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1. 发明专利

JPH11288507A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH11288507A
公开(公告)日：1999-10-19
申请号：JP5970199
申请日：1999-03-08
申请人： HITACHI LTD
发明人： SHIROISHI YOSHIHIRO , HISHIYAMA SADAO , SUZUKI HIROYUKI , TSUMITA NORIKAZU , SUGANUMA YASUO , GOHARA YOSHIO , HAYASHI MASAAKI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/73 , G11B5/738 , G11B5/704
摘要： PROBLEM TO BE SOLVED: To provide an intra-surface magnetic recording medium for a magnetic disk device which consists of a Co-Cr based magnetic thin film having excellent corrosion resistance while substantially maintaining the excellent magnetic characteristics of the magnetic metallic thin film. SOLUTION: This magnetic recording medium has a substrate, an intermediate layer formed on a substrate, a magnetic layer formed on the intermediate layer, a nonmagnetic coating film formed on the magnetic layer and a surface lubricating layer formed on the nonmagnetic coating film. The magnetic layer is composed of an alloy formed by adding at least one kind of the elements selected from Zr, V, Ti, Ru, Ni, Rh, Ta, Pd, W, Pt, Nb and Mo to an alloy consisting essentially of Co and Cr and having a content of Cr of 1 to 22 at.% of Co in such a manner that the content of one kind of these elements attains >=6 wt.%.

2. 发明专利

JPH10247314A INTRA-SURFACE MAGNETIC RECORDING MEDIUM FOR MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH10247314A
公开(公告)日：1998-09-14
申请号：JP9121598
申请日：1998-04-03
申请人： HITACHI LTD
发明人： SHIROISHI YOSHIHIRO , HISHIYAMA SADAO , SUZUKI HIROYUKI , TSUMITA NORIKAZU , SUGANUMA YASUO , GOHARA YOSHIO , HAYASHI MASAAKI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/73 , G11B5/738
摘要： PROBLEM TO BE SOLVED: To provide an intra-surface magnetic recording medium consisting of a Co-Cr based magnetic thin-film having excellent corrosion resistance while substantially maintaining the excellent magnetic characteristics of a magnetic metallic thin film. SOLUTION: The magnetic layer of this magnetic recording medium, which is constituted by forming the magnetic layer on a nonmagnetic substrate and forming an intermediate layer composed of a single substance metal or alloy consisting essentially of Cr between the magnetic layer and the nonmagnetic substrate is composed of the alloy formed by adding Ta to a Co alloy so that the magnetic layer has an exceptionally high corrosion resistance as compared with the media consisting of conventional materials while substantially maintaining the excellent magnetic characteristics of the magnetic metallic recording thin film. As a result, the intra-surface magnetic recording medium having the exceptionally higher corrosion resistance as compared with the media consisting of the conventional materials while substantially maintaining the excellent magnetic characteristics of the magnetic metallic recording thin film is obtd.

3. 发明专利

JPH10222816A THIN FILM MAGNETIC HEAD AND MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH10222816A
公开(公告)日：1998-08-21
申请号：JP2345897
申请日：1997-02-06
申请人： HITACHI LTD
发明人： TASAKA KENJI , TSUMITA NORIKAZU , FURUSAWA KENJI , TOKISUE HIROMITSU , SAIKI NORIYUKI
IPC分类号： G11B5/39
摘要： PROBLEM TO BE SOLVED: To reduce the thermal asperity (TA), which is generated by the contact between a disk and a head, to efficiently radiate the heat generated by an MR element and to improve the reproduced output by selecting the non-magnetic insulating film having a high thermal diffusion rate as the constituting material of the head element and the disk protective film. SOLUTION: In a thin film magnetic head element 10, hydrogen-containing amorphorus carbon or vapor phase synthesized diamond are used for the material of non-insulating films 104 and 106 which are located adjacent to an MR element 105 so as to greatly reduce the TA generated by the contact with a disk 2. Also silicon carbide is used for a slider material 14. Moreover, insulating films 102 ; 104 and 106 among the slider, a bottom section shield film 103, the element 105 and a top section shield film 107, a gap insulating film 108 of an inductive type head 12 and an insulating film 110, which protects the entire head, are replaced by high thermal diffusion films. Thus, the heat generated by Joule heating of the element 105 while the power is supplied is efficiently diffused and the reproduced output is increased.

4. 发明专利

JPS63187416A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS63187416A
公开(公告)日：1988-08-03
申请号：JP1717287
申请日：1987-01-29
申请人： HITACHI LTD
发明人： SHIROISHI YOSHIHIRO , HISHIYAMA SADAO , SUZUKI HIROYUKI , OONO KACHIYUKI , MATSUDA YOSHIFUMI , TAKAGI KAZUMASA , GOHARA YOSHIO , TSUMITA NORIKAZU , OURA MASAKI , HAYASHI MASAAKI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/738
摘要： PURPOSE:To obtain a magnetic recording medium which permits recording and reproducing at a high recording density and has high S/N and small modulation by forming an underlying layer of a composite underlying layer consisting of at least two layers. CONSTITUTION:The underlying layers 6, 6' on the substrate 1 side of the composite underlying layer are constituted of at least one kind of elements selected from Zr, Si, Ti, Y, Sc, Al, C, Ge, Sb, and Cu or alloys essentially consisting of at least one kind of said elements or at least one kind of oxides selected from aluminum oxide, silicon oxide, and magnesium oxide. The underlying layers 7, 7' on the magnetic layer 3, 3' side of the composite underlying layer are constituted of at least one kind of elements elected from Cr, Mo, W, Ru, Os, Pd, V, Nb, Hf, Rh, Pt, and Ir or the alloys essentially consisting of at least one kind of said elements. The magnetic recording medium which has the extremely small modulation, the high S/N, the high performance suitable for high-density recording and high reliability is thereby obtd.

5. 发明专利

JPS62239314A VERTICAL MAGNETIC RECORDING MEDIUM AND ITS PRODUCTION 失效
公开(公告)号：JPS62239314A
公开(公告)日：1987-10-20
申请号：JP7991786
申请日：1986-04-09
申请人： HITACHI LTD
发明人： SUZUKI HIROYUKI , KAMISAKA YASUTARO , TSUMITA NORIKAZU , SHIROISHI YOSHIHIRO , HISHIYAMA SADAO , YOSHIDA KAZUYOSHI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/667 , G11B5/73 , G11B5/738 , G11B5/85 , G11B5/851
摘要： PURPOSE:To obtain a film having an excellent c axis orientation property with good reproducibility by forming an intermediate layer consisting of boron or an alloy of boron and a semimetal or nitrogen-contg. boron on a substrate prior to the deposition of a Co-base alloy, and the depositing a Co-base alloy film. CONSTITUTION:The intermediate layer film consisting essentially of boron forms a fresh substrate surface for forming a Co-base alloy film, and has the desirable properties for forming a film having an excellent c axis orientation property. A substrate 1 consisting of a polyimide film is heated in vacuum, gaseous Ar is introduced, a boron target is presputtereed as the intermediate layer material, and then an intermediate layer 2 is formed at the same film forming rate by an RF conventional sputtering method. Subsequently, a vacuum is drawn in the same vacuum vessel, the temp. is lowered, gaseous Ar is further introduced, a Cr alloy target contg. 20at% Co is sputtered, then a Co-base alloy film 3 having 50nm thickness is formed at the same film forming rate by an RF magnetron sputtering method, and the vertical magnetic recording medium is produced.

6. 发明专利

JPS62226414A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS62226414A
公开(公告)日：1987-10-05
申请号：JP6832986
申请日：1986-03-28
申请人： HITACHI LTD
发明人： SUZUKI HIROYUKI , SHIROISHI YOSHIHIRO , HISHIYAMA SADAO , TSUMITA NORIKAZU , SUGANUMA YASUO , GOHARA YOSHIO , HAYASHI MASAAKI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/706 , G11B5/708 , G11B5/73 , G11B5/738
摘要： PURPOSE:To maintain excellent magnetic characteristics in a thin magnetic metallic film and to improve the corrosion resistance thereof by using Co and Ni as well as Hf for the magnetic layers formed on a nonmagnetic substrate, specifying the respective contents thereof to prescribed % and interposing an intermediate Cr layer of a prescribed thickness between the substrate and the magnetic layers. CONSTITUTION:Nonmagnetic plating layers 12, 12' consisting of Ni-P, Ni-W, etc. of the prescribed thickness are formed on the substrate 11 consisting of an Al alloy, etc., of the magnetic recording medium. Magnetic control layers 13, 13' of >=100Angstrom and =0.1at% and =10at% and

7. 发明专利

JPS61269226A PRODUCTION OF VERTICAL MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS61269226A
公开(公告)日：1986-11-28
申请号：JP11043485
申请日：1985-05-24
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KAMISAKA YASUTARO , FUTAMOTO MASAAKI , HONDA YUKIO , YOSHIDA KAZUYOSHI , TSUMITA NORIKAZU
IPC分类号： G11B5/66 , G11B5/64 , G11B5/667 , G11B5/73 , G11B5/738 , G11B5/85 , G11B5/851
摘要： PURPOSE:To make possible the production of a vertical magnetic recording medium at a high speed by forming a thin film consisting of Ti, Si and Ge by using a sputtering method and forming a vertical magnetized film consisting essentially of Co and Cr and having vertical magnetic anisotropy by using a vacuum deposition method in the stage of providing the vertical magnetized film on a thin film. CONSTITUTION:The deposition speed of the thin film consisting of the compsn. composed of >=1 kinds among Ti, Si and Ge may be lower by about one digit than the deposition speed of the thin Co-Cr film in the case of sticking continuously the former and latter films. The deposition speed of the thin film by the sputtering method is generally lower by about one digit than the deposition speed of the thin film by the vacuum deposition method. The coercive force of the Co-Cr film when the thin film consisting of the compsn. composed of >=1 kinds among Ti, Si and Ge is stuck onto a polyethylene terephthalate film by the sputtering method and further the thin Co-Cr film is stuck on the thin film by the vacuum deposition method compares favorably with the value when the latter film is stuck by the sputtering method and there is not much difference in the recording density characteristic between both films.

8. 发明专利

JPS61255533A VERTICAL MAGNETIC RECORDING MEDIUM AND ITS PRODUCTION 失效
公开(公告)号：JPS61255533A
公开(公告)日：1986-11-13
申请号：JP9592185
申请日：1985-05-08
申请人： HITACHI LTD , HITACHI MAXELL
发明人： ASADA SEIICHI , KITADA MASAHIRO , KAMISAKA YASUTARO , TSUMITA NORIKAZU
IPC分类号： G11B5/66 , G11B5/64 , G11B5/667 , G11B5/73
摘要： PURPOSE:To enhance the saturation magnetization of the titled medium and to prevent the generation of microcracks by forming a vertically magnetized film consisting essentially of an Fe-Cr alloy contg. a specified amt. of Cr and having a saturation magnetization value on a nonmagnetic substrate. CONSTITUTION:A vertically magnetized film having vertical magnetic aniso tropy, consisting essentially of an Fe-Cr alloy contg. 20-30atom% Cr and having 350-700emu/cc saturation magnetization is formed on a nonmagnetic substrate through a high-permeability magnetic material or without the material to form a magnetic recording medium. Into the magnetic recording medium,

9. 发明专利

JPS61110329A Vertical magnetic recording medium 失效
标题翻译：垂直磁记录介质
公开(公告)号：JPS61110329A
公开(公告)日：1986-05-28
申请号：JP23022784
申请日：1984-11-02
申请人： Hitachi Ltd , Hitachi Maxell Ltd
发明人： ASADA SEIICHI , SUZUKI HIROYUKI , NIIHARA TOSHIO , YOSHIDA KAZUYOSHI , SHIIKI KAZUO , FUTAMOTO MASAAKI , HONDA YUKIO , TSUMITA NORIKAZU
IPC分类号： G11B5/66 , G11B5/64 , G11B5/667 , G11B5/73 , G11B5/738
摘要： PURPOSE: To improve the magnetic characteristic of a vertically magnetizable Fe
x N film by depositing at least one intermediate film layer between a high permeability magnetic film and the Fe
x N film.
CONSTITUTION: A nonmagnetic substrate 1 is housed in an RF sputtering device and the high permeability film, intermediate film and Fe
x N film are continuously sputtered by a sputter target 2. The material of which the average nearest inter-atom distance (DCA) is 2.5W3.5Å, for example, elements such as V, Ru, Zn W etc. and the metallic nitride and metallic oxide thereof are used as the material for the intermediate film. The C-axis of the Fe
x N film is oriented perpendicularly to the film plane when such intermediate film is intervened by which the upper limit value of Bs to be formed as the vertically magnetizable film is made as high as ≥7,000G and the magnetic characteristic of the Fe
x N film is improved.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：通过在高磁导率磁性膜和FexN膜之间沉积至少一个中间膜层来提高可垂直磁化的FexN膜的磁特性。构成：将非磁性基板1容纳在RF溅射装置中，并且通过溅射靶2连续地溅射高透磁性膜，中间膜和FexN膜。平均最近的原子间距离（DCA）为2.5〜例如，使用例如V，Ru，Zn等元素及其金属氮化物和金属氧化物作为中间膜的材料。当介入这种中间膜时，FexN膜的C轴垂直于膜平面定向，使得形成为可垂直磁化膜的Bs的上限值高达> = 7,000G，并且磁特性的FexN膜改进。

10. 发明专利

JPS61110325A Vertical magnetic recording medium 失效
标题翻译：垂直磁记录介质
公开(公告)号：JPS61110325A
公开(公告)日：1986-05-28
申请号：JP22884484
申请日：1984-11-01
申请人： Hitachi Ltd , Hitachi Maxell Ltd
发明人： FUTAMOTO MASAAKI , HONDA YUKIO , KAMISAKA YASUTARO , TSUMITA NORIKAZU , YOSHIDA KAZUYOSHI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/667 , G11B5/73 , G11B5/738
摘要： PURPOSE: To obtain a high-performance magnetic recording medium having excellent vertical magnetic anisotropy by forming a thin film consisting of Se, Ge or the alloy thereof on a substrate and providing a soft magnetic material layer having a face-centered cubic lattice crystal structure and a vertically magnetizable film consisting of a Co alloy on said thin film.
CONSTITUTION: The thin nonmagnetic intermediate layer consisting of Si or Ge or SiGe alloy or consisting of the Si, Ge or SiGe alloy into which ≥1 kinds among B, SnTi and Zr are incorporated is formed on the nonmagnetic substrate 1 consisting of plastic, glass, etc. An underlying layer 3 consisting of a soft material such as Fe or Co or Fe-Si, Co-Zr-Mo or Ni-Nb-Mo consisting essentially of Ni and a thin Co alloy film layer 4 consisting of Co-Cr, Co-V, Co-Cr-Rh, etc. are formed on the layer 2. The degree of the orientation of the underlying layer is improved by the layer 2 to improve the C-axis orientability of the layer 4 on said layer by which the high-performance vertical magnetic recording medium is obtd.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：通过在基板上形成由Se，Ge或其合金构成的薄膜，得到具有优异的垂直磁各向异性的高性能磁记录介质，并提供具有面心立方晶格结构的软磁材料层，以及在所述薄膜上由Co合金构成的可垂直磁化膜。构成：由Si或Ge或SiGe合金构成或由B，SnTi和Zr中> = 1种的Si，Ge或SiGe合金组成的薄的非磁性中间层被形成在由塑料构成的非磁性基底1上，玻璃等。由基本上由Ni组成的软质材料如Fe或Co或Fe-Si，Co-Zr-Mo或Ni-Nb-Mo组成的下层3和由Co- 在层2上形成Cr，Co-V，Co-Cr-Rh等。通过层2改善下层的<111>取向度，以提高层4的C轴取向性在所述高性能垂直磁记录介质的层上。

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