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1. 发明专利

JPS60212802A Vertical magnetic recording system 失效
标题翻译：垂直磁记录系统
公开(公告)号：JPS60212802A
公开(公告)日：1985-10-25
申请号：JP6775484
申请日：1984-04-06
申请人： Hitachi Ltd , Hitachi Maxell Ltd
发明人： KAMISAKA YASUTAROU , KITAGAMI OSAMU , HISHIYAMA SADAO , KOIZUMI MAKOTO
IPC分类号： G11B5/00 , G11B5/02 , G11B5/127
CPC分类号： G11B5/02 , G11B5/00 , G11B5/127 , G11B5/1278
摘要： PURPOSE:To set noises from the ground film of a medium to the degree of those produced when a Co-Cr single film is used, by setting the coersive force of a head making material to
摘要翻译：目的：将使用Co-Cr单层膜时产生的介质的介质膜的噪声设定为通过将制头材料的凝聚力设定为<= 0.1Oe。构成：希望作为从接地膜产生的噪声的还原方法，以最小化磁头的剩余磁性。在实用的方式中，希望降低用于使磁头的材料的矫顽力<= 0.1Oe。一般来说，磁头的剩余磁性随着矫顽力的降低而减小。因此，当使用具有较小矫顽力的磁头时，可以使从地膜产生的噪声更小。实际上，当使用具有矫顽力<= 0.1Oe的磁性物质制成的磁头时，可以将接地膜噪声抑制到与Co-Cr单层膜所产生的噪声相同的程度用过的。从图中可以清楚地看出，当使用具有<= 0.1Oe的矫顽力的磁性物质制造磁头时，接地膜的噪声与当Co-Cr单膜为用过的。

2. 发明专利

JPS59218626A Vertical magnetic recording medium 失效
标题翻译：垂直磁记录介质
公开(公告)号：JPS59218626A
公开(公告)日：1984-12-08
申请号：JP9237883
申请日：1983-05-27
申请人： Hitachi Ltd , Hitachi Maxell Ltd
发明人： KAMISAKA YASUTAROU , HISHIYAMA SADAO , KITAGAMI OSAMU
IPC分类号： G11B5/64 , G11B5/66 , G11B5/667 , G11B5/738
CPC分类号： G11B5/66
摘要： PURPOSE:To obtain a high magnetic permeability film of the ground, which causes no increase of a head recording current nor drop of a reproducing output by providing a vertical magnetized film on a high magnetic permeability material having a specified specific magnetic permeability. CONSTITUTION:A Co80Zr9.5Mo10.5 thin film is prepared by a sputter method on a glass disk, and also a Co80Cr20 thin film is provided by a sputter method. A magnetic permeability which does not cause a deterioration of a reproducing output, an increase of I90 and an increase of noise is set to a range of 100-150, from a relation of a magnitude e1k of a reproducing output in case when recording and reproducing are executed to the two layer film by using a ring head, a current value I90 for giving an output of 90% of the maximum output, a magnitude of a DC noise, and a magnetic permeability of a Co-Zr-Mo thin film.
摘要翻译：目的：为了获得地面的高磁导率膜，通过在具有特定的比磁导率的高磁导率材料上设置垂直磁化膜，不会使磁头记录电流增加或再现输出下降。构成：通过溅射法在玻璃盘上制备Co80Zr9.5Mo10.5薄膜，并通过溅射法提供Co80Cr20薄膜。在记录和再现的情况下，从再现输出的大小e1k的关系，不会导致再现输出的劣化，I90的增加和噪声的增加的磁导率被设定在100-150的范围内通过使用环形头，通过电流值I90来输出为最大输出的90％，DC噪声的大小以及Co-Zr-Mo薄膜的导磁率而被执行到两层膜。

3. 发明专利

JPS5948822A Vertical magnetic recording medium and its production 失效
标题翻译：垂直磁记录介质及其生产
公开(公告)号：JPS5948822A
公开(公告)日：1984-03-21
申请号：JP15809682
申请日：1982-09-13
申请人： Hitachi Ltd , Hitachi Maxell Ltd
发明人： KAMISAKA YASUTAROU , FUJIWARA HIDEO , HISHIYAMA SADAO , SHIIKI KAZUO
IPC分类号： G11B5/64 , G11B5/66 , G11B5/667 , G11B5/738 , G11B5/845 , G11B5/85 , G11B5/851
CPC分类号： G11B5/66
摘要： PURPOSE:To obtain a vertical magnetic recording medium of high characteristics which enables the reduction in recording current, has a large S/N and is free from spike noise by providing a thin film having high magnetic permeability, a film of a antiferromagnetic material, a film having high magnetic permeability and a vertically magnetized film in this order on a substrate. CONSTITUTION:A thin film having high magnetic permeability such as Ni80Fe20, a thin film of an anti-ferromagnetic material such as Fe50Mn50, and a thin film having high magnetic permeability such as Co80Mo9.5Zr10.5 are formed successively on an annular non-magnetic substrate, whereafter a vertically magnetized film is formed of an alloy such as Co80Cr20 thereon to 0.03-0.3mu thickness. Since the thin film of the anti-ferromagnetic material is provided between the thin films having high magnetic permeability, the generation of spike noise is eliminated and the excellent vertical magnetic recording medium having a high S/N with the decreased current necessary for recording is obtd. If an amorphous metallic film is used for the film having high magnetic permeability on the antiferromagnetic layer, better performance is obtd. The higher S/N is obtainable by applying a magnetic field in the transverse direction of tracks in the stage of forming the respective magnetic layers. The much higher S/N is obtainable if the entire part is heat treated in a vacuum or inert gas or reducing gas kept a 350- 550 deg.C after the formation of the vertically magnetized film by using both upper and lower film having high magnetic permeability of which the Curie point is higher than the heat treatment temp. and the anti-magnetic material film of which the Neel temp. is higher than said heat treatment temp.
摘要翻译：目的：为了获得能够降低记录电流的高特性的垂直磁记录介质，通过提供具有高磁导率的薄膜，反铁磁性材料的膜，反铁磁性材料的膜，具有大的S / N并且没有尖峰噪声在基板上依次具有高磁导率的膜和垂直磁化膜。构成：在环形非磁性材料上依次形成具有高导磁率的薄膜，例如Ni80Fe20，诸如Fe50Mn50的反铁磁材料的薄膜和具有高磁导率的薄膜，例如Co80Mo9.5Zr10.5 衬底，此后垂直磁化膜由Co80Cr20等合金形成，厚度为0.03〜0.3μm。由于在具有高导磁率的薄膜之间设置反铁磁材料的薄膜，所以消除了尖峰噪声的产生，并且具有高S / N的极好的垂直磁记录介质，具有记录所需的降低的电流。如果在反铁磁层上使用非晶金属膜用于具有高磁导率的膜，则可以获得更好的性能。可以通过在形成各个磁性层的阶段中在磁道的横向上施加磁场来获得较高的S / N。如果整个部件在真空或惰性气体中进行热处理，或者通过使用具有高磁性的上下薄膜形成垂直磁化膜后的还原气体保持在350-550℃，则可得到高得多的S / N 居里点的渗透率高于热处理温度。和Neel温度的抗磁材料膜。高于所述热处理温度。

4. 发明专利

JPS5963026A Vertical magnetic recording medium 失效
标题翻译：垂直磁记录介质
公开(公告)号：JPS5963026A
公开(公告)日：1984-04-10
申请号：JP17105882
申请日：1982-10-01
申请人： Hitachi Ltd , Hitachi Maxell Ltd
发明人： KAMISAKA YASUTAROU , HISHIYAMA SADAO , KITADA MASAHIRO , SHIMIZU NOBORU , TANABE HIDEO , FUJIWARA HIDEO
IPC分类号： G11B5/00 , G11B5/64 , G11B5/66 , G11B5/667 , G11B5/70 , G11B5/738 , H01F10/06 , H01F10/12 , H01F10/13 , H01F10/18 , H01F10/187
CPC分类号： G11B5/00 , G11B5/66 , G11B5/70 , Y10S428/90 , Y10T428/24975
摘要： PURPOSE:To obtain a vertical magnetic recording medium having high characteristics and generating no spike noise by interposing a thin film having high coercive force, that is, a so-called permanent magnet film between a nonmagnetic medium and a film having high magnetic permeability. CONSTITUTION:A Co80Pt20 alloy film 2 is deposited on a circular glass substrate 1 by a sputtering method, a Co80Mo9.5Zr10.5 alloy film 3 is deposited on the film 2 by the same sputtering method, and a Co80Cr20 alloy film 4 is deposited on the film 3 to manufacture a recording medium 5. In said stages, before or after forming the film 3, a radial magnetic field converging on the center of the medium 5 is applied to the medium 5 with a magnetizer 10 while rotating the medium 5. The intensity of the magnetic field applied to the medium 5 is about 100Oe on the average radius of the substrate 1.
摘要翻译：目的：为了获得具有高特性且不产生尖峰噪声的垂直磁记录介质，通过插入具有高矫顽磁力的薄膜，即在非磁性介质和具有高磁导率的膜之间的所谓永磁体膜。构成：通过溅射法将Co80Pt20合金膜2沉积在圆形玻璃基板1上，通过相同的溅射法将Co80Mo9.5Zr10.5合金膜3沉积在膜2上，并将Co80Cr20合金膜4沉积在膜3制造记录介质5.在所述阶段中，在形成薄膜3之前或之后，在旋转介质5的同时，将会聚在介质5中心的径向磁场用磁化器10施加到介质5上。施加到介质5的磁场的强度在基板1的平均半径上为大约100e。

5. 发明专利

JPS5916130A Vertical magnetization recording medium 失效
标题翻译：垂直磁化记录介质
公开(公告)号：JPS5916130A
公开(公告)日：1984-01-27
申请号：JP12434682
申请日：1982-07-19
申请人： Hitachi Ltd , Hitachi Maxell Ltd
发明人： KAMISAKA YASUTAROU , FUJIWARA HIDEO , HISHIYAMA SADAO , SHIIKI KAZUO
IPC分类号： G11B5/64 , G11B5/66 , G11B5/667 , G11B5/738 , H01F10/00
CPC分类号： G11B5/66
摘要： PURPOSE:To reduce a spike-shaped noise, by utilizing the coupling phenomenon generated on the interface between a ferromagnetic material and an anti-ferromagnetic material to suppress the generation of magnetic walls in a high-permeability magnetic material film. CONSTITUTION:It is proved by experiments that the spike-shaped noise is not generated by the interaction between the high-permeability magnetic material layer and a vertical magnetized film provided on this layer but is generated from only the high-permeability magnetic material layer. Many magnetic walls are generated in the part where the spike-shaped noise is generated. During the production of a high-permeability magnetic material film 2, ring-shaped and disc- shaped permanent magnets 4 and 5 are arranged on the outside and the inside of a substrate 1 so as to be brought into contact with the substrate, and a radial magnetic field going toward the center of the substrate is always applied to bring about the state where the generation of magnetic walls is eliminated, and continuously, an antiferromagnetic material film 6 is produced while applying an external magnetic field, thereby suppressing the generation of magnetic walls in the high-permeability magnetic material film 2. A vertical magnetized film 3 is adhered onto this film 2.
摘要翻译：目的：通过利用在铁磁材料和反铁磁材料之间的界面上产生的耦合现象来抑制高磁导率磁性材料薄膜中磁壁的产生，以减少尖峰状噪声。构成：通过实验证明，尖峰状噪声不是由高磁导率磁性材料层和设置在该层上的垂直磁化膜之间的相互作用产生的，而是仅由高磁导率磁性材料层产生。在产生尖峰状噪声的部分产生许多磁性壁。在高磁导率磁性材料膜2的制造过程中，在基板1的外侧和内侧配置有环状和圆盘状的永久磁铁4,5与基板接触，总是施加朝向基板中心的径向磁场以产生消除磁壁的产生的状态，并且连续地施加反铁磁材料膜6，同时施加外部磁场，从而抑制磁性的产生高磁导率磁性材料膜2中的壁。垂直磁化膜3粘附到该膜2上。

6. 发明专利

JP2003223708A MAGNETIC STORAGE DEVICE 审中-公开
公开(公告)号：JP2003223708A
公开(公告)日：2003-08-08
申请号：JP2003009812
申请日：2003-01-17
申请人： HITACHI LTD
发明人： YAMAMOTO TOMOO , SHIROISHI YOSHIHIRO , ISHIKAWA AKIRA , KAMISAKA YASUTARO , HISHIYAMA SADAO , OONO TSUGUYUKI , YAKU YOTSUO , OURA MASAKI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/738
摘要： PROBLEM TO BE SOLVED: To provide a multilayer magnetic recording medium and a mass high density magnetic storage device of which the S/N at high density recording and the property of recording density are excellent. SOLUTION: A magnetic recording medium has a non-magnetic substrate, a plurality of magnetic layers provided on the non-magnetic substrate, and non-magnetic intermediate layers located between the magnetic layers. Further, the medium is constituted so that respective film thicknesses of the plurality of magnetic layers differ and the respective products of the residual magnetization and thickness are substantially equal or respective residual magnetizations differ. This device is a magnetic storage device combined with the magnetic recording medium and a magnetic head using a metal thin film at least in a part of a magnetic pole or a magnetic head utilizing the magnetoresistive effect for reproducing. COPYRIGHT: (C)2003,JPO

7. 发明专利

JPH05128481A MAGNETIC RECORDING MEDIUM AND PRODUCTION THEREOF AND MAGNETIC DISK DEVICE CONSTITUTED BY USING THE MEDIUM 失效
公开(公告)号：JPH05128481A
公开(公告)日：1993-05-25
申请号：JP5681091
申请日：1991-03-20
申请人： HITACHI LTD
发明人： ISHIKAWA AKIRA , SHIROISHI YOSHIHIRO , HISHIYAMA SADAO , YAMAMOTO TOMOO , YAKU SHINAN , OONO TSUGUYUKI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/738 , G11B5/85 , G11B5/851
摘要： PURPOSE:To provide the magnetic recording medium which has uniform magnetic characteristics within a medium surface and less modulations and can make high-density recording and the method for producing such medium with good reproducibility, and the magnetic disk device of a small size and small capacity using such medium. CONSTITUTION:This medium is constituted by forming the substrate layer of a magnetic layer into a two-layered structure consisting of 1st and 2nd layers, incorporating 0.1 to 50at.% at least one kind of elements Z among oxygen, fluorine and nitrogen or incorporating 0.001 to 5at.% hydrogen into at least either of the substrate layer and the magnetic layer 14. As a result, crystal nuclei are uniformly formed with good reproducibility within the medium plane and the crystallinity and orientability are uniformed in the medium plane in the initial stage of the crystal film formation of the magnetic films. Further, the magnetic characteristics, such as coercive force and squareness ratio, are improved and the high threshold recording density and S/N are obtd. by setting the content of the Z elements in the substrate layer 16 at the above-mentioned range.

8. 发明专利

JPH02168418A IN-PLANE MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE 失效
公开(公告)号：JPH02168418A
公开(公告)日：1990-06-28
申请号：JP24913789
申请日：1989-09-27
申请人： HITACHI LTD
发明人： SHIROISHI YOSHIHIRO , YAMASHITA TAKEO , HISHIYAMA SADAO , KUMASAKA TAKAYUKI , MATSUDA YOSHIFUMI , SUZUKI HIROYUKI , TAKAGI KAZUMASA , TSUMITA NORIKAZU , OURA MASAKI , ONO SHIGEYUKI
IPC分类号： G11B5/716 , G11B5/64 , G11B5/66 , G11B5/73 , G11B5/738 , G11B11/10 , G11B11/105
摘要： PURPOSE:To make the recording and reproduction with high density stable by coupling all magnetic films being a composite magnetic film magnetically, providing a sole planer coercive force and increasing the planer coercive force of the magnetic film closest to the information recording layer side. CONSTITUTION:Magnetic thin films 12, 12' at the base side, magnetic thin films 13, 13' at the information recording side and nonmagnetic protection coating layers 14, 14' are formed on a nonmagnetic base 11 to form a magnetic disk. Through the constitution above, all the magnetic films being components of the composite magnetic film are coupled magnetically. Moreover, the composite magnetic film has a sole planer coercive force. Furthermore, the planer coercive force is selected to be larger than the planer coercive force of an in-plane magnetic anisotropic magnetic film being a component of the magnetic film close to the information recording side in the magnetic films being components of the composite magnetic film. Thus, high orientation, high output and low noise are attained even at high density recording. Thus, a large capacity of the magnetic recording device is attained and the size is made small.

9. 发明专利

JPH02152012A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH02152012A
公开(公告)日：1990-06-12
申请号：JP30607888
申请日：1988-12-05
申请人： HITACHI LTD
发明人： MATSUOKA SHINYA , OURA MASAKI , SHIROKURA TAKAAKI , SHIROISHI YOSHIHIRO , HISHIYAMA SADAO
IPC分类号： G11B5/706 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/738
摘要： PURPOSE:To obtain a magnetic recording medium in which high density recording/reproducing can be possible by optimizing the magnetic anisotropy in the magnetic recording medium. CONSTITUTION:In the magnetic recording medium, nonmagnetic base layers 12, 12', magnetic recording layers 13, 13', nonmagnetic protective layers 14, 14' are successively formed on the nonmagnetic substrate 11. The squareness ratio of the magnetization curve of the medium along the traveling direction of a head is specified to from 0.35 to 0.65, and more preferably, from 0.4 to 0.6. With small squareness ratio of the in-plane magnetization curve, magnetization in a recorded state is not always needed to orient strictly to the recording direction, so that the total energy of antimagnetic field and magnetic walls in a magnetization transition region can be concentrated in a narrower region. Thereby, high density recording/reproducing can be possible and the medium noise due to fluctuation of magnetization in the magnetization transition region can be reduced. Thus, a magnetic recording/reproducing device with large capacity can be produced.

10. 发明专利

JPH0249214A MAGNETIC RECORDING MEDIUM AND MAGNETIC MEMORY DEVICE 失效
公开(公告)号：JPH0249214A
公开(公告)日：1990-02-19
申请号：JP19791988
申请日：1988-08-10
申请人： HITACHI LTD
发明人： SHIROISHI YOSHIHIRO , HISHIYAMA SADAO , MATSUDA YOSHIFUMI , SUZUKI HIROYUKI , OONO TOMOYUKI , YAKU SHINAN , TAKAGI KAZUMASA , TSUMITA NORIKAZU , OURA MASAKI , SHIGE NORIYUKI
IPC分类号： G11B5/66 , C09D171/02 , G11B5/64 , G11B5/65 , G11B5/706 , G11B5/738
摘要： PURPOSE:To obtain the medium which has excellent corrosion resistance, is small in noise at the time of high-density recording and reproducing and has high S/N by incorporating Co into a magnetic layer and incorporating prescribed elements further into the layer. CONSTITUTION:Metallic underlying layers 11, 11' consisting of Cr, Mo, W, etc., are provided on a nonmagnetic substrate 10 consisting of tempered glass, etc. This medium has the magnetic layers 12, 12.. of the magnetic alloy contg. the material X consisting of at least >=1 kinds of the elements selected from a 1st group contg. Co and consisting of Cr, Mo, and W, the material Y' consisting of at least >=1 kinds of the elements selected from a 2nd group consisting of Ti, Zn, Hf, Ta, Nb, Ru, and Rh, and the material Z consisting of at least >=1 kinds of the elements selected from a 3rd group consisting of Al and Si. Nonmagnetic coating layers 13, 13' consisting of C, B, Si, Ti, etc., are formed thereon and lubricating layers 14, 14' consisting of perfluoroalkyl polyether, etc., are provided thereon. The medium which decreases the noises and has the high S/N at the time of high-density recording and reproducing is obtd. in this way and the reduction of the size of the device and the increase of the capacity thereof are possible.

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