit recording regions, formed of a magnetic material having magnetic anisotropy energy between 10 | 06-18-2009 |
20090202865 | MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING THE SAME - According to one embodiment, a magnetic recording medium includes magnetic patterns made of a ferromagnetic recording layer containing Co, and a nonmagnetic layer which separates the magnetic patterns and has a lower Co concentration than the magnetic patterns. | 08-13-2009 |
20090239100 | MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING SAME - A magnetic recording medium is formed by stacking in order, on a nonmagnetic base, at least an underlayer, magnetic recording layer, and protective layer. The magnetic recording layer includes a plurality of magnetic layers and an exchange-coupling control layer, and the magnetic recording medium is characterized in that a physical pattern is formed in the exchange-coupling control layer. The exchange-coupling control layer is located between the magnetic layers of the magnetic recording layer. | 09-24-2009 |
20090280357 | PERPENDICULAR MAGNECTIC RECORDING MEDIA WITH IMPROVED FCC AU-CONTAINING INTERPLAYERS - A perpendicular magnetic recording medium, comprising a non-magnetic interlayer structure selected from the group consisting of:
| 11-12-2009 |
20090305080 | Perpendicular magnetic recording medium - A perpendicular magnetic recording medium, which includes a nonmagnetic substrate, and a first underlayer in the form of a soft magnetic under-layer (SUL), a second underlayer, an intermediate layer, a magnetic recording layer, a protective layer, and a lubricant layer sequentially laminated on the nonmagnetic substrate. The SUL has a plurality of SUL layers including a type-A SUL layer, a plurality of type-B SUL layers including at least two adjacent type-B SUL layers, and a nonmagnetic metal spacer layer disposed between the two adjacent type-B SUL layers. The type-A SUL layer may include a material selected from Co, Fe and Ni, a material selected from Cr, V and Ti, and a material selected from W, Zr, Ta and Nb. Each of the type-B SUL layers is in antiferromagnetic coupling, and may include a material selected from Co, Fe and Ni, a material selected from Cr, V and Ti, and a material selected from W, Zr, Ta and Nb. | 12-10-2009 |
20090311557 | PERPENDICULAR MAGNETIC RECORDING DISK AND METHOD OF MANUFACTURING THE SAME - [Object] To achieve a high coercive force (Hc) and low-noise characteristics (high S/N ratio) through realization of both segregation of SiO | 12-17-2009 |
20100021767 | DISCRETE TRACK MEDIA - A method of fabricating a discrete track magnetic recording media. A base layer is provided onto which repeating and alternating magnetic layer and non-magnetic layers are deposited. The thickness of the magnetic layer corresponds to the width of the track of the recording media. A cylindrical rod can be used as the base layer, such that the alternating magnetic and non-magnetic layers spiraling or concentric layers around the rod. The resulting media layer can be cut or sliced into individual magnetic media or used to imprint other media discs with the discrete pattern of the media layer. | 01-28-2010 |
20100167091 | GLASS FOR USE IN SUBSTRATE FOR INFORMATION RECORDING MEDIUM, SUBSTRATE FOR INFORMATION RECORDING MEDIUM AND INFORMATION RECORDING MEDIUM, AND THEIR MANUFACTURING METHOD - According to one aspect of the present invention, provided is glass for use in substrate for information recording medium, which comprises, denoted as molar percentages, a total of 70 to 85 percent of SiO | 07-01-2010 |
20100209739 | MAGNETIC STORAGE MEDIA WITH Ag, Au-CONTAINING MAGNETIC LAYERS - A magnetic recording medium having a Au, Ag-containing magnetic layer having Co, Cr, Ag and Au; the magnetic recording layer having Co-containing magnetic grains surrounded by substantially nonmagnetic Cr-containing grain boundaries; wherein said Ag and said Au are substantially immiscible in the Co-containing magnetic grains is disclosed. | 08-19-2010 |
20100221580 | Granular Perpendicular Media Interlayer For A Storage Device - An apparatus and method are provided for improving perpendicular magnetic recording media. The present invention provides media, and a method of fabricating media in a cost-effective manner, with a reduced ruthenium (Ru) content interlayer structure, while meeting media performance requirements. A perpendicular magnetic recording medium is provided comprising a non-magnetic substrate having a surface, and a layer stack situated on the substrate surface. The layer stack comprises, in overlying sequence from the substrate surface a magnetically soft underlayer; an amorphous or crystalline, non-magnetic seed layer; an interlayer structure for crystallographically orienting a layer of a perpendicular magnetic recording material situated on the underlayer; and at least one crystallographically oriented, magnetically hard, perpendicular magnetic recording layer situated on the interlayer structure. The interlayer structure is a stacked structure comprising, in overlying sequence: a chromium alloy situated on the seed layer; and an upper interlayer situated on the chromium alloy. | 09-02-2010 |
20100247969 | SYSTEM, METHOD AND APPARATUS FOR MULTIPLE ANISOTROPY LAYERED MAGNETIC STRUCTURES FOR CONTROLLING REVERSAL MECHANISM AND TIGHTENING OF SWITCHING FIELD DISTRIBUTION IN BIT PATTERNED MEDIA - Multiple anisotropy layered magnetic structures for controlling reversal mechanism and tightening of switching field distribution in bit patterned media are disclosed. The invention extends the exchange spring concept to more variable and sophisticated structures. Three or more layers with different anisotropy or anisotropy gradients increase writeability gains beyond the simple hard/soft bilayer exchange spring concept for BPM. The structures have a thin very hard, high anisotropy center layer that acts as a threshold or pinning layer for domain wall propagation through the entire media structure. In addition or alternatively, a thin very soft, low anisotropy center layer in between the commonly used soft surface layer and hard media layer allows quick initial propagation of the domain wall into the center of the media structure. Various properties of the media structures can be tuned more independently for optimization if using more advanced multi-anisotropy layer stacks. | 09-30-2010 |
20100279151 | PERPENDICULAR MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING THE SAME - A perpendicular magnetic recording medium includes a substrate, a soft magnetic layer, a pre-underlayer, an underlayer, and a main recording layer serving as a magnetic recording layer. The pre-underlayer contains seed crystal grains that serve as a base for crystal grains of the underlayer, and an addition substance that is added between the seed crystal grains and composed of an element having an atomic radius smaller than that of an element forming the seed crystal grains. | 11-04-2010 |
20100297476 | PERPENDICULAR MAGNETIC RECORDING MEDIUM - A perpendicular magnetic recording medium includes a nonmagnetic substrate, and a soft magnetic layer, a first orientation control layer, a second orientation control layer, a nonmagnetic intermediate layer, a magnetic recording layer, and a protective layer layered sequentially on the nonmagnetic substrate. The first orientation control layer includes a thin film having a face-centered cubic (fcc) structure. The magnetic recording layer includes a thin film layer having ferromagnetic crystal grains and nonmagnetic grain boundaries surrounding the ferromagnetic crystal grains, the ferromagnetic crystal grains including a CoPt alloy having ferromagnetic properties, and the nonmagnetic grain boundaries including an oxide or a nitride. The nonmagnetic intermediate layer includes a thin film containing Ru. The second orientation control layer includes an alloy thin film having an element selected from among Ni and Fe and having the fcc structure, the second orientation control layer having a saturation magnetic flux density Bs of 1 T or lower. | 11-25-2010 |
20110076516 | Perpendicular Magnetic Recording Media with Magnetic Anisotropy Gradient and Local Exchange Coupling - A perpendicular magnetic recording medium adapted for high recording density and high data recording rate comprises a non-magnetic substrate having at least one surface with a layer stack formed thereon, the layer stack including a perpendicular recording layer containing a plurality of columnar-shaped magnetic grains extending perpendicularly to the substrate surface for a length, with a first end distal the surface and a second end proximal the surface, wherein each of the magnetic grains has: (1) a gradient of perpendicular magnetic anisotropy field H | 03-31-2011 |
20110097604 | PERPENDICULAR MAGNETIC RECORDING MEDIUM - An object of the present invention is to provide a perpendicular magnetic recording medium capable of reducing noise in an electromagnetic transducing characteristic in a configuration including a magnetic recording layer of a granular structure containing Co and an auxiliary recording layer. The perpendicular magnetic recording medium of the present invention includes: on a non-magnetic substrate, a first magnetic recording layer | 04-28-2011 |
20110129691 | DOMAIN WALL MOTION ELEMENT AND MAGNETIC RANDOM ACCESS MEMORY - A domain wall motion element has a magnetic recording layer 10 that is formed of a ferromagnetic film and has a domain wall DW. The magnetic recording layer | 06-02-2011 |
20110143166 | SPIN-VALVE RECORDING ELEMENT AND STORAGE DEVICE - A spin-valve element has a pair of ferromagnetic layers having mutually different coercive forces, sandwiching an insulating layer or a nonmagnetic layer therebetween. The in-plane shape of the spin-valve element is substantially circular in shape but is provided, in the peripheral portion, with a plurality of cutouts N | 06-16-2011 |
20110212346 | PERPENDICULAR MAGNETIC RECORDING MEDIUM AND PROCESS FOR MANUFACTURE THEREOF - An object of the present invention is to provide a perpendicular magnetic recording medium the SNR of which is improved by reducing noise thought to be due to an auxiliary recording layer so that a higher recording density can be achieved, and a method of manufacturing the same. | 09-01-2011 |
20110244269 | Perpendicular magnetic recording medium - A perpendicular magnetic recording medium includes at least a soft-magnetic underlayer, a non-magnetic underlayer, a ferromagnetic intermediate layer, a non-magnetic intermediate layer, and a perpendicular magnetic recording layer sequentially stacked on a non-magnetic substrate. In an embodiment, the ferromagnetic intermediate layer is formed of a CoCr based alloy, a product Bs·t of a saturation magnetic flux density and film thickness of the ferromagnetic intermediate layer is within a range of 0.15 to 3.6 T·nm, and the non-magnetic intermediate layer has a film thickness of 3 nm or more. | 10-06-2011 |
20110311839 | MAGNETIC RECORDING MEDIUM AND METHOD FOR MANUFACTURING SAME - A manufacturing method for a magnetic recording medium includes forming a magnetic layer on a base material, forming a recording layer having a textured pattern of the magnetic layer by forming a recessed portion that passes through the magnetic layer, depositing an oxidizing material or a nitriding material on the inner surface of the recessed portion while leaving a space in the recessed portion, packing the space with an oxide material or a nitride material by oxidizing or nitriding the deposited material, and planarizing by removing excess oxide material or nitride material on the recording layer. | 12-22-2011 |
20110311840 | METHOD FOR MANUFACTURING MAGNETIC RECORDING MEDIA - A method for manufacturing discrete track media and patterned media is disclosed which enables a magnetic recording layer having excellent magnetic characteristics to be obtained without imparting damage to a crystal orientation control layer which is at the surface when forming the magnetic recording layer. The method for manufacturing magnetic recording media comprises a process of forming a soft magnetic layer on a substrate; a process of forming a first crystal orientation control layer on the soft magnetic layer; a process of providing a depression in at least a portion of the first crystal orientation control layer; a process of performing heat treatment of the first crystal orientation control layer; and a process of forming a magnetic recording layer on the first crystal orientation control layer. | 12-22-2011 |
20120021254 | PERPENDICULAR MAGNETIC RECORDING MEDIUM - A perpendicular magnetic recording medium is disclosed which is capable of reducing the orientational dispersion and crystal grain size of a magnetic recording layer, simultaneously reducing the thickness of a non-magnetic intermediate layer, hence, reducing noise, and improving S/N ratio and recording density characteristics. The medium includes a non-magnetic substrate, soft magnetic underlayer, seed layer, first non-magnetic intermediate layer, second non-magnetic intermediate layer, granular magnetic recording layer, exchange coupling force control layer, non-granular magnetic recording layer, protective layer, and lubricant layer sequentially formed on the non-magnetic substrate. The first and second non-magnetic intermediate layers are laminated to form a two-layer non-magnetic intermediate layer and the seed layer is made of a material having an fcc structure. | 01-26-2012 |
20120028078 | Perpendicular Magnetic Recording Media with Magnetic Anisotropy Gradient and Local Exchange Coupling - A perpendicular magnetic recording medium adapted for high recording density and high data recording rate comprises a non-magnetic substrate having at least one surface with a layer stack formed thereon, the layer stack including a perpendicular recording layer containing a plurality of columnar-shaped magnetic grains extending perpendicularly to the substrate surface for a length, with a first end distal the surface and a second end proximal the surface, wherein each of the magnetic grains has: (1) a gradient of perpendicular magnetic anisotropy field H | 02-02-2012 |
20120070695 | MAGNETORESISTIVE ELEMENT - According to one embodiment, a magnetoresistive element includes a recording layer having a variable magnetization direction, a reference layer having an invariable magnetization direction, an intermediate layer provided between the recording layer and the reference layer, and a first buffer layer provided on a surface of the recording layer, which is opposite to a surface of the recording layer where the intermediate layer is provided. The recording layer comprises a first magnetic layer which is provided in a side of the intermediate layer and contains CoFe as a main component, and a second magnetic layer which is provided in a side of the first buffer layer and contains CoFe as a main component, a concentration of Fe in the first magnetic layer being higher than a concentration of Fe in the second magnetic layer. The first buffer layer comprises a nitrogen compound. | 03-22-2012 |
20120088125 | MAGNETORESISTIVE ELEMENT AND MAGNETIC MEMORY - A magnetoresistive element according to an embodiment includes: a base layer; a first magnetic layer formed on the base layer and having a changeable magnetization direction with an easy axis of magnetization in a direction perpendicular to a film plane; a first nonmagnetic layer formed on the first magnetic layer; and a second magnetic layer formed on the first nonmagnetic layer and having a fixed magnetization layer with an easy axis of magnetization in a direction perpendicular to the film plane. The first magnetic layer includes a ferrimagnetic layer having a DO | 04-12-2012 |
20120100396 | METHOD FOR MANUFACTURING PERPENDICULAR MAGNETIC RECORDING MEDIUM - A method for manufacturing with high productivity a magnetic recording medium having an MgO film is disclosed which uses a DC sputtering method. The method suppresses oxygen deficiency in the MgO film, and the MgO film has high crystallinity. The method includes at least a process of forming an intermediate layer of MgO on a nonmagnetic base by a reactive DC sputtering method that uses a target containing Mg and MgO in an oxygen-containing gas, and a process of forming a magnetic recording layer containing an L1 | 04-26-2012 |
20120148874 | STORAGE ELEMENT AND MEMORY DEVICE - A storage element including: a storage layer; a magnetization fixed layer; and an insulating layer, wherein by injecting spin-polarized electrons in a laminating direction of a layered structure that includes the storage layer, the insulating layer, and the magnetization fixed layer, the orientation of magnetization of the storage layer changes and recording of information is performed on the storage layer, and an Fe film and a film that includes Ni are formed in order from an interface side that is in contact with the insulating layer, and a graded composition distribution of Ni and Fe is formed after heating on at least one of the storage layer and the magnetization fixed layer. | 06-14-2012 |
20120231298 | METHOD OF FABRICATING A PERPENDICULAR MAGNETIC RECORDING MEDIUM - A method of forming a perpendicular magnetic recording medium. The perpendicular magnetic recording medium comprises a substrate, an underlayer on the substrate, an intermediate layer on the underlayer and a recording layer on the intermediate layer. The underlayer comprises a first soft underlayer, an antiferromagnetically coupled Ru layer on the first soft underlayer, a second soft underlayer on the antiferromagnetically coupled Ru layer, and an orientation control layer on the second soft underlayer, the method comprises applying a negative bias voltage to the substrate during formation of the underlayer. | 09-13-2012 |
20120276414 | MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING/REPRODUCTION APPARATUS - According to one embodiment, a perpendicular magnetic recording medium includes a nonmagnetic interlayer formed on a nonmagnetic substrate, an antiferromagnetic layer having a thickness of 2 to 30 nm, a first nonmagnetic underlayer having a thickness of 0.2 to 5 nm, a first bit patterned ferromagnetic layer, a first bit patterned nonmagnetic layer, and a second bit patterned ferromagnetic layer. | 11-01-2012 |
20120328907 | GLASS FOR USE AS SUBSTRATE FOR INFORMATION RECORDING MEDIUM, SUBSTRATE FOR INFORMATION RECORDING MEDIUM AND INFORMATION RECORDING MEDIUM, AND THEIR PRODUCTION METHODS - According to one aspect of the present invention, provided is glass for use in substrate for information recording medium, which comprises, denoted as molar percentages, a total of 70 to 85 percent of SiO | 12-27-2012 |
20130017413 | Discrete Track Media - A method of fabricating a discrete track magnetic recording media. A base layer is provided onto which repeating and alternating magnetic layer and non-magnetic layers are deposited. The thickness of the magnetic layer corresponds to the width of the track of the recording media. A cylindrical rod can be used as the base layer, such that the alternating magnetic and non-magnetic layers spiraling or concentric layers around the rod. The resulting media layer can be cut or sliced into individual magnetic media or used to imprint other media discs with the discrete pattern of the media layer. | 01-17-2013 |
20130022842 | Magnetic 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 antiparallel 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. | 01-24-2013 |
20130045396 | FERROMAGNETICALLY COUPLED MAGNETIC RECORDING MEDIA - A ferromagnetically coupled magnetic recording medium having a first ferromagnetic layer, a second ferromagnetic layer, and a ferromagnetic coupling layer to ferromagnetically couple the first ferromagnetic layer to the second ferromagnetic layer is used as stable magnetic media with high MrT in high density recording hard drives. The first ferromagnetic layer is the stabilization layer and the second ferromagnetic layer is the main recording layer. The ferromagnetic coupling layer comprises a conductive material having a thickness which produces ferromagnetic coupling between said first ferromagnetic layer and said second ferromagnetic layer via the RKKY interaction. | 02-21-2013 |
20130071693 | GRANULAR PERPENDICULAR MAGNETIC RECORDING APPARATUS - A method of manufacturing a granular perpendicular magnetic recording medium with improved corrosion resistance comprises sequential steps of providing a non-magnetic substrate including a surface; forming a soft magnetic underlayer (SUL) over the surface; post-deposition heating the SUL; forming an intermediate layer stack over the heated SUL; and forming at least one granular, magnetically hard perpendicular magnetic recording layer over the intermediate layer stack. Heating of the SUL prior to formation of the intermediate layer stack results in formation of an intermediate layer stack with a smoother surface and a granular perpendicular recording layer with increased corrosion resistance than when SUL post-deposition heating is not performed. | 03-21-2013 |
20130130063 | PERPENDICULARLY MAGNETIZED THIN FILM STRUCTURE AND METHOD FOR MANUFACTURING THE SAME - A perpendicularly magnetized thin film structure and a method of manufacturing the perpendicularly magnetized thin film structure are provided. The perpendicularly magnetized thin film structure includes i) a base layer, ii) a magnetic layer located on the base layer and having an L1 | 05-23-2013 |
20130143072 | Soft Magnetic Under Layer - A soft magnetic under layer has a low antiferromagnetic coupling force and a high saturation magnetic flux density. The soft magnetic under layer includes two soft magnetic layers and a spacer layer. The soft magnetic layers are expressed by a composition formula as (Fe | 06-06-2013 |
20130224521 | High Thermal Stability Reference Structure with Out-of-Plane Aniotropy for Magnetic Device Applications - Enhanced Hc and Hk in addition to higher thermal stability to 400° C. are achieved in magnetic devices by adding dusting layers on top and bottom surfaces of a spacer in a synthetic antiferromagnetic (SAF) structure to give a RL1/DL1/spacer/DL2/RL2 reference layer configuration where RL1 and RL2 layers exhibit perpendicular magnetic anisotropy (PMA), the spacer induces antiferromagnetic coupling between RL1 and RL2, and DL1 and DL2 are dusting layers that enhance PMA. RL1 and RL2 layers are selected from laminates such as (Ni/Co)n, L1 | 08-29-2013 |
20130244058 | CoFeSiB/Pt Multilayers Exhibiting Perpendicular Magnetic Anisotropy - Provided is a magnetic anisotropy multilayer including a plurality of CoFeSiB/Pt layers used in a magnetic random access memory. The magnetic anisotropy multilayer includes a first Pt/CoFeSiB layer, and a second Pt/CoFeSiB layer formed on the first Pt/CoFeSiB layer. | 09-19-2013 |
20130288079 | Data Media With Tuned Thermal Conductivity and Magnetic Permeability - Various magnetic slack embodiments may be constructed with a soft magnetic underlayer (SUL) having a first thickness disposed between a substrate and a magnetic recording layer. A heatsink may have a second thickness and be disposed between the SUL and the magnetic recording layer. The first and second thicknesses may each be tuned to provide predetermined thermal conductivity and magnetic permeability throughout the data media. | 10-31-2013 |
20130295415 | Exchange Coupled Magnetic Elements - Approaches to reduce switching field distribution in energy assisted magnetic storage devices involve first and second exchange coupled magnetic elements. The first magnetic elements have anisotropy, H | 11-07-2013 |
20140011053 | Perpendicular Magnetic Recording Media with Magnetic Anisotropy Gradient and Local Exchange Coupling - A perpendicular magnetic recording medium adapted for high recording density and high data recording rate comprises a non-magnetic substrate having at least one surface with a layer stack formed thereon, the layer stack including a perpendicular recording layer containing a plurality of columnar-shaped magnetic grains extending perpendicularly to the substrate surface for a length, with a first end distal the surface and a second end proximal the surface, wherein each of the magnetic grains has: (1) a gradient of perpendicular magnetic anisotropy field H | 01-09-2014 |
20140030552 | PERPENDICULAR MAGNETIC RECORDING MEDIUM - A perpendicular magnetic recording medium is disclosed. The perpendicular magnetic recording medium includes a first layer, and a second layer positioned immediately below the first layer. Among the materials in the first layer and the second layer, if the interface energy when two different materials—material a and material b—are in contact is defined as Ei(a//b), the surface energy when material a exists independently is defined as Es(a), and the energy resulting by subtracting the sum of the respective surface energies (ΣEs) from the interface energy is defined as G(a//b), then when G(1//3)01-30-2014 | |
20140044993 | PERPENDICULAR RECORDING MEDIUM WITH OXIDE GRADIENT LAYER - Apparatus for recording data and method for making the same. In accordance with some embodiments, a recording layer is supported by a substrate. The recording layer has a granular magnetic recording layer with a first oxide content, a continuous magnetic recording layer with nominally no oxide content, and an oxide gradient layer disposed between the respective granular magnetic recording layer and the continuous magnetic recording layer. The oxide gradient layer has a second oxide content less than the first oxide content of the granular layer. | 02-13-2014 |
20140093746 | MAGNETIC SEED LAYER - An apparatus includes a disk substrate and a soft underlayer overlying the disk substrate. A magnetic seed layer overlies the soft underlayer, wherein the magnetic seed layer is formed by a hexagonal close-packed lattice material and has in-plane magnetic anisotropy. | 04-03-2014 |
20140234665 | PERPENDICULAR MAGNETIC RECORDING DISK WITH TEMPLATE LAYER FORMED OF NANOPARTICLES EMBEDDED IN A POLYMER MATERIAL - A perpendicular magnetic recording disk includes a template layer below a Ru or Ru alloy underlayer, with a granular Co alloy recording layer formed on the underlayer. substrate. The template layer comprises nanoparticles spaced-apart and partially embedded within a polymer material, with the nanoparticles protruding above the surface of the polymer material. A seed layer covers the surface of the polymer material and the protruding nanoparticles and an underlayer of Ru or a Ru alloy covers the seed layer. The protruding nanoparticles serve as the controlled nucleation sites for the Ru or Ru alloy atoms. The nanoparticle-to-nanoparticle distances can be controlled during the formation of the template layer. This enables control of the Co alloy grain diameter distribution as well as grain-to-grain distance distribution. | 08-21-2014 |
20140356649 | FEROMAGNETICALLY COUPLED MAGNETIC RECORDING MEDIA - A ferromagnetically coupled magnetic recording medium having a first ferromagnetic layer, a second ferromagnetic layer, and a ferromagnetic coupling layer to ferromagnetically couple the first ferromagnetic layer to the second ferromagnetic layer is used as stable magnetic media with high M | 12-04-2014 |
20150348579 | MAGNETIC RECORDING MEDIUM AND METHOD FOR MANUFACTURING THE SAME - A magnetic recording medium having high coercivity, in which an L1 | 12-03-2015 |
20160254017 | PERPENDICULAR MAGNETIC RECORDING MEDIUM | 09-01-2016 |
428828100 | Three or more magnetic layers on one substrate side | 17 |
20080199735 | PERPENDICULAR MAGNETIC RECORDING MEDIUM WITH EXCHANGE-SPRING STRUCTURE HAVING MULTIPLE EXCHANGE-SPRING LAYERS AND RECORDING SYSTEM FOR THE MEDIUM - A perpendicular magnetic recording system uses an exchange-spring type of perpendicular magnetic recording medium. The medium has a recording layer (RL) that includes a lower media layer (ML) and a multilayer exchange-spring layer (ESL) above the ML. The high anisotropy field (high-H | 08-21-2008 |
20090023016 | Perpendicular magnetic recording medium - Embodiments of the present invention help to provide a perpendicular magnetic recording medium in which a perpendicular magnetic recording layer is formed via a soft magnetic under-layer on a disk substrate, whereby the error rate is reduced and high density recording is enabled. According to one embodiment, the disk substrate is textured so that the center line average height (Ra) is from 0.05 nm to 0.2 nm, in which the soft magnetic under-layer is amorphous and has a film thickness from 2.5 nm to 10 nm, and the magnetic field for saturation (Hs) of the perpendicular magnetic recording layer is 7 kOe or less. | 01-22-2009 |
20090042062 | INTERLAYER DESIGN FOR MAGNETIC MEDIA - A magnetic recording medium having a substrate, an interlayer and a magnetic layer, the interlayer having at least a first intermediary layer, a second intermediary layer and a third intermediary layer, wherein the first intermediary layer or the third intermediary layer is non-magnetic or magnetic and the second intermediary layer has a hexagonal close pack crystal structure and a property of providing RKKY coupling between the first intermediary layer and the third intermediary layer when the first intermediary layer and the second intermediary layer are magnetic layers is disclosed. | 02-12-2009 |
20090155629 | TUNNEL JUNCTION MAGNETORESISTIVE SENSOR HAVING A NEAR ZERO MAGNETOSTRICTION FREE LAYER - A magnetoresistive tunnel junction sensor having improved free layer stability, as well as improved free sensitivity. The free layer is constructed to have a low magnetic coercivity which improves free layer sensitivity. The free layer is also constructed to have a negative magnetostriction which improves free layer stability by preventing the free layer from having an easy axis that is oriented perpendicular to die air bearing surface. | 06-18-2009 |
20100143750 | PERPENDICULAR MAGNETIC RECORDING MEDIUM - A perpendicular magnetic recording medium includes: a nonmagnetic substrate; a soft magnetic backing layer formed above the nonmagnetic substrate; a nonmagnetic intermediate layer formed on the soft magnetic backing layer; and a magnetic recording layer formed on the nonmagnetic intermediate layer, the magnetic recording layer including a first ferromagnetic recording layer having perpendicular magnetic anisotropy, a coupling layer formed on the first ferromagnetic recording layer and made of Pd, Pt or alloy of Pd and Pt, and a second ferromagnetic recording layer formed on the coupling layer and having perpendicular magnetic anisotropy. | 06-10-2010 |
20120064375 | METHOD FOR MANUFACTURING A PERPENDICULAR MAGNETIC DATA RECORDING MEDIA HAVING A PSEUDO ONSET LAYER - A method for manufacturing a magnetic media for perpendicular magnetic data recording. The method includes depositing a Ru layer in a pure oxygen atmosphere and then further depositing Ru in the presence of oxygen to form a thin pseudo onset layer. The pseudo onset layer can advantageously be depositing in the same deposition chamber and using the same target as that used to deposit the underlying Ru layer. This saves a great deal of manufacturing cost and complexity. The presence of the pseudo onset layer reduces grains size and increases grain separation in a high Ku magnetic layer deposited thereon, thereby increasing signal to noise ratio and decreasing magnetic core width (MCW). | 03-15-2012 |
20120135273 | Structure and method for enhancing interfacial perpendicular anisotropy in CoFe(B)/MgO/CoFe(B) Magnetic Tunnel Junctions - A STT-RAM MTJ is disclosed with a MgO tunnel barrier formed by natural oxidation process. A Co | 05-31-2012 |
20120135274 | NON-HCP MAGNETIC LAYER - A magnetic film or layer includes a non-hexagonal close pack (non-hcp) structure. | 05-31-2012 |
20120135275 | MAGNETIC MEMORY INCLUDING MEMORY CELLS INCORPORATING DATA RECORDING LAYER WITH PERPENDICULAR MAGNETIC ANISOTROPY FILM - A magnetic memory includes: a magnetization fixed layer having perpendicular magnetic anisotropy, a magnetization direction of the magnetization fixed layer being fixed; an interlayer dielectric; an underlayer formed on upper faces of the magnetization fixed layer and the interlayer dielectric; and a data recording layer formed on an upper face of the underlayer and having perpendicular magnetic anisotropy. The underlayer includes: a first magnetic underlayer; and a non-magnetic underlayer formed on the first magnetic underlayer. The first magnetic underlayer is formed with such a thickness that the first magnetic underlayer does not exhibit in-plane magnetic anisotropy in a portion of the first magnetic underlayer formed on the interlayer dielectric. | 05-31-2012 |
20120141833 | Perpendicular Magnetic Recording Disc - [Problem] A perpendicular magnetic disk with an improved SNR and an increased recording density by further improving crystal orientation of a preliminary ground layer formed of an Ni-base alloy is provided. | 06-07-2012 |
20120189872 | Perpendicular Magnetic Recording Disc - A perpendicular magnetic disk is provided. The disk includes, on a base and in the order from bottom, a first granular magnetic layer group including a plurality of magnetic layers each having a granular structure, a non-magnetic layer having Ru or a Ru alloy as a main component, a second granular magnetic layer group including a plurality of magnetic layers each having the granular structure, and an auxiliary recording layer having a CoCrPtRu alloy as a main component. Layers closer to a front surface among the plurality of magnetic layers included in the first granular magnetic layer group having an equal or smaller content of Pt. Layers closer to the front surface among the plurality of magnetic layers included in the second granular magnetic layer group having an equal or smaller content of Pt and having an equal or larger content of an oxide. | 07-26-2012 |
20120219827 | Stack Including a Magnetic Zero Layer - A stack including a crystallographic orientation interlayer, a magnetic zero layer disposed on the interlayer, and a magnetic recording layer disposed on the magnetic zero layer is disclosed. The magnetic zero layer is non-magnetic or has a saturation magnetic flux density (B | 08-30-2012 |
20120251846 | RECORDING MEDIA WITH MULTIPLE EXCHANGE COUPLED MAGNETIC LAYERS - A magnetic recording (PMR) disk structure is described. The PMR disk structure may include a magnetic capping layer being substantially free of an oxide, an upper magnetic layer with an oxide content disposed directly below and in contact with the magnetic capping layer, and an upper exchange coupling layer disposed below the upper magnetic layer. | 10-04-2012 |
20130052486 | MAGNETIC RECORDING MEDIUM - A magnetic recording medium has both satisfactory SNRs at high frequencies and satisfactory squash resistance, and is suitable for higher density recording. The magnetic recording medium includes at least a soft magnetic underlayer and a magnetic recording layer on a non-magnetic substrate. The soft magnetic underlayer includes a first soft magnetic layer, a second soft magnetic layer, an exchange coupling control layer, a third soft magnetic layer, and a fourth soft magnetic layer stacked in this order from the non-magnetic substrate side. The first and fourth soft magnetic layers both have a characteristic frequency of relative permeability higher than a higher one of characteristic frequencies of relative permeability of the second and third soft magnetic layers, and the second and third soft magnetic layers both have a relative permeability higher than a higher one of the relative permeabilities of the first and fourth soft magnetic layers. | 02-28-2013 |
20140037991 | MAGNETIC RANDOM ACCESS MEMORY WITH SYNTHETIC ANTIFERROMAGNETIC STORAGE LAYERS - A synthetic antiferromagnetic device includes a first tantalum layer, a reference layer disposed on the first tantalum layer and including a first cobalt iron boron layer, a second cobalt iron boron layer disposed on the first cobalt iron boron layer, a third cobalt iron boron layer and a second tantalum layer disposed between the second and third cobalt iron boron layers, a magnesium oxide spacer layer disposed on the reference layer and a cap layer disposed on the magnesium oxide spacer layer. | 02-06-2014 |
20140093747 | MAGNETIC RECORDING MEDIUM WITH ANTI-FERROMAGNETICALLY COUPLED MAGNETIC LAYERS - A magnetic recording medium includes a substrate and a plurality of anisotropic magnetic layers applied over the substrate. The medium further includes at least one anti-ferromagnetic coupling layer between two adjacent anisotropic magnetic layers of the plurality of anisotropic magnetic layers. | 04-03-2014 |
20160055873 | APPARATUS 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, H | 02-25-2016 |