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Class 369/13.52 - Magnetic domain wall


Subclass of Class 369 - Dynamic information storage or retrieval
Definition: Subject matter wherein the aspect involves a boundary
No. of patents: 23
Last issue date: 09/09/2008


NumberTitleIssue Date
7423939Method 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
7313055Magnetic domain wall displacement type magneto-optical recording medium
Provided is a magneto-optical recording medium capable of accurately reproducing a signal of a recording density exceeding a resolution of an optical system without making a constitution thereof complicated. The magnetic domain wall displacement type magneto-optical...
12/25/2007
7173885Domain-wall-displacement-type magnetooptical recording medium
A domain-wall-displacement-type magnetooptical recording medium is provided in which a floating magnetic field from a surrounding portion that operates on a recording/reproducing portion is suppressed. The recording medium includes a displacement layer having a comp...
02/06/2007
6985409Recording method and apparatus of domain wall displacement type magneto-optical recording medium
The present invention provides a method of recording information on a magneto-optical recording medium of domain wall displacement type having a preformat area and a data area succeeding thereto, comprising the steps of generating a reproduction signal from said med...
01/10/2006
6795379Magneto-optical medium utilizing domain wall displacement and process of reproduction
A magneto-optical medium of a domain wall displacement type is provided which does not cause inward leakage of signals caused by domain wall displacement from the rear of a reproducing light spot. The magneto-optical medium comprises a domain wall displacement layer...
09/21/2004
6747919Magneto-optical recording medium, and method and apparatus for producing the same
By irradiating a light beam between recording tracks of the magneto-optical recording medium, the magnetic anisotropy of at least one layer selected from the group consisting of the domain wall displacement layer and the recording layer formed between the recording ...
06/08/2004
6345016Signal-reproducing method and apparatus utilizing light beam generated temperature distribution and magnetic domain wall displacement
A signal reproducing method for reproducing information by domain wall displacement on a recording medium having recorded information comprises steps of projecting a light spot onto the recording medium to cause temperature distribution thereon, moving re...
02/05/2002
5680373Reproducing apparatus for magneto-optical recording device
In a magnetooptical reproducing apparatus and method, data recorded in a first layer of a magnetooptical recording medium is transcribed to a second layer by a reproduction magnetic field and is optically reproduced from the second layer....
10/21/1997
5671206Optical pickup device
An optical pickup device for recording/reproducing an optical disc having at least two data storing layers on one side thereof generates a first and second laser beams of same polarization (S-polarized beams) from a first and second laser beam sources. Th...
09/23/1997
5657299Magneto-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
5645911Over-writable method of magnetooptical recording
An over-writable method of magnetooptical recording using a magnetooptical recording medium provides a high C/N ratio in a reproduction mode, permits reduction of the intensity of the initial magnetic field at room temperature in a recording mode, and per...
07/08/1997
5585200Over write capable magnetooptical recording medium
An overwritable method of magnetooptical recording uses an over write capable magnetooptical recording medium that comprises a substrate and a magnetic layer. The magnetic layer is stacked on the substrate and includes first and second layers each having ...
12/17/1996
5508982Method 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
5462811Magneto-optical recording media and mangeto-optical device using the media
A magneto-optical recording medium comprising, on a substrate, at least a first magnetic layer made of a rare earth amorphous alloy and a second magnetic layer made of a rare earth amorphous alloy having a relatively smaller coercivity Hc2 than...
10/31/1995
5355354Non-overwritable magnetooptical recording apparatus using exchange-coupled two-layered medium with interface magnetic wall
A non-overwritable recording apparatus comprises a magnetooptical recording media including at least first and second exchange-coupled layers having perpendicular magnetic anisotrophy, the Curie temperature of the second layer being higher than that of th...
10/11/1994
5353266Magnetooptical recording method
Magnetooptical recording is effected simultaneously with an overwriting operation. A magnetooptical recording medium to be used in this method is provided with a first magnetic layer having a Curie temperature T1 and a coercive force H1
10/04/1994
5273835Over-write capable magnetooptical recording medium
A magnetooptical recording medium capable of performing an over-write operation by only modulating an intensity of a light beam without modulating a direction of a bias field is known. This invention provides a multilayered medium which has an advantage o...
12/28/1993
5265073Overwritable 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
5239532Drive arrangement for the writing/reading heads of a magneto-optical disc apparatus
A device for inscribing and/or reading a magneto-optical disc (7), including a frame (1) carrying a turntable (5) which is rotatable about an axis of rotation (11), a slide (17) carrying an optical unit (19) a rectilinear guide (15) for the slide arranged...
08/24/1993
4982389Magneto-optical recorder with compensation for variation in applied magnetic field intensity on a recording medium
A magneto-optical recorder comprising an optical head for projecting a light beam on a magneto-optical recording medium so as to form a light spot thereon, a magnetic head disposed at a predetermined distance from the optical head and applying a magnetic ...
01/01/1991
4955007Thermomagnetic recording method applying power modulated laser on a magnetically coupled double layer structure of perpendicular anisotropy film
Thermomagnetic recording method using a thermomagnetic recording medium having a superposed layer of magnetically coupled first and second magnetic thin films is disclosed. The magnetic thin film includes a portion where the respective magnetic moments of...
09/04/1990
4878132Thermomagnetic recording method applying power modulated laser on a magnetically coupled multi-layer structure of perpendicular anisotropy magnetic film
A thermomagnetic recording method is disclosed using a thermomagnetic recording medium where first, second and third magnetic thin films each formed of rare-earth and transition metals are sequentially superposed to form layers in a magnetically coupled m...
10/31/1989
4658388Optical recording medium which includes a corrosion resistant film of a mixture of a carbide and a nitride
An optical recording medium having a substrate, an optical recording layer formed on the substrate, and at least one film consisting of a carbide and a nitride and formed on the substrate....
04/14/1987
 
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