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| Number | Title | Issue Date |
| 7289298 | Perpendicular magnetic recording medium, method for manufacturing the same, and magnetic recording/reproducing apparatus Disclosed is a magnetic recording medium which includes a substrate, an underlayer, and a perpendicular magnetic recording layer, and in which this perpendicular magnetic recording layer contains magnetic crystal grains and a matrix surrounding the magnetic crystal ... | 10/30/2007 |
| 7252896 | Magnetic recording medium and magnetic recording/reproducing apparatus An orientation control layer having a granular structure is formed between a substrate and magnetic recording layer, contains a base material and grains dispersed in the base material, and having a thickness smaller than a grain size of the grains. ... | 08/07/2007 |
| 7166376 | Magnetic recording medium including a high-magnetostriction layer and magnetic recording/reproducing apparatus A multi-layer including a magnetic recording layer and a high-magnetostriction layer having a magnetostriction constant larger than that of the magnetic recording layer is formed. ... | 01/23/2007 |
| 7166375 | Magnetic recording medium utilizing a multi-layered soft magnetic underlayer, method of producing the same and magnetic recording and reproducing device A magnetic recording medium, a method for producing the same, and a magnetic recording and reproducing device are provided which can prevent spike noise and improve the error rate. The magnetic recording medium comprises at least one nonmagnetic substrate, a soft ma... | 01/23/2007 |
| 7141316 | Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus Disclosed is a perpendicular magnetic recording medium in which an undercoating layer having crystal grains and a grain boundary material containing a carbide or boride is formed below a perpendicular magnetic recording layer, and another undercoating layer containi... | 11/28/2006 |
| 7138194 | Magnetic recording medium, method of manufacture therefor, and magnetic read/write apparatus The magnetic recording medium comprises a soft magnetic undercoat film, an orientation control film that controls the orientation of a film provided directly above, a perpendicular magnetic film of which axis of easy magnetization is generally oriented perpendicular... | 11/21/2006 |
| 7132176 | Perpendicular magnetic recording medium and magnetic recording/reproduction apparatus A perpendicular magnetic recording medium includes a magnetic recording layer stacked on a substrate and having a first perpendicular magnetic recording layer containing cobalt, and a second perpendicular magnetic recording layer mainly containing a crystalline allo... | 11/07/2006 |
| 7105239 | Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus using the same In a magnetic recording medium, a longitudinal hard magnetic layer, interlayer, longitudinal soft magnetic layer, and magnetic recording layer are multilayered on a substrate. The interlayer is one of a magnetic layer having saturation magnetization smaller than tha... | 09/12/2006 |
| 7056606 | Magnetic recording medium, method manufacture therefor, and apparatus for magnetic reproducing and reproducing recordings A magnetic recording medium comprising: on a non-magnetic substrate, at least a soft magnetic undercoat film comprising a soft magnetic material; an orientation control film for controlling an orientation of a film directly above; a perpendicular magnetic film in wh... | 06/06/2006 |
| 7033684 | Magnetic recording medium, method of manufacture thereof, and magnetic read/write apparatus A magnetic recording medium comprising at least a soft magnetic layer, an orientation control film that controls the orientation of a film provided directly thereabove, an intermediate film, a perpendicular magnetic recording film of which the axis of easy magnetiza... | 04/25/2006 |
| 6942936 | Perpendicular magnetic recording medium and magnetic recording/reproduction apparatus A medium having at least a nonmagnetic substrate, soft magnetic backing layer, soft magnetic underlayer, and perpendicular magnetic recording layer, and An oxidized layer of the soft magnetic backing layer is also formed on the soft magnetic backing layer, and the s... | 09/13/2005 |
| 6902835 | Perpendicular magnetic recording medium and magnetic recording apparatus A double layered perpendicular recording media having, between a soft magnetic layer and perpendicular magnetic recording layer, an alignment control layer containing an amorphous portion, a crystal size control layer, and an underlayer having one of a hexagonal clo... | 06/07/2005 |
| 6884519 | Magnetic recording medium, including an HCP structured Ni-alloy control film method of manufacture therefor, and magnetic read/write apparatus A magnetic recording medium having excellent magnetic read/write characteristics and thermal stability characteristics, and a method of manufacturing therefor, and a magnetic read/write apparatus are provided. This magnetic recording medium comprises an orientation ... | 04/26/2005 |
| 6846581 | Perpendicular magnetic recording medium and magnetic recording-reproducing apparatus using the same Disclosed is a perpendicular magnetic recording medium, comprising a nonmagnetic substrate, a longitudinal hard magnetic multi-layered film arranged on the nonmagnetic substrate, including a nonmagnetic intermediate layer and a pair of hard magnetic layers laminated... | 01/25/2005 |
| 6805981 | Perpendicular magnetic recording medium and perpendicular magnetic recording-reproducing apparatus A perpendicular magnetic recording medium comprising a layer exhibiting a super paramagnetism is used as the underlying film to enable the recording medium to achieve a high density recording with a low noise. ... | 10/19/2004 |
| 6754020 | Magnetic recording media and magnetic recording/reproduction apparatuses Magnetic recording media with thermal fluctuation resistance and low noise made compatible are obtained by using as magnetic layers a combination of a first magnetic material having a first Curie point higher than the recording temperature and a second magnetic mate... | 06/22/2004 |
| 6723458 | Magnetic recording medium, method of manufacture therefor, and magnetic read/write apparatus A magnetic recording medium that is capable of recording and reading back information at a higher density by improving the read/write characteristics and thermal stability, a method of manufacture therefor, and a magnetic read/write apparatus are provided. This magn... | 04/20/2004 |
| 6713197 | Perpendicular magnetic recording medium and magnetic recording apparatus A soft magnetic laminate layer is arranged between a nonmagnetic substrate and a perpendicular magnetic recording layer so as to provide a perpendicular magnetic recording medium low in noise and capable of a high density recording. The soft magnetic laminate layer ... | 03/30/2004 |
| 6699600 | Magnetic recording medium, method of manufacture therefor, and apparatus for magnetic recording and reproducing recordings A magnetic recording medium comprising: on a non-magnetic substrate, at least a soft magnetic undercoat film comprising a soft magnetic material; an orientation control film for controlling an orientation of a film directly above; a perpendicular magnetic... | 03/02/2004 |
| 6670056 | Perpendicular magnetic recording medium and magnetic read/write apparatus Disclosed is a perpendicular magnetic recording medium having magnetic characteristics by which an anisotropic magnetic field Hk and a saturation magnetization Ms satisfy the requirement 2 | 12/30/2003 |
| 6620533 | Magnetic recording medium By using a magnetic recording medium in which the value of Hk/4πMs calculated from the anisotropic magnetic field Hk and the saturation magnetization Ms falls within a range of more than 2 and less than 5, the resistance to the thermal decay can be impro... | 09/16/2003 |
| 6548194 | Perpendicular magnetic recording medium and a magnetic reproducing apparatus Disclosed is a magnetic recording medium having a laminate structure comprising at least a substrate, a Co alloy bias layer, a soft magnetic layer, and a magnetic recording layer. The direction of residual magnetization of the Co alloy bias layer faces on... | 04/15/2003 |
| 6128166 | Magnetic head for increasing track density of a magnetic disk According to this invention, there is provided a magnetic recording/reproducing system having a recording head for recording a signal in a magnetic recording medium along recording tracks having a predetermined track pitch and a reproducing head for repro... | 10/03/2000 |
| 5981054 | Magnetic recording medium and method for manufacturing the same A magnetic recording medium comprising a substrate and a magnetic film formed on the substrate, the magnetic film including magnetic crystal grains in a non-magnetic matrix and satisfying the condition given below: d2 .multidot.t.multidot.Ir/(v.mult... | 11/09/1999 |
| 5942342 | Perpendicular recording medium and magnetic recording apparatus A magnetic recording apparatus comprising a perpendicular recording medium, a recording head for perpendicular magnetization the perpendicular magnetization film of the recording medium, to thereby recording signals on the recording medium, and a reproduc... | 08/24/1999 |
| 5909341 | Hard disk drive A hard disk drive includes a magnetic disk used as a magnetic recording medium, and a magnetic head for applying magnetic fields to the disk to record data and for detecting magnetic fields from the disk to reproduce data. During recording and reproducing... | 06/01/1999 |
| 5830569 | Magnetic recording medium containing CoPtO-based alloy magnetic film A magnetic recording medium of this invention includes an underlayer formed on a substrate and made of a material containing vanadium as a main constituent, and a magnetic film formed on the underlayer and made of a CoPtO-based alloy. Another magnetic rec... | 11/03/1998 |
| 5825596 | Hard disk drive A hard disk drive includes a magnetic disk used as a magnetic recording medium, and a magnetic head for applying magnetic fields to the disk to record data and for detecting magnetic fields from the disk to reproduce data. During recording and reproducing... | 10/20/1998 |
| 5792564 | Perpendicular recording medium and magnetic recording apparatus A longitudinal recording medium and a magnetic recording apparatus containing the same, comprising a substrate and a longitudinal magnetization film formed on the substrate containing grains of a Co-based alloy, and exhibiting an oxygen concentration dist... | 08/11/1998 |
| 5486967 | Magnetic disk memory system According to the present invention, there is provided a magnetic disk memory system. An embodiment of this system comprises a magnetic disk of a perpendicular recording type, including a soft magnetic backing layer and a magnetic recording layer of a perp... | 01/23/1996 |
| 5434014 | Magnetic recording medium and method of manufacturing same A thin film type longitudinal magnetic recording medium is manufactured by forming a magnetic layer of Co1-x-y Ptx Cry, (0.15 | 07/18/1995 |
| 4762742 | Perpendicular magnetic recording medium A perpendicular magnetic recording medium comprises a base having a main surface and form, and a magnetic layer formed on the main surface, and having a recording surface, formed with a number of fine projections, and a susceptible axis substantially perp... | 08/09/1988 |
