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| Number | Title | Issue Date |
| 7423939 | Method for manufacturing magneto-optical recording medium A method for manufacturing a magneto-optical recording medium in which reading of recorded information is performed through domain wall displacement in a reproduction layer is provided, in which magnetic separation of groove side-wall portions is performed more reli... | 09/09/2008 |
| 7247397 | Thermally stable perfluoropolyether lubricant for recording media The invention provides a lubricant useful in magnetic recording media and optical recording media comprising a functionalized perfluoropolyether comprising multiple acrylate endgroups. More specifically, the lubricant of the invention is a functionalized perfluoropo... | 07/24/2007 |
| 7164623 | Magneto-optical recording medium The present invention provides a magneto-optical recording medium including a recording layer, an intermediate layer and a reproducing layer stacked in this order. Information recorded in the recording layer is transferred to the reproducing layer through the interm... | 01/16/2007 |
| 7161876 | Magneto-optical recording medium, and method for recording information in a recording layer A magneto-optical recording medium includes a substrate and a reproducing layer and a recording layer provided on the substrate. A recording magnetic domain is provided in the recording layer by heating the recording layer by irradiation with light and applying a re... | 01/09/2007 |
| 7110327 | Magneto-optical recording and reproducing method, using reproducing layer with high saturation magnetization A magnetic recording medium comprises, on a substrate, a recording auxiliary layer, a recording holding layer, recording control layer, and a recording layer. The recording layer is constructed by using a ferri-magnetic material having perpendicular magnetization. T... | 09/19/2006 |
| 7101593 | Method for producing a disk-shaped substrate and method for producing an optical disk A method for producing a disk-shaped substrate 10 used for producing an optical disk includes: (a) forming a protective layer 12a that is larger in area than the disk-shaped substrate 10 on a surface of a transparent plate 11a | 09/05/2006 |
| 7038873 | Magnetic recording medium having a specific relation of coercive force HC and residual magnetization MR in perpendicular direction to substrate surface A perpendicular magnetic recording medium has a substrate, a magnetic functional layer provided on the substrate, and a magnetic recording layer stacked in contact with the magnetic functional layer and having perpendicular magnetic anisotropy. −4×2πMs2 | 05/02/2006 |
| 6996052 | Optical information recording medium and optical recording method An optical information recording medium for recording information by a plurality of record mark lengths, wherein the shortest mark length is at most 0.5 μm, and a crystal state is an unrecorded or erased state and an amorphous state is a recorded state, wherein the... | 02/07/2006 |
| 6975047 | Temperature-based cooling device controller apparatus and method A temperature-based cooling device controller is implemented in an integrated circuit such as a microprocessor. The temperature-based cooling device controller includes a register to store a threshold temperature value, a thermal sensor, and clock adjustment logic t... | 12/13/2005 |
| 6914254 | Apparatus for manufacturing evaluation reference tape The evaluation reference tape includes at least one recess formed on a magnetic recording layer of a magnetic tape by processing the magnetic recording layer. In the method and apparatus for manufacturing the magnetic recording layer, at least one recess is formed o... | 07/05/2005 |
| 6844083 | Magneto-optical recording medium possessing a magnetic assist layer A magneto-optical recording medium has a configuration such that information recorded can be read from a region smaller than a beam spot by applying an external magnetic field and directing a light beam in reproducing. The magneto-optical recording medium includes a... | 01/18/2005 |
| 6770387 | Magneto-optical recording medium and method of reproducing the same A magneto-optical recording medium comprising four magnetic layers including a mask layer, a reproduction layer, an intermediate layer and a recording layer, wherein the reproduction layer and the recording layer each have a direction of easy magnetization extending... | 08/03/2004 |
| 6767656 | Magneto-optical recording medium and method of reproducing the same A magneto-optical recording medium comprising four magnetic layers including a mask layer, a reproduction layer, an intermediate layer and a recording layer, wherein the reproduction layer and the recording layer each have a direction of easy magnetization extending... | 07/27/2004 |
| 6665235 | Magneto-optical recording medium and recording and reproducing method and optical head designed for the magneto-optical recording medium Featured is a recording and reproducing method of a magneto-optical recording medium including a recording layer for recording thereon information magneto-optically and a readout layer which has in-plane magnetization at room temperature and where a trans... | 12/16/2003 |
| 6649285 | Magneto-optical recording medium and manufacturing method therefor A magneto-optical recording medium includes a magnetic reproducing layer having an axis of easy magnetization in a direction perpendicular to its layer surface, a magnetic intermediate layer formed on the magnetic reproducing layer and having an axis of e... | 11/18/2003 |
| 6633514 | Magneto-optical reproducing method using a plural of different reproducing beams A magneto-optical recording medium has magneto-optical recording layers (11, 12, 13) and reproducing layers (21, 22, 23). The information recorded in the reproducing layers are reproduced by means of reproducing light beams (31, 32, 33) of different wavel... | 10/14/2003 |
| 6477120 | Magneto-optical recording medium In order to provide a magneto-optical recording medium which can select a single recording magnetic domain in the recording layer accurately and expand and transfer the same to the reproducing layer, the magneto-optical recording medium is arranged in the... | 11/05/2002 |
| 6377414 | Magnetic media patterning utilizing heat-induced phase transition Patterned magnetic media are provided at high resolution and pattern definition by a process comprising steps of: applying to a magnetic layer a first uniform magnetic field of a first direction and strength to pre-align the magnetic grains thereof; apply... | 04/23/2002 |
| 6261707 | Magneto-optical recording medium and recording and reproducing method and optical head designed for the magneto-optical recording medium A magneto-optical recording medium is composed of a base which has a property that a light can be transmitted therethrough, a readout layer formed on the base, which has in-plane magnetization at room temperature, whereas, a transition occurs from in-plan... | 07/17/2001 |
| 6187460 | Magneto-optical recording medium and method for reproducing information therein A magneto-optical recording medium includes a first magnetic layer and a second magnetic layer. The first magnetic layer is a horizontal magnetization layer at room temperature but a perpendicular magnetization layer at a raised temperature. A transition ... | 02/13/2001 |
| 5968678 | Magneto-optical recording medium and manufacturing method thereof In magneto-optical recording medium, on a transparent substrate of polycarbonate resin, an SiN film having the thickness of 600 to 800 Å and surface roughness Rmax of at most 10 nm is formed. On the SiN film, a GdFeCo reading layer having the thickness o... | 10/19/1999 |
| 5926444 | Magneto-optical recording medium for achieving super resolution reproduction of high resolution recorded information A magneto-optical recording medium of the present invention has a recording layer made of a perpendicular magnetization film, and a readout layer which is in an in-plane magnetization state at room temperature and changes into a perpendicular magnetizatio... | 07/20/1999 |
| 5815469 | Magneto-optical recording device having recording magnetic field in the same direction as reproducing magnetic field To directly overwrite data on a magnito-optical recording medium formed of two exchange-coupled magnetic layers of a memory layer with a high coercive force and a low Curie point and a reference layer with a low coercive force and a high Curie point, an i... | 09/29/1998 |
| 5764601 | Method of manufacturing a magneto-optical recording medium having a readout layer with varying composition and curie temperature A magneto-optical recording medium includes a readout layer has in-plane magnetization at room temperature and in which a transition occurs from in-plane magnetization to perpendicular magnetization when temperature thereof is raised, and a recording laye... | 06/09/1998 |
| 5710746 | Magneto-optical recording medium and reading method with magnetic layers of different coercivity A magneto-optical disc (1) includes a write/read magnetic layer (4) with high coercivity on a substrate (2) and an auxiliary magnetic layer (6) with low coercivity thereon in a magnetostatically coupled manner. Both the magnetic layers are recorded. Prior... | 01/20/1998 |
| 5656384 | Magnetooptical recording medium, method for producing the same, method for recording or reproducing information in or from the same A magnetooptical recording medium for information recording and information reproduction includes plural thin films, including at least a reproducing layer and a recording layer, laminated on a substrate. The reproducing layer is composed of a magnetic th... | 08/12/1997 |
| 5592445 | Exchange coupling optical recording medium and recording/reproducing device therefor A magneto-optical recording medium includes: a mask layer having a first compensation temperature higher than a predetermined reproduction temperature and lower than a predetermined first recording temperature, a first Curie temperature higher than a pred... | 01/07/1997 |
| 5563852 | Magneto-optical recording medium having a readout layer with varying composition and curie temperature A magneto-optical recording medium includes a readout layer has in-plane magnetization at room temperature and in which a transition occurs from in-plane magnetization to perpendicular magnetization when temperature thereof is raised, and a recording laye... | 10/08/1996 |
| 5539709 | Magnetooptical recording method and apparatus using multi-layered media A magnetooptical recording method for recording data using a bit having upward-magnetization and a bit having downward-magnetization on a recording layer of a magnetooptical recording medium comprises the steps of using, as the medium, a multilayered magn... | 07/23/1996 |
| 5450382 | Magneto-optical recording medium having a layer that retains its state of magnetization regardless of the presence of an external magnetic field, and a recording/reproducing method therefor A magneto-optical recording medium has at least a first magnetic layer and a second magnetic layer which are mutually exchange-coupled. The first magnetic layer has a compensation temperature within a range higher than a room temperature but lower than th... | 09/12/1995 |
| 5384758 | Reproduction-only magneto-optical disk with selectively exchange coupled layers, and reproduction method and reproduction apparatus therefor A reproduction-only magneto-optical disk has first and second magnetic layers. First micro areas 댐 where an exchange coupling force acts between the two magnetic layers, and second micro areas 댑 where no exchange coupli... | 01/24/1995 |
| 5367507 | Over write capable magnetooptical recording method, and magnetooptical recording apparatus and medium used therefor A magnetooptical recording method for recording data using a bit having upward-magnetization and a bit having downward-magnetization on a recording layer of a magnetooptical recording medium comprises the steps of using, as the medium, a multilayered magn... | 11/22/1994 |
| 5329505 | System and method for overwriteable magneto-optical recording A system and method for overwriteable magento-optical recording comprises a medium having a data layer and a reference layer. The medium is heated with a laser pulse of short duration which causes a temperature gradient between the data layer and the refe... | 07/12/1994 |
| 5265074 | Magneto-optical recording medium A magneto-optic recording and reproducing medium is formed of a reproduction layer composed mainly of GdFeCo and having a saturation magnetization of at least 450 emu/cc and a coercive force of not more than 4 kOe, and a recording layer composed mainly of... | 11/23/1993 |
| 5233578 | Method of recording information on a recording medium having at least two magnetic layers Disclosed is a method of recording information on a magnetooptical recording medium, which medium includes a first magnetic layer and a second magnetic layer having a lower Curie temperature and a higher coercive force at room temperature than those of th... | 08/03/1993 |
| 5210724 | Optomagnetic recording method and apparatus which precludes an interface magnetic wall within block magnetic wall An information recording method, which performs recording of an information by use of an optical magnetic recording medium provided with a first magnetic layer and a second magnetic layer having higher Curie point and lower coercive force at room temperat... | 05/11/1993 |
| 5184335 | Method and system for erasing previously recorded domains in a magneto-optic recording medium Methods for directly over-writing the binary data value of a bit of digital data, stored in a particular one of a multiplicity of microscopic storage regions of a thin-film magneto-optic recording layer, in the absence of a substantial externally applied ... | 02/02/1993 |
| 4932012 | Method for regenerating information from a magneto-optical information recording medium There is disclosed a magnetooptical recording medium provided with at least a recording layer and a reading layer both composed of magnetic layers showing vertical magnetic anisotropy, in which the recording layer has a higher coercive force and a lower C... | 06/05/1990 |
| 4858212 | Recording method on magnetooptical disc with laser magnetic field A magnetooptical disc is initialized by reversing the direction of magnetization at fixed intervals and the direction of external magnetic field applied to it is reversed for each overwrite recording by exposure to laser light.... | 08/15/1989 |
| 4855975 | Over write capable magnetooptical recording method using two beams, and magnetooptical recording apparatus therefor A magnetooptical recording method for recording data using a bit having upward-magnetization and a bit having downward-magnetization on a recording layer of a magnetooptical recording medium comprises the steps of using, as the medium, a multilayered magn... | 08/08/1989 |
