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1. 发明专利

JPH04247346A MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH04247346A
公开(公告)日：1992-09-03
申请号：JP1320991
申请日：1991-02-04
申请人： HITACHI LTD , HITACHI MAXELL
发明人： NAKAMURA JUNKO , KIRINO FUMIYOSHI , TAKAHASHI MASAHIKO , NIIHARA TOSHIO , SUZUKI MAKOTO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To obtain the overwritable high-density magneto-optical recording medium which allows reproduction with short wavelength light. CONSTITUTION:A magnetic layer 3 which exhibits a large Kerr rotating angle at short wavelength light is laminated as a reading out layer on a substrate 1 or dielectric film 2. This magnetic layer includes superstructure films of Pt/Co films, etc. A rare earth-iron family element alloy film is laminated thereon and the film thicknesses and magnetic characteristics thereof are controlled. Further, the dielectric layer 2 or/and metallic layer 6 are laminated as a protective layer thereon. Since sufficient C/N is obtainable at the time of reproduction with the short wavelength light, the overwriting by using the short wavelength light which is advantageous in high-density recording is possible.

2. 发明专利

JPH04179104A STRUCTURE OF MAGNETO-OPTICAL RECORDING FILM 失效
公开(公告)号：JPH04179104A
公开(公告)日：1992-06-25
申请号：JP30244490
申请日：1990-11-09
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KIRINO FUMIYOSHI , NAKAMURA JUNKO , SUZUKI MAKOTO
IPC分类号： G11B11/10 , G11B11/105 , H01F10/26
摘要： PURPOSE:To make overwriting as well as superhigh-density magneto-optical recording possible to a magneto-optical recording film by constituting the film by alternately piling up a layer made of a recording material of at least one of Pt, Pd, Rh, and Au elements and another layer made of an alloy of at least one of Pt, Pd, Rh, and Au elements and at least one of Fe and Co elements and adding at least one of Nd, Ti, Ta, Cr, and Al elements to each layer with a concentration gradient in the film thickness direction. CONSTITUTION:This magneto-optical recording film is constituted by alternately piling up an iron group element layer 2 of Co93Nb7 and precious metal element layer 3 of Pt on an optically transparent glass or plastic substrate 1. The film thicknesses of each layer 2 and 3 are respectively set at 12Angstrom and 23Angstrom and, when the total thickness of the piled up layers 2 and 3 reach 200Angstrom , the component of the iron group element layer 2' is changed from the CoNb to Co so that an Nb gradient can be obtained in the thickness direction of the recording film. The total film thickness of the recording film is set at

3. 发明专利

JPH04177639A MAGNETO-OPTIC RECORDING FILM 失效
公开(公告)号：JPH04177639A
公开(公告)日：1992-06-24
申请号：JP30244590
申请日：1990-11-09
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KIRINO FUMIYOSHI , NAKAMURA JUNKO , SUZUKI MAKOTO
IPC分类号： C23C14/06 , G11B11/10 , G11B11/105 , H01F10/26
摘要： PURPOSE:To improve a magneto-optic effect to light having short wavelength by adding a light rare earth element such as Pr, Nd, Ce, and Sm, to the alter nately laminated multilayer film of a noble metal element/iron family element. CONSTITUTION:A magneto-optic recording film having multilayer structure, in which Co75Nd25 as a metallic layer I and Pt as a metallic layer II are laminated alternately respectively, is formed onto a substrate 1 made of plastic or glass. Consequently, a magneto-optic effect to light having a short wavelength is improved. Accordingly, a fine recording magnetic domain can be formed and recorded information regenerated by using light having the short wavelength, and ultra-high density magneto-optic recording can be realized. Pd, Rh, Au may be used in place of Pt of the layer II, and the same effect is acquired even by employing Fe in place of Co in the layer I and even by using Pr, Ce, Sm in place of Nd.

4. 发明专利

JPH0453045A MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH0453045A
公开(公告)日：1992-02-20
申请号：JP15978290
申请日：1990-06-20
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KIRINO FUMIYOSHI , TAKAHASHI MASAHIKO , NAKAMURA JUNKO , MIYAMURA YOSHINORI , SUZUKI MAKOTO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To increase coercive force by forming a platinum group-transition metal multilayer film and a rare earth-transition metal film by magnetic exchange coupling and specifying the film thickness ratio of the multilayer film. CONSTITUTION:The recording film has a two-layer structure comprising a rare earth-transistion metal film 3-2 and a platinum group-transition metal multilayer film 3-1 by magnetic exchange coupling. By forming the multilayer film so that the film thickness ratio of the platinum group to the transition metal ranges from 2:1 to 5:1 and the transition metal film is made

5. 发明专利

JPH05314560A MAGNETO-OPTICAL RECORDING MEDIUM AND MAGNETO-OPTICAL RECORDING SYSTEM 失效
公开(公告)号：JPH05314560A
公开(公告)日：1993-11-26
申请号：JP5463091
申请日：1991-03-19
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KIRINO FUMIYOSHI , NAKAMURA JUNKO , SUZUKI MAKOTO , MIYAMURA YOSHINORI , TAKAHASHI MASAHIKO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To enable high-density recording by having recording films consisting of alloy layers which are provided on the side opposite from the side where reproducing light is made incident from multilayered films and have the higher perpendicular magnetic anisotropy-energy than the perpendicular magnetic anisotropy-energy of the multilayered films. CONSTITUTION:The multilayered films alternately laminated with Co as iron family element layers 2 and Pt as noble metal family element layers 3 are produced on a plastic substrate 1. The perpendicular magnetic anisotropy-energy of the recording films produced in such a manner is 1X10 erg/cm in the case of multilayered films of Pt/Co and 1X10 erg/cm in the case of rare earth-iron family element alloy layers consisting of TiFeCoNb. The magneto-optical disk 8 obtd. in such a manner is irradiated with a laser beam 10 via a substrate L and is recorded by using a floating type magnetic head 9 and by switching the direction of the impressed magnetic fields. Very small recording magnetic domains of

6. 发明专利

JPH04186706A MAGNETOOPTIC RECORDING FILM AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH04186706A
公开(公告)日：1992-07-03
申请号：JP31394190
申请日：1990-11-21
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KIRINO FUMIYOSHI , NAKAMURA JUNKO , SUZUKI MAKOTO
IPC分类号： C23C28/02 , G11B11/10 , G11B11/105 , H01F10/26 , H01F41/14
摘要： PURPOSE:To obtain a magnetooptic recording film having sufficiently large vertical magnetically anisotropic energy so as to stably store recorded information by controlling an internal stress of the film on a multilayered film. CONSTITUTION:Vertical magnetic anisotropy is controlled by controlling internal stress of a multilayered film wherein a layer made of at least one kind at element selected among Pd, Pt, Rh and Au and an alloy layer of at least one kind of element selected among Nb, Ti, Ta, Cr, Pt, Pd, Rh, Au, Nd, Pr, Tb, Dy, Ho, Gd and Sm with at least one kind of element selected among Fe, Co and Ni or at least one kind of element selected among Fe, Co and Ni are alternately layered. As a method for controlling the internal stress, there are such choices as 1) addition of elements such as W, Mo, Mn and Re to all layers or every two layers, 2) control of base temperature at the time of film formation and 3) selection of film formation conditions.

7. 发明专利

JPH04134649A MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH04134649A
公开(公告)日：1992-05-08
申请号：JP25197690
申请日：1990-09-25
申请人： HITACHI LTD , HITACHI MAXELL
发明人： NIIHARA TOSHIO , MIYAMOTO JIICHI , MIYAMOTO MAKOTO , SUZUKI YOSHIO , SUZUKI MAKOTO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To miniaturize a device without complicating the process for production by forming a 3rd magnetic layer having an easy magnetization direction within the plane to the upper part of two-layered films consisting of a 1st magnetic layer having prpendicular magnetic anisotropy and a 2nd magnetic layer. CONSTITUTION:A UV curing resin layer 2 is provided on a substrate 1. The following films are formed by sputtering thereon: The silicon nitride film 3 is first laminated. The magnetic film having a Curie temp. T1 as the 1st magnetic layer 4, the magnetic film having a Curie temp. T2(T2

8. 发明专利

JPH0573990A OPTICAL RECORDING METHOD, OPTICAL RECORDING AND REPRODUCING METHOD, OPTICAL RECORDING MATERIAL AND OPTICAL RECORDING DEVICE 失效
公开(公告)号：JPH0573990A
公开(公告)日：1993-03-26
申请号：JP4180791
申请日：1991-03-07
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KIRINO FUMIYOSHI , NAKAMURA JUNKO , SUZUKI MAKOTO , YOSHIHIRO MASASHI , YAMADA YUKINORI , OTA NORIO
IPC分类号： G11B5/02 , G11B7/007 , G11B11/10 , G11B11/105 , G11B11/14
摘要： PURPOSE:To provide the optical recording method and recording and reproducing method useful for ultra-high density recording and the optical recording member, etc., adequate thereto. CONSTITUTION:An information recording layer 5 consisting of a magnetic material having perpendicular magnetic anisotropic energy is irradiated with a laser beam to generate a change in the perpendicular magnetic anisotropic energy of the irradiated part of the magnetic material and information is recorded. In the reproduction, the change in the magnetic characteristics, such as Kerr effect is detected. The optical recording member includes alternately laminated and multilayered films of iron family elements and noble metal elements, etc.

9. 发明专利

JPH04186707A STRUCTURE OF MAGNETOOPTIC RECORDING FILM 失效
公开(公告)号：JPH04186707A
公开(公告)日：1992-07-03
申请号：JP31394290
申请日：1990-11-21
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KIRINO FUMIYOSHI , NAKAMURA JUNKO , SUZUKI MAKOTO
IPC分类号： C23C28/02 , G11B11/10 , G11B11/105 , H01F10/26
摘要： PURPOSE:To use a magnetooptic recording film having sufficiently large vertical magnetically anisotropic energy to stably store recorded information by making a magnetic feature of a ferrite magnetic body of a rare earth-iron alloy layer constituting a magnetic force together with an alternately layered multilayered film have priority in sub lattice magnetization of the rare earth element. CONSTITUTION:On a side where light for regeneration is incident, a multilayered film is provided wherein a layer made of at least one kind of element of Pt, Pd, Rh and Au and an alloy layer made of at least one kind of Fe, Co and Ni or at least one kind of Fe, Co and Ni and at least one kind of element of Pt, Pd, Rh, Au, Tb, Dy, Ho, Gd, Nd, Pr and Sm are alternately layered, and an alloy layer mainly containing rare earth elements having vertical magnetic anisotropy and iron group elements are formed on the above alloy layer so that they are magnetically coupled to each other. A magnetooptic recording film is thus formed of the above two kinds of magnetic layers. In the photomagnetic recording film of a ferrimagnetic material mainly comprising an alloy of rare earth elements and iron group elements, sub lattice magnetization of the rare earth elements is made prior.

10. 发明专利

DE69133571D1 未知
公开(公告)号：DE69133571D1
公开(公告)日：2007-07-05
申请号：DE69133571
申请日：1991-07-15
申请人： HITACHI LTD
发明人： HANAWA MAKOTO , NISHIMUKAI TADAHIKO , SUZUKI MAKOTO , SHIMOHIGASHI KATSUHIRO
IPC分类号： G06F9/38 , G06F9/00
摘要： An instruction fetch unit (640) of a data processor (610) capable of simultaneous execution of two instructions fetches a first and a second instruction from a memory (620) in one cycle. The first and the second instruction thus fetched are set in a first and a second register (641, 642) before being decoded in a first and a second instruction decoder (644, 645). Comparators (131, 132) compares data on the destination field of the first instruction with data on the source field of the second instruction. When both the data are inconsistent, a parallel operation control unit (646) permits the first and the second instruction execution unit (651, 652) under the first and the second instruction to execute the two instructions in response to the outputs of the comparators (131, 132). When both the data are consistent, the parallel operation control unit (646) inhibits the parallel execution.

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