Class 369/13.07 - Three or more magnetic layers

Subclass of Class 369 - Dynamic information storage or retrieval
Definition: Subject matter wherein there are three or more segments
No. of patents: 36
Last issue date: 05/10/2011

Number	Title	Issue Date
7941779	Methods and apparatuses for thermal analysis based circuit design Methods and apparatuses for circuit design to reduce power usage, such as reducing temperature dependent power usage, and/or to improve timing, such as reducing temperature dependent delay or transition time. At least one embodiment of the present invention reduces ...	05/10/2011
7522479	Domain wall displacement for magneto-optical recording medium having multiple magnetic layers Provided is a magnetic domain wall displacement magneto-optical recording medium having a preferable reproducing signal characteristic. The magnetic domain wall displacement magneto-optical recording medium includes at least a magnetic domain wall displacement layer...	04/21/2009
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
7336573	Method for handling interrupt request in optical storage drive When an optical storage drive executes a control procedure or operation, a method of handling an interrupt request includes utilizing the optical storage drive to receive an interrupt request from a control circuit; checking whether the interrupt request is a read c...	02/26/2008
7328447	Optical recording medium manufacturing device, method, optical recording medium, reproduction device, method, recording device, and method An optical recording medium having a plural number of recording layers includes a n-th recording layer (23) (n≧1), made up by a substrate (20) and a semi-reflective layer (21) carried by the substrate (20) and adapted for partially refl...	02/05/2008
7313063	Method of determining the time for executing optimal power calibration in an optical drive A method of determining the time for executing optimal power calibration in an optical drive. First, relationships between values of a driving signal and ambient temperatures of the optical drive are recorded in look up table in a memory. According to the look up ta...	12/25/2007
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
7224644	Head arrangement for domain expansion magnetic amplifying magneto-optical system A head arrangement for reading a magneto-optical recording medium (10) having a storage layer and a read-out layer, includes an improved field generating device for generating a magnetic field used for copying a written mark from said storage layer to said re...	05/29/2007
7210155	Magneto-optical recording medium having in-plane magnetizing layer A high-density magneto-optical recording medium having excellent jitter properties is provided. A pattern-dependent shift of the length of a recorded mark does not occur even when a minute mark has increased sensitivity to a recording magnetic field. A magneto-optic...	04/24/2007
7180831	Magneto-optical recording medium having a recording layer of columnar structure It is an object of the present invention to provide a magneto-optical recording medium including a recording film having at least a reproduction layer, an intermediate layer, and a recording layer, on an optical disk substrate, wherein the recording film is a magnet...	02/20/2007
7173884	Magnetooptic recording medium and its manufacturing method A first dielectric layer 3, a multilayer magnetic film 10 in which a first magnetic layer 4 having perpendicular magnetic anisotropy at room temperature, a second magnetic layer 5 having inplane magnetic anisotropy at room temperature, an...	02/06/2007
7126886	Magneto-optical recording medium and method for producing the same According to the present invention, a light beam is radiated to an area between recording tracks while the intensity of a magnetic field from the outside to a magneto-optical recording medium is suppressed to 50 Oe or less, whereby magnetic anisotropy formed between...	10/24/2006
7092318	Magneto-optical recording medium having a plurality of magnetic layers In a magneto-optical recording medium, a first magnetic layer is made of a material using a Gd—Fe film or a Gd—Fe—Co film as a base so that a magnetic field normalized based on saturation magnetization of a magnetic domain wall driving field can be larger than...	08/15/2006
7035138	Magnetic random access memory having perpendicular magnetic films switched by magnetic fields from a plurality of directions A magnetization reversal method is a method of applying an external magnetic field to a magnetoresistive film, in which the magnetoresistive film has a structure wherein a nonmagnetic film is placed between magnetic films with an easy axis of magnetization along a p...	04/25/2006
7012857	Magneto optical recording medium having a multilayer recording film of different thickness A magneto optical recording medium capable of stable recording and readout using a DWDD system is provided. The magneto optical recording medium of the present invention comprises an optical disk substrate and a multilayer recording film comprising essentially a rea...	03/14/2006
6980491	Domain wall displacement type magneto-optical recording medium and recording method There is provided a domain wall displacement type magneto-optical recording medium and a recording method that allow signals recorded with a high density over the limit of resolution of optical systems to be regenerated without increasing complexity of a recording a...	12/27/2005
6882617	Magnetic recording medium and method of recording In a method of recording and reproduction using a magnetic storage medium, a magnetic storage medium (5) is used in which at least magnetic recording film (2) and a superconducting film (3) are deposited. According to the method, ...	04/19/2005
6826131	Magneto-optical recording medium having multiple magnetic layers A multilayer film including a first magnetic layer, a second magnetic layer, and a third magnetic layer in the stated order is formed so that a Curie temperature TC2 of the second magnetic layer is set to be lower than a Curie temperature TC1 o...	11/30/2004
6821642	Magneto-optical recording medium with first and second magnetic layers with almost equal Curie temperatures A magneto-optical recording medium includes at least three magnetic layers of a first magnetic layer, a second magnetic layer and a third magnetic layer, in which a recording mark recorded in the third magnetic layer by irradiation of a light beam is transferred thr...	11/23/2004
6765847	Optical disk and method of magnetically separating tracks of the optical disk On a disk-shaped substrate with pits and grooves, a first dielectric layer, a magnetic layer, and a second dielectric layer are formed. A data region used for recording/reproduction includes a plurality of tracks, and is divided into a plurality of segments. Each se...	07/20/2004
6671233	Magneto-optical recording medium and reproduction method therefor A magneto-optical recording medium comprises, on a substrate, a dielectric layer, a GdFeCo reproducing layer, a non-magnetic layer, and a TbFeCo recording layer. Upon reproduction, a DC magnetic field Hex is applied in the recording direction, and a repro...	12/30/2003
6556516	Reproducing method and reproducing apparatus for magneto-optical recording medium using different radiation patterns External magnetic fields H(x) or reproducing light beams L(x) having different intensity patterns are applied to an identical recording position on a magneto-optical recording medium so that different pieces of information corresponding to the patterns ar...	04/29/2003
6532196	Magneto-optical recording medium comprising recording layer and reproducing layer In a magneto-optical recording medium comprising a recording layer and a reproducing layer, a transfer layer and a magnetic shielding layer are successively formed between the recording layer and the reproducing layer respectively. The reproducing layer i...	03/11/2003
6521357	Magneto-optical recording medium A magneto-optical recording medium including a recording layer for recording information and a substrate for supporting the recording layer is disclosed. The recording layer includes: a recording magnetic film for recording the information, the recording ...	02/18/2003
6463015	Method of reproducing information on a 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...	10/08/2002
6331966	Optical storage apparatus and recording and reproducing method of optical storage medium A calibration processing unit is provided, a reproducing operation of an optical storage medium by a reproducing unit is executed while changing a reproducing magnetic field and a reproducing laser power, a reproducible state is measured, and a set of bes...	12/18/2001
6307816	Magneto-optical recording medium, and information reproducing method using the medium A magneto-optical recording medium includes a reproducing layer, a recording layer and an intermediate layer provided between the reproducing layer and the recording layer. The reproducing layer is an in-plane magnetization film at least at room temperatu...	10/23/2001
6307819	Method of reading magneto-optical recording medium A reading method for a magneto-optical recording medium is provided, irradiating laser light as a reading beam and using a magnetic head. High density and high transmission rate are possible and a correct reading can be performed according to the length o...	10/23/2001
6122228	Magneto-optical recording medium and reproduction method therefor A magneto-optical recording medium comprises, on a substrate, a dielectric layer, a GdFeCo reproducing layer, a non-magnetic layer, and a TbFeCo recording layer. Upon reproduction, a DC magnetic field Hex is applied in the recording direction, and a repro...	09/19/2000
5909410	Optical magnetic recording medium and optical magnetic reproducing method An optical magnetic recording medium includes a first magnetic film for holding information in a status of either an upward or a downward magnetization, a second magnetic film closely adjacent to the first magnetic film and an in-plane magnetization film ...	06/01/1999
5889740	Magneto-optical recording medium and magneto-optical recording method Featured is a magneto-optical recording medium including a first magnetic layer, a second magnetic layer, a third magnetic layer and a fourth magnetic layer formed one on another in this order. The first, second, third and fourth magnetic layers have Curi...	03/30/1999
5889739	Magnetooptical recording medium and information recording and reproducing methods using the recording medium A method of recording information on and reproducing information from a magnetooptical recording medium which includes first and second magnetic layers. The method includes the step of projecting a light spot onto the medium. When reproducing information,...	03/30/1999
5814418	Magneto-optical recording medium and method for reading out information from the same In one embodiment, the magneto-optical recording medium of the present invention has a recording layer structure including at least a readout magnetic film, a control magnetic film, and a recording magnetic film. The readout magnetic film is a perpendicul...	09/29/1998
5787056	Magneto-optical recording medium with multiple magnetic layers If the Curie points of the first magnetic layer, second magnetic layer, third magnetic layer and fourth magnetic layer of alloys of rare-earth metal and transition metal as ferrimagnetic materials showing perpendicular magnetization from room temperature ...	07/28/1998
5420728	Magneto-optical recording medium including a plurality of recording layers having different curie temperatures and method of recording and reading A magneto-optic recording medium is formed from a plurality of perpendicularly magnetized thin film layers, each of which is capable of recording and reproducing information. The layers are mounted on a transparent substrate which is exposed to an inciden...	05/30/1995
5283770	Method of recording information on and reproducing information from magneto-optical recording medium A magneto-optical recording medium has a multi-layer magnetic film comprising at least a reproducing layer, a memory layer, and a recording layer which are successively deposited in magnetically coupled relationship to each other. Information is recorded ...	02/01/1994

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Class 369/13.07 - Three or more magnetic layers