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| Number | Title | Issue Date |
| 7352658 | Method for recording information data to a recording medium by irradiation with a light beam and application of a magnetic field A magnetic recording medium comprises a first magnetic film and a second magnetic film on a substrate. The second magnetic film is composed of a magnetic material preferred for recording and reproduction, and the first magnetic film is composed of a ferrimagnetic ma... | 04/01/2008 |
| 7274626 | Magneto-optical recording using a heating element A perpendicular magnetic recording medium for thermo-magnetic printing has an ultra-high recording density and is resistant to thermal decay of magnetization. An intermediate layer of the medium is provided between a first recording layer using a low-noise Co alloy ... | 09/25/2007 |
| 7235313 | Magneto-optical recording medium, method of manufacturing magneto-optical recording medium, method of recording on magneto-optical recording medium, and method of reproduction from magneto-optical recording medium A magneto-optical medium has a recording layer having a plurality of columns extending in a lamination direction, and a reproduction layer which is placed below the recording layer and which functions as a nucleus for the columns. ... | 06/26/2007 |
| 7193933 | Preheating bulk erasing device for magneto-optical disk When carrying out magnetization, annealing, and initialization of a recording film by applying a laser beam to the recording film while rotating an optical recording medium 10 by a motor 11, light of a strong visible-light lamp 15 is projected a... | 03/20/2007 |
| 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 |
| 7057989 | Device and method of recording information on an optical disc A device for recording information on an optical disc so as to improve the recording quality of the information when a recording operation has just started. The recording device includes a luminous element radiating a light for recording information on the optical d... | 06/06/2006 |
| 7027365 | Magneto-optical recording for improved domain expansion reading The present invention relates to magneto-optical recording technique whereby improved domain expansion reading is achieved. A mark region is recorded as a sub-mark portion and an adjacent sub-space portion, wherein the length of the sub-mark portion is set to be les... | 04/11/2006 |
| 6913836 | Spin-valve type magnetoresistive sensor and method of manufacturing the same A spin-valve type magnetoresistive sensor with a bias structure enabling a magnetization direction of a free magnetic layer to be uniformly arranged with certainty. The spin-valve type magnetoresistive sensor comprises an antiferromagnetic layer; a pinned magnetic l... | 07/05/2005 |
| 6018511 | Magneto-optical recording medium and readout method of the same A magneto-optical recording medium includes at least a readout magnetic film and a recording magnetic film on a substrate, wherein information is recorded onto the recording magnetic film through magnetization of the recording magnetic film thereby formin... | 01/25/2000 |
| 5982713 | Magneto-optical recording medium A magneto-optical recording medium includes first, second, and third magnetic layers laminated in this order. The first magnetic layer, made of a rare earth-transition metal alloy, has a great coercive force at room temperature and is transition metal ric... | 11/09/1999 |
| 5922177 | Magneto-optical recording medium and producing method thereof A method to produce a magneto-optical recording medium which includes a readout layer having in-plane magnetization at room temperature and in which a transition occurs from in-plane magnetization to a perpendicular magnetization when temperature rises, a... | 07/13/1999 |
| 5751669 | Overwritable magnetooptical recording method in which the recording medium is cooled after irradiation A light beam modulated according to a data signal to be recorded is irradiates a magnetooptical recording medium while moving the recording medium. During a series of recording operations, a predetermined recording area of the recording medium is heated t... | 05/12/1998 |
| 5663935 | Magneto-optical recording medium having two magnetic layers of exchange-coupled at ferromagnetic phase Binary recording is carried out with an optical recording medium having at least a recording layer, and an auxiliary layer which is in an antiferromagnetic phase at room temperature and which exhibits temperature hysteresis such that it changes upon eleva... | 09/02/1997 |
| 5657299 | Magneto-optical recording medium A magneto-optical recording medium has magnetic multi-layers including a reproductive layer, which is a magnetic layer having perpendicular magnetic anisotropy, for reading out magneto-optically recorded information and a recording layer, which is a magne... | 08/12/1997 |
| 5636187 | Magnetooptical recording apparatus and magnetooptical recording method for canceling leakage magnetic fields associated with a recording medium and devices ancillary to the recording medium In a magnetooptical recording apparatus, a magnetic field modulated in accordance with an input signal is applied to a portion of a recording medium onto which a light beam is irradiated. The magnetooptical recording apparatus includes a device for applyi... | 06/03/1997 |
| 5596555 | Magnetooptical recording medium having magnetic layers that satisfy predetermined coercive force relationships, and recording/reproduction method for the medium A magnetooptical recording medium has first and second magnetic layers laminated in that order on a transparent substrate on which a received laser beam is incident. The coercive force of the second magnetic layer is greater than that of the first magneti... | 01/21/1997 |
| 5574703 | Magneto-optical method and apparatus for recording/reproducing data 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... | 11/12/1996 |
| 5508982 | Method for recording on a magneto-optic storage medium having two recording layers A method for recording on a magneto-optic recording medium having two magneto-optic recording layers having different Curie temperatures. The magneto-optic layers must be capable of existing in two different magnetic states: a first magnetic state in whic... | 04/16/1996 |
| 5487046 | Magneto-optical recording medium having two magnetic layers with the same curie temperature A magneto-optical recording method for recording information in an overwrite mode in a magneto-optical recording medium by the application of a laser beam is disclosed. The magneto-optical recording medium includes a substrate, and at least two magnetic r... | 01/23/1996 |
| 5420833 | Magneto-optical recording medium having first and second magnetic layers A magneto-optical recording medium is composed of a first magnetic layer and a second magnetic layer, which are overlaid, each having a perpendicular magnetic anisotropy, and the first magnetic layer having a Curie temperature of Tc1, a saturat... | 05/30/1995 |
| 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 |
| 5381399 | Head shifting apparatus Disclosed is a head shifting apparatus for shifting a head relative to a recording medium, which comprises a shifting mechanism for shifting the head stepwise, detecting means for detecting when the head reaches a predetermined reference position and cont... | 01/10/1995 |
| 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 |
| 5325343 | Magneto-optical recording medium having two RE-TM layers with the same Curie temperature The medium consists of two exchange-coupled RE-TM amorphous layers (a memory layer and a reference layer) whose Curie temperatures are almost the same and only one of which is RE-rich without a compensation temperature, the two layers being laminated dire... | 06/28/1994 |
| 5265073 | Overwritable magneto-optical recording medium having two-layer magnetic films wherein one of the films contains one or more of Cu, Ag, Ti, Mn, B, Pt, Si, Ge, Cr and Al, and a method of recording on the same A magneto-optical recording medium having a first magnetic layer and a second magnetic layer having a higher curie point and a lower coercive force than those of the first magnetic layer, which magneto-optical recording medium satisfying a condition of ... | 11/23/1993 |
| 5193082 | Optical/magnetic composite head having magnetic and optical heads in one integrated unit A photomagnetic composite head comprising a magnetic head and an optical head that are integrated into one unit, an optical waveguide path of the optical head being located in the surface of the magnetic head that faces a recording medium, and a laser bea... | 03/09/1993 |
| 5164926 | Over-write capable magnetooptical recording medium with four magnetic layered structure dispensing with external initializing field A medium comprises a memory layer, a writing layer, a switching layer, and an initializing layer, these four layers consisting of perpendicularly magnetizable magnetic films being stacked in order, wherein the memory layer and the writing layer are exchan... | 11/17/1992 |
| 5132945 | Magnetooptical recording medium allowing overwriting with two or more magnetic layers and recording method utilizing the same A magnetooptical recording medium provided with a first magnetic layer and a second magnetic layer having a higher Curie point and a lower coercive force than the first magnetic layer and being exchange coupled with the first magnetic layer satisfies the ... | 07/21/1992 |
| 5106704 | Over write capable magnetooptical recording medium An over write capable magnetooptical recording medium comprises a substrate and magnetic layers including first and second layers each having a perpendicular magnetic anisotropy. In the medium, a product of a saturated magnetic moment and a coercivity of ... | 04/21/1992 |
| 5051970 | Magneto-optic recording system with overwrite capability An overwritable magneto-optic recording system has a recording medium with a substrate, a recording magnetic film and a reproducing magnetic film deposited on the substrate. The reproducing magnetic film has a Curie temperature lower than that of the reco... | 09/24/1991 |
| 4890178 | Magnetic bias coil for a magneto-optical recording apparatus An electromagnetic bias coil for applying a magnetic bias field to a recording bit of a magneto-optical recording disk apparatus includes a yoke made of soft magnetic material, such as soft iron. The yoke surrounds an outer perimeter surface and a bottom ... | 12/26/1989 |
| 4807204 | Magneto-optical recording medium having pairs of mutually corresponding recording segments, and apparatus for recording information on the medium A magneto-optical recording apparatus for writing information on a magneto-optical recording medium having at least one pair of magneto-optical storage layers each pair consisting of a first and a second storage layer which have at least one pair of corre... | 02/21/1989 |
