Patent application number | Description | Published |
20080218906 | MAGNETIC RECORDING MEDIA AND METHOD OF MANUFACTURE OF THE SAME - A magnetic recording medium is disclosed in which there is no degradation of magnetic characteristics at the time of manufacture, such as is seen in proposed discrete-track media or patterned media. The medium can be manufactured by a simple method and results in excellent productivity. Magnetic recording media have a substrate, and, provided thereon in order from the substrate side, are a soft magnetic layer, a crystal orientation control layer, and a magnetic recording layer. The area of at least a portion of the crystal orientation control layer is provided with a depressed portion. Portions of the magnetic layer formed on this depressed portion have a non-granular structure, whereas portions of the magnetic formed on the crystal orientation control layer outside the depressed portion have a granular structure. A method for manufacturing the magnetic recording media is disclosed having a soft magnetic layer formation process of forming a soft magnetic layer on a substrate; a crystal orientation layer formation process of providing a crystal orientation control layer on the soft magnetic layer; a depressed portion formation process of providing a depressed portion in the area of at least a portion of the crystal orientation control layer; and a process of forming a magnetic recording layer on the crystal orientation control layer on which the depressed portion is formed. | 09-11-2008 |
20090123781 | 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. A 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 forming a second crystal orientation control layer on the first crystal orientation control layer; and a process of forming a magnetic recording layer on the second crystal orientation control layer. | 05-14-2009 |
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 |
20090261504 | IMPRINTING METHOD AND APPARATUS THEREFOR - An imprinting method includes the steps of setting a room-temperature imprint resist-coated substrate and a mold having a transfer surface having a pattern of projections and recesses therein in an assembling jig, pressing the patterned surface of the mold against the resist surface of the substrate, and releasing the mold from the substrate to separate the substrate, the mold and the assembling jig from one another. The steps are performed in plural independent units in each of which one step is executed, and the mold and the substrate are paired with each other by the assembling jig and conveyed between the units in a range of from the alignment step to the separation step. An imprinting apparatus includes an alignment unit which performs the alignment step, a press unit performing the press step, and a separation unit performing the separation step, wherein conveyance devices are provided to convey the mold and substrate between units. | 10-22-2009 |
20090261514 | IMPRINTING METHOD AND APPARATUS THEREFOR - An imprinting method forms a predetermined pattern in a resist surface of a substrate coated with a photo-curing type resist by using a mold having a pattern of projections and recesses formed in a transfer surface. The method includes an alignment step, a press step, a UV irradiation step, and a release step. The steps are performed in plural units selected from independent units, composite units, and combinations of independent units and composite units. The mold and the substrate are paired with each other and conveyed between the units. An imprinting apparatus includes plural units which perform the steps in the imprinting method and which are selected from independent units in each of which one step is executed, composite units in each of which plural of steps are executed, and combinations of independent units and composite units; and conveying devices which convey the mold and the substrate. | 10-22-2009 |
20100025878 | IMPRINTING METHOD AND APPARATUS THEREFOR - An imprinting method forms a pattern in a resist surface of a substrate coated with a thermoplastic resist by using a mold having a pattern of projections and recesses formed in a transfer surface. The method includes an alignment step, a heating step, a press step, a cooling step, and release step, wherein the steps are performed in a plurality of units selected from independent units, composite units, and combinations of independent units and composite units. A mold and a substrate are paired with each other and conveyed between the units. An imprinting apparatus includes a plurality of units which perform the steps in the imprinting method and which are selected from independent units, composite units, and combinations of independent units and composite units. Conveying devices are provided which convey the mold and the substrate paired with each other between the plurality of units. | 02-04-2010 |
20100092727 | NANOIMPRINTING MOLD AND MAGNETIC RECORDING MEDIA MANUFACTURED USING SAME - A mold for nanoimprinting is provided which enables excellent S/N ratios in magnetic recording media after pattern transfer. The mold includes: a base material; an intermediate layer disposed adjacent to the base material; and a pattern formation layer disposed adjacent to the intermediate layer and having a fine uneven pattern in the surface. The intermediate layer comprises an adhesive containing a silicone resin with ultraviolet ray transmission properties, the elastic modulus thereof is smaller than the elastic modulus of the base material, and moreover is smaller than the elastic modulus of the pattern formation layer. | 04-15-2010 |
20100112210 | Spin coating method and a spin-coating apparatus - Spin coating method for a recording medium having a hole in the center, including moving a tip of a feeding nozzle to an initial position at a distance X above a recording surface and a distance A radially apart from a periphery of the hole, feeding a coating liquid onto the recording surface for a predetermined period of time while rotating the recording medium at a predetermined speed, and moving the tip from the initial position along a radial direction towards an outer periphery of the recording medium while keeping the tip above the recording surface at the distance X. X satisfies X≦2 [3 r γ/(2 g C)] | 05-06-2010 |
20100119876 | Magnetic recording medium and method of manufacturing the same - A magnetic recording medium includes a substrate, and a soft magnetic layer, a crystal orientation control layer, a magnetic recording layer, and a protective layer formed sequentially on the substrate. The magnetic recording layer includes at least one granular magnetic layer having a granular structure and a non-granular magnetic layer having a non-granular structure. The at least one granular magnetic layers includes a plurality of magnetic portions and a separation portion surrounding the magnetic portions. The separation portion has magnetic characteristics different from the magnetic characteristics of the magnetic portions. The non-granular magnetic layer is a continuous film. | 05-13-2010 |
20110222189 | Magnetic 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 |
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 |
20110317300 | MAGNETIC TRANSFER MASTER SUBSTRATE, MAGNETIC TRANSFER METHOD AND METHOD OF MANUFACTURING THE SUBSTRATE - A magnetic transfer master substrate may have a ferromagnet pattern corresponding to a signal array. The substrate may include a non-magnetic base having depressed portions, formed on a surface thereof, which correspond to the signal array. A ferromagnet may be disposed in the depressed portions and includes a portion protruding above said surface. A section through the portion of the ferromagnet protruding from said surface taken perpendicularly to a surface of the substrate, includes a curved corner, a radius of curvature of which is no less than 2 nm and no more than 10 nm. The ferromagnet protrudes from the surface of the base by a distance no less than 2 nm and no more than 15 nm. A magnetic transfer method may include bringing the master substrate and a magnetic recording medium into contact and applying a magnetic field to record a magnetization pattern. | 12-29-2011 |
20120008224 | MAGNETIC TRANSFER MASTER SUBSTRATE, MAGNETIC TRANSFER METHOD USING THE SUBSTRATE, AND MAGNETIC TRANSFER MEDIUM - A magnetic transfer master substrate includes a non-magnetic base having depressed portions formed on a surface thereof corresponding to an information signal array, a ferromagnetic body formed in the depressed portions and having a top portion thereof protruding above the surface of the non-magnetic base, and a non-magnetic protective film covering the surface of the non-magnetic base, except for the depressed portion thereof, and also covering a side portion of the ferromagnetic body. A section through the ferromagnetic body, taken perpendicularly to the substrate, includes a round corner, a curvature of which has a radius of no less than 1 nm and no more than 10 nm. The apex of the top portion of the ferromagnetic body protrudes above the surface of the non-magnetic base by 2 nm or more, and protrudes above the surface of the non-magnetic protective film by a distance less than the radius of the curvature. | 01-12-2012 |
20120196154 | MAGNETIC RECORDING MEDIUM FOR HEAT-ASSISTED RECORDING DEVICE AND MANUFACTURING METHOD THEREOF - Disclosed are a magnetic recording medium for a heat-assisted recording device which has a high SNR at high density and a manufacturing method thereof. The magnetic recording medium includes, in the order recited: a non-magnetic substrate; a magnetic recording layer; a protective layer; and a liquid lubricating layer. The magnetic recording layer has a granular structure formed by a magnetic portion and a non-magnetic portion that surrounds the magnetic portion, the non-magnetic portion having a volume percentage based on the total volume of the granular structure ranging from 15 vol % to 30 vol % and including a carbon-based material. The magnetic recording medium has a surface having an arithmetic mean roughness Ra and an average length of roughness curve elements RSm such that Ra/RSm ranges from 0.05 to 0.15. | 08-02-2012 |
20130004797 | MAGNETIC RECORDING MEDIUM - A magnetic recording medium permits high recording densities while simultaneously satisfying requirements for the high-frequency SNR characteristic and the Squash characteristic. The magnetic recording medium includes at least a soft magnetic underlayer and a magnetic recording layer on a nonmagnetic substrate. The soft magnetic underlayer has a stacked structure that includes a soft magnetic layer on the nonmagnetic substrate side, an exchange coupling control layer, and a soft magnetic layer on the magnetic recording layer side. The soft magnetic layer on the magnetic recording layer side has a higher relative permeability characteristic frequency (the frequency at which the relative permeability is reduced by 50% compared with the relative permeability at 10 MHz) than the soft magnetic layer on the nonmagnetic substrate side, and the soft magnetic layer on the nonmagnetic substrate side has a higher relative permeability than the soft magnetic layer on the magnetic recording layer side. | 01-03-2013 |
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 |
20130186742 | METHOD FOR MANUFACTURING MAGNETIC RECORDING MEDIUM - A method for manufacturing a magnetic recording medium includes reducing and eliminating impurity gas present in a chamber. A magnetic recording layer is formed and an active material layer is also formed immediately below or immediately above the magnetic recording layer in respective chambers. The active material layer is formed in the same chamber or with a gate opened between the magnetic recording layer chamber and the active material layer chamber. | 07-25-2013 |
20140065445 | MAGNETIC RECORDING MEDIUM - A magnetic recording medium includes a substrate having sequentially formed thereon a magnetic layer; a protective layer having a thickness ranging from 1.0 nm to 2.5 nm and being composed of an amorphous metal layer having a thickness of at least 0.3 nm formed on the magnetic layer, and a carbon layer composed of amorphous carbon having a thickness of at least 0.3 nm formed on the amorphous metal layer; and a lubricating layer, wherein the carbon layer includes nitrogen atoms in a surface thereof in which a ratio of number of nitrogen atoms to total number of carbon atoms, nitrogen atoms, and oxygen atoms is 14 atomic % or less. Recording performance is improved by reducing the thickness of the protective layer thereof. A method of manufacturing the magnetic recording medium includes performing a nitrogen plasma treatment on a surface of the carbon layer that is effective to adjust the ratio. | 03-06-2014 |
20140322561 | MAGNETIC RECORDING MEDIUM - A magnetic recording medium is disclosed. The magnetic recording medium includes at least a disc-shaped non-magnetic substrate having a hole at a center, a soft magnetic underlying layer, and a magnetic recording layer. Relative permeability of the soft magnetic underlying layer under a magnetic field having one of the frequencies 100 MHz to 700 MHz increases gradually from a disc outer circumference to a disc inner circumference and a characteristic frequency of the relative permeability increases gradually from the disc inner circumference to the disc outer circumference. | 10-30-2014 |
20140377590 | MAGNETIC RECORDING MEDIUM FOR HEAT-ASSISTED MAGNETIC RECORDING - A magnetic recording medium for heat-assisted magnetic recording is provided. A magnetic recording layer includes upper and lower magnetic recording layers. The lower magnetic recording layer has a lower granular structure including lower magnetic crystal grains, and a lower non-magnetic portion, that surrounds the lower magnetic crystal grains, mainly composed of carbon. The upper magnetic recording layer has an upper granular structure including upper magnetic crystal grains, and an upper non-magnetic portion, that surrounds the upper magnetic crystal grains, formed from a material selected from the group consisting of silicon nitride, titanium oxide and titanium nitride. | 12-25-2014 |