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1. 发明专利

SG67390A1 Magnetic recording media and magnetic recording system using the same 未知
公开(公告)号：SG67390A1
公开(公告)日：1999-09-21
申请号：SG1997001600
申请日：1997-05-20
申请人： HITACHI LTD
发明人： YAHISA YOTSUO , HOSOE YUZURU , TANAHASHI KIWAMU , KANBE TETSUYA , MATSUDA YOSHIBUMI , ISHIKAWA AKIRA , KATAOKA HIROYUKI , ONO TOSHINORI , TAMAI ICHIRO , FUKAYA SHINJI , URA KAZUHIRO , ENDO NAOTA , YAMAMOTO TOMOO
IPC分类号： G11B5/012 , G11B5/39 , G11B5/66 , G11B5/73 , G11B5/64 , G11B5/02 , G11B5/84
摘要： A magnetic recording system includes an in-plane magnetic recording medium having a magnetic layer fabricated on a single underlayer or on a plurality of underlayers respectively fabricated on a substrate; a driver unit for driving the in-plane magnetic recording medium in a write direction; a magnetic head having a read unit and a write unit; a unit for moving the magnetic head relative to the in-plane magnetic recording medium; and a read/write signal processing unit for reading an output signal from the magnetic head and writing an input signal to the magnetic recording media, wherein the read unit of the magnetic head is a magnetoresistive head and the single underlayer or at least one of the plurality of underlayers is made of Co-containing amorphous material or fine crystal material, or is made of alloy material, the alloy material having as the main components at least one element selected from a group consisting of Cr, Mo, V and Ta and containing at least one element selected from a group consisting of B, C, P and Bi. The magnetic recording system can be realized which can read and write high density information and have high reliability.

2. 发明专利

DE69709575D1 未知
公开(公告)号：DE69709575D1
公开(公告)日：2002-02-21
申请号：DE69709575
申请日：1997-05-16
申请人： HITACHI LTD
发明人： KANBE TETSUYA , ISHIKAWA AKIRA , TAMAI ICHIRO , YAHISA YOTSUO , HOSOE YUZURU , TANAHASHI KIWAMU , MATSUDA YOSHIBUMI , KATAOKA HIROYUKI , ONO TOSHINORI , FUKAYA SHINJI , URA KAZUHIRO , ENDO NAOTO , YAMAMOTO TOMOO
IPC分类号： G11B5/00 , G11B5/012 , G11B5/39 , G11B5/66 , G11B5/73 , G11B5/64
摘要： A magnetic recording system includes an in-plane magnetic recording medium (4) having a magnetic layer (23) fabricated on a single underlayer or on a plurality of underlayers (21 - 22) respectively fabricated on a substrate (20); a driver unit for driving the in-plane magnetic recording medium in a write direction; a magnetic head (1) having a read unit and a write unit; a unit (2) for moving the magnetic head relative to the in-plane magnetic recording medium; and a read/write signal processing unit for reading an output signal from the magnetic head and writing an input signal to the magnetic recording media, wherein the read unit of the magnetic head is a magnetoresistive head and the single underlayer or at least one (21) of the plurality of underlayers is made of Co-containing amorphous material or fine crystal material, or is made of alloy material, the alloy material having as the main components at least one element selected from a group consisting of Cr, Mo, V and Ta and containing at least one element selected from a group consisting of B, C, P and Bi. The magnetic recording system can be realized which can read and write high density information and have high reliability.

3. 发明专利

SG50883A1 Longitudinal magnetic recording medium having a multi-layered underlayer and magnetic storage apparatus using such magnetic recording medium 未知
公开(公告)号：SG50883A1
公开(公告)日：1998-07-20
申请号：SG1997003219
申请日：1997-09-03
申请人： HITACHI LTD
发明人： TANAHASHI KIWAMU , HOSOE YUZURU , TAMAI ICHIRO , KANBE TETSUYA , YAMAMOTO TOMOO
IPC分类号： G11B5/66 , G11B5/012 , G11B5/39 , G11B5/64 , G11B5/667 , G11B5/73 , G11B5/738 , G11B5/708 , G11B5/70
摘要： A longitudinal magnetic recording medium and a magnetic storage apparatus using the longitudinal magnetic recording medium. The recording medium has a multi-layered underlayer and a magnetic layer formed on it. The underlayer has a first layer of a body-centered cubic structure, a second layer of a hexagonal-close packed structure formed on the first layer, and a third layer of a bcc structure formed on the second layer. The underlayer may further have a fourth layer of an hcp structure layer formed on the third layer.

4. 发明公开

EP0809238A3 Magnetic recording media and magnetic recording system using the same 失效
标题翻译：一种磁记录介质，和所述支撑用磁记录系统
公开(公告)号：EP0809238A3
公开(公告)日：1998-07-08
申请号：EP97108035
申请日：1997-05-16
申请人： HITACHI LTD
发明人： KANBE TETSUYA , ISHIKAWA AKIRA , TAMAI ICHIRO , YAHISA YOTSUO , HOSOE YUZURU , TANAHASHI KIWAMU , MATSUDA YOSHIBUMI , KATAOKA HIROYUKI , ONO TOSHINORI , FUKAYA SHINJI , URA KAZUHIRO , ENDO NAOTO , YAMAMOTO TOMOO
IPC分类号： G11B5/00 , G11B5/012 , G11B5/39 , G11B5/66 , G11B5/73 , G11B5/64
CPC分类号： B82Y25/00 , B82Y10/00 , G11B5/00 , G11B5/012 , G11B5/66 , G11B5/7325 , G11B2005/0016 , G11B2005/3996
摘要： A magnetic recording system includes an in-plane magnetic recording medium (4) having a magnetic layer (23) fabricated on a single underlayer or on a plurality of underlayers (21 - 22) respectively fabricated on a substrate (20); a driver unit for driving the in-plane magnetic recording medium in a write direction; a magnetic head (1) having a read unit and a write unit; a unit (2) for moving the magnetic head relative to the in-plane magnetic recording medium; and a read/write signal processing unit for reading an output signal from the magnetic head and writing an input signal to the magnetic recording media, wherein the read unit of the magnetic head is a magnetoresistive head and the single underlayer or at least one (21) of the plurality of underlayers is made of Co-containing amorphous material or fine crystal material, or is made of alloy material, the alloy material having as the main components at least one element selected from a group consisting of Cr, Mo, V and Ta and containing at least one element selected from a group consisting of B, C, P and Bi. The magnetic recording system can be realized which can read and write high density information and have high reliability.
摘要翻译：一种磁性记录系统包括具有磁性层（23）上的单个底层或上的下层（21 - 22）多个制造面内磁记录介质（4）的基板（20）上分别制造; 用于驱动在写入方向的面内磁记录媒体的驱动器单元; 磁头（1），具有一个读出单元和一个写入单元; 用于相对于所述面内磁记录媒体的磁头移动的单元（2）; 和用于读取关于输出信号从磁头与输入信号的写入到磁性记录介质，worin磁头的读出单元的读/写信号处理单元是磁阻磁头和单个基底层或至少一个（21 ）理解各层的多个由含Co的无定形材料或微细的晶体材料组成，或由合金材料制成的，从一组由Cr，Mo，V和的选择的至少一个元件，其具有作为主要成分的合金材料 Ta和含有选自由B中选出的至少一种元素，所述的磁性记录系统就能实现可以读取和写入的高密度信息并且具有高可靠性C，P和Bi ..

5. 发明专利

JP2004146029A Perpendicular magnetic recording medium, method of manufacturing the same, and magnetic storage using the same 有权
标题翻译：全息磁记录介质，其制造方法和使用该磁记录介质的磁存储
公开(公告)号：JP2004146029A
公开(公告)日：2004-05-20
申请号：JP2003006507
申请日：2003-01-15
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： HIRAYAMA YOSHIYUKI , NAKAGAWA HIROYUKI , NEMOTO HIROAKI , TAMAI ICHIRO , TAKEKUMA IKUKO
IPC分类号： G11B5/65 , B32B3/00 , G11B5/147 , G11B5/64 , G11B5/66 , G11B5/667 , G11B5/70 , G11B5/73 , G11B5/851
CPC分类号： B82Y10/00 , G11B5/656 , G11B5/66 , G11B5/7325 , G11B5/743 , Y10T428/24802
摘要： PROBLEM TO BE SOLVED: To provide a perpendicular magnetic recording medium which is small in medium noise, strong to thermal fluctuation, high in recording efficiency and high in recording resolution by making crystal grains of a recording layer magnetically isolated, finer and more uniform and making the film of an intermediate layer thinner. SOLUTION: The method of manufacturing the perpendicular magnetic recording medium provided with a perpendicular magnetization film through a backing soft magnetic layer on a nonmagnetic substrate has at least two steps; a step for forming a nonmetallic element-containing layer containing any among oxygen, nitrogen, silicon, and carbon and a step of forming metallic layers of isolated island-shaped structures between a step of forming the backing soft magnetic layer and a step for forming the perpendicular magnetization film. The average film thickness of the metallic layers of the isolated island-shaped structures is preferably specified to 0.1 nm, 2 nm. COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：为了提供一种垂直磁记录介质，其通过使记录层的晶粒磁隔离，更精细和更多地提供中等噪声，高热波动，高记录效率和高记录分辨率的垂直磁记录介质均匀并使中间层的薄膜变薄。解决方案：通过非磁性衬底上的背衬软磁层制造垂直磁记录介质的垂直磁记录介质的制造方法至少有两个步骤：用于形成含有氧，氮，硅和碳中的任何一种的含非金属元素的层的步骤和在形成背衬软磁性层的步骤和形成背衬软磁性层的步骤之间形成孤立的岛状结构的金属层的步骤垂直磁化膜。孤立的岛状结构体的金属层的平均膜厚优选规定为0.1nm，2nm。版权所有（C）2004，JPO

6. 发明专利

JP2000339659A MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE 失效
公开(公告)号：JP2000339659A
公开(公告)日：2000-12-08
申请号：JP15113699
申请日：1999-05-31
申请人： HITACHI LTD
发明人： YAMAMOTO TOMOO , TAMAI ICHIRO , ISHIKAWA AKIRA , SUZUKI HIROYUKI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/667 , G11B5/738
摘要： PROBLEM TO BE SOLVED: To provide a medium having excellent resistance against thermal fluctuation and having low noise by forming a Co alloy magnetic film directly on a substrate or with a specified base film interposed, and forming an orientation controlling film containing elements selected from each two groups in a specified range. SOLUTION: An orientation controlling film containing an element selected from Cr, Ge and Si by 50 to 80 at.% and an element selected from Al, Mo, Re and W by 20 to 45 at.% is formed on a substrate. Then a magnetic film consisting of a Co alloy is formed on the orientation controlling film. Preferably, the orientation controlling film substantially has a C11b crystal structure so as to orient the axis of easy magnetization of the magnetic film in the film plane. In order to orient a Cr base film to be formed thereon in the (211) direction by using the C11b orientation controlling film, the orientation controlling film is oriented in the (116) direction.

7. 发明专利

JPH11353820A MAGNETIC STORAGE DEVICE AND EVALUATION APPARATUS FOR MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH11353820A
公开(公告)日：1999-12-24
申请号：JP16180198
申请日：1998-06-10
申请人： HITACHI LTD
发明人： TAMAI ICHIRO , TANAHASHI KIWAMU , KANBE TETSUYA , MATSUNUMA SATORU , HOSOE YUZURU , ITO KIYONARI
IPC分类号： G11B20/10 , G11B19/02 , G11B20/12 , G11B20/18
摘要： PROBLEM TO BE SOLVED: To obtain a magnetic storage device in which an information bit started to degrade is restored automatically by preserving information which is recorded at the same time as a marker bit temporarily in a cache memory, recording again in a magnetic recording medium, and up dating the marker bit which is recorded in a header simultaneously. SOLUTION: A cache memory 31, an output detection circuit 32 and an automatic restoration control circuit 33 are provided at a control circuit system 35. The automatic restoration control circuit 33 is started by using an empty time in which an instruction from a host computer is not executed. When the degradation of information recorded inside a magnetic storage device is confirmed by using the output detection circuit 32, primary information is retreated to the cache memory 31, and it is recorded again. That is to say, a function which automatically copies the information inside the magnetic storage device is provided. At this time, it is suffient that the output detection circuit 32 can compares the output of a marker bit recorded in a header with the output of a reference bit recorded directly before.

8. 发明专利

JPH1173605A MAGNETIC STORAGE DEVICE 失效
公开(公告)号：JPH1173605A
公开(公告)日：1999-03-16
申请号：JP23361297
申请日：1997-08-29
申请人： HITACHI LTD
发明人： YAMAMOTO TOMOO , HOSOE YUZURU , TANAHASHI KIWAMU , KANBE TETSUYA , TAMAI ICHIRO
IPC分类号： G11B5/66 , G11B5/09 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To efficiently detect a signal from a recording bit by forming the recording bit in the transversal magnetic recording system so that a magnetizing direction of a magnetic record medium is nearly parallel to a medium surface and in the direction nearly orthogonal to a recording track direction and detecting leakage magnetic flux from the magnetic record medium with a reproducing head element using a magnetoresistance effect. SOLUTION: Since a magnetic pole occurs on the track edge part of the recording bit 0503, the leakage flux 0502 occurs in space. When a reproducing head consisting of an MR element 0501 being the reproducing head element using the magnetoresistance effect is traveled just on the recording bit 0503, the magnetoresistance of the MR element 0501 is changed according to the direction of the leakage flux 0503 from the recording bit 0501. At this point, when a fixed current J flows through the MR element 0501 always, the directional change of the leakage flux 0503 is detected as a voltage change. Thus, recording density per a square inch is corresponding with >=2 G bits.

9. 发明专利

JPH10269548A MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE USING IT 失效
公开(公告)号：JPH10269548A
公开(公告)日：1998-10-09
申请号：JP7717497
申请日：1997-03-28
申请人： HITACHI LTD
发明人： KANBE TETSUYA , TAKAHASHI YOSHIO , ISHIKAWA AKIRA , TAMAI ICHIRO , HOSOE YUZURU , MATSUDA YOSHIFUMI , TANAHASHI KIWAMU , YAMAMOTO TOMOO
IPC分类号： G11B5/66 , G11B5/39 , G11B5/64 , G11B5/65 , H01F10/16
摘要： PROBLEM TO BE SOLVED: To provide a highly reliable magnetic storage device capable of recording/reproducing high density information. SOLUTION: This device constitutes a reproducing part of a magnetic head with a magneto-resistive effect type magnetic head, and makes a magnetic recording medium a structure having a magnetic layer formed on a substrate through a single layer or a multilayer substrate layer. Then, the magnetic layer is constituted of a columnar structural magnetic crystal particle, or an amorphous magnetic particle, and the mean particle size of this magnetic particle, and particle size variance standardized by the mean particle size are made respectively 16 nm or below, 0.5 or below, and the value Ku.v/kT dividing the product between the magnetic anisotropic constant Ku and the volume v of this magnetic particle by the product between the Boltzmann constant k and the absolute temp. T is made 60 or above, and the magnetic layer film thickness is made double or below of the mean particle size. Thus, a noise is reduced, and a high S/N and a low bit error rate are obtained, and the magnetic storage device having a mean failure interval of 300 thousand times or above at high recording density of 2 G bits per 1 inch is realized.

10. 发明专利

JPH10222835A MAGNETIC RECORDING MEDIUM AND MAGNETIC MEMORY DEVICE 失效
公开(公告)号：JPH10222835A
公开(公告)日：1998-08-21
申请号：JP2347597
申请日：1997-02-06
申请人： HITACHI LTD
发明人： TAMAI ICHIRO , HOSOE YUZURU , YAMAMOTO TOMOO , MANGYO EMI , TANAHASHI KIWAMU , KANBE TETSUYA
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/738
摘要： PROBLEM TO BE SOLVED: To lower medium noise and to suppress the influence of a thermal fluctuation when magnetic crystal grains are made finer to a smaller level by specifying the Co content of the magnetic films of a magnetic recording medium formed by providing the surface of a substrate with the magnetic films contg. Co and Cr and simultaneously incorporating Pt and Ru into these magnetic films. SOLUTION: The Co concn. of the magnetic film of the magnetic recording medium formed by providing the surface of the substrate with the magnetic films contg. the Co and Cr is specified to 55 to 75 atom % and the Pt and Ru are simultaneously incorporated into the magnetic films. The Cr concn. of the magnetic films is specified to 15 to 25 atom % and the Pt concn. is specified to 5 to 24 atom %. The concn. of the total of the elements Pt and Ru is specified to 6 to 25 atom % and the balance is preferably composed of Co and inevitable impurities. As a result, the coercive force is enhanced, the medium noise is lowered and the influence of the thermal fluctuation is suppressed to the lower level. If the content of the Cr is below 15 atom %, the effect of lowering the noise is low and if the content is above 25 atom %, the magnetic films are made nonmagnetic.

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