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1. 发明专利

JPH0981928A MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDER USING THE SAME 失效
公开(公告)号：JPH0981928A
公开(公告)日：1997-03-28
申请号：JP23813795
申请日：1995-09-18
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KAEDE HIROSHI , ADACHI KAZUNORI , FUTAMOTO MASAAKI , AKAGI KYO , TANAHASHI KIWAMU
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/738 , G11B5/82
摘要： PROBLEM TO BE SOLVED: To ensure low noise and to enable a high-speed recording even when a plastic having a low softening point is used as a substrate by imparting a prescribed surface roughness to a magnetic film. SOLUTION: A substrate 1 is made of surface-tempered glass, a Cr film as an under film 2, a CoCrPt film as a magnetic film 3 and a carbon film as a protective film 4 are successively formed under the same condition in film formation and then a lubricant film 11 is formed by vacuum deposition. The magnetic film 3 contains at least grains having (100) faces parallel to the film surface and a hexagonal closest-packed structure and grains having (101) faces parallel to the film surface and a hexagonal closest-packed structure. The ratio between the peak intensity of the X-ray diffraction of the grains having (100) faces parallel to the film surface and that of the grains having (101) faces parallel to the film surface is 1:0.5 to 1:5.

2. 发明专利

JPH09212855A MAGNETIC RECORDING MEDIUM, MAGNETIC HEAD, AND MAGNETIC RECORDING AND REPRODUCING DEVICE USING THEM 失效
公开(公告)号：JPH09212855A
公开(公告)日：1997-08-15
申请号：JP1862096
申请日：1996-02-05
申请人： HITACHI LTD , HITACHI MAXELL
发明人： TAKAYAMA TAKANOBU , TANAHASHI KIWAMU , YOSHIDA KAZUYOSHI , SUZUKI MIKIO , HIRAYAMA YOSHIYUKI , FUTAMOTO MASAAKI , MARUYAMA YOJI
IPC分类号： G11B5/82 , G11B5/09 , G11B5/56 , G11B5/62 , G11B5/64 , G11B5/65 , G11B5/667 , G11B5/85
摘要： PROBLEM TO BE SOLVED: To improve the reproducing output/medium noise ratio and the line recording density by forming a magnetic layer so that the axis when easy magnetization axis is projected on the surface of the magnetic recording medium is tilted in one direction from the direction of tracks for information recording. SOLUTION: Volume particles 402 are sputtered from a circular target 400 to a disk substrate 111. In this process, an circular aperture 300 is formed between the sputtering target 400 and the substrate 111 so as to deposit particles sputtering in the radial direction of the substrate 111 from the area 401 which generates sputtering particles with high density and is concentrically formed on the surface of the target 400. Ti to be the base layer of the magnetic layer is formed in 50nm thickness by this method, and then a Co-Cr-Ta alloy is formed in 100nm thickness as the magnetic layer. By this method, the surface recording density is several times as much as a conventional intrasurface recording method can be obtd.

3. 发明专利

JPH08293112A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH08293112A
公开(公告)日：1996-11-05
申请号：JP9825595
申请日：1995-04-24
申请人： HITACHI LTD , HITACHI MAXELL
发明人： TANAHASHI KIWAMU , TAKAYAMA TAKANOBU , FUTAMOTO MASAAKI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/738
摘要： PURPOSE: To reduce the size of magnetization inversion and to attain a high C-N ratio at the time of high density recording by weakening magnetic coupling in the transverse direction of a substrate. CONSTITUTION: A nonmagnetic underlayer 22 or a magnetic underlayer 22 having

4. 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.

5. 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.

6. 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.

7. 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 ..

8. 发明专利

JP2004348849A Vertical magnetic recording medium and magnetic recording device 审中-公开
标题翻译：垂直磁记录介质和磁记录装置
公开(公告)号：JP2004348849A
公开(公告)日：2004-12-09
申请号：JP2003144260
申请日：2003-05-22
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： ARAI REIKO , TANAHASHI KIWAMU , KIKUKAWA ATSUSHI
IPC分类号： G11B5/667 , G11B5/00 , G11B5/65 , G11B5/73
CPC分类号： G11B5/732 , G11B5/667 , G11B2005/0029
摘要： PROBLEM TO BE SOLVED: To provide a high density memory recording device which has a recording density of ≥7.75 gigabit per square centimeter and prevents the occurrence of a fluctuation in reproduction output, demagnetization of magnetization and degaussing of a recording layer.
SOLUTION: A soft magnetic underlayer and a vertical recording layer are successively stacked on a magnetic disk substrate. The soft magnetic underlayer is formed of a three-layered structure which consists of a magnetic domain control layer including an antiferromagnetic layer interposed between first and second soft magnetic layers. When the film thicknesses of the first and second soft magnetic layers are respectively defined as d1 and d2, both of d1 and d2 are ≥25 nm and ≤150 nm and d1/d2 is ≥0.3 to ≤1.5. Thereby, the magnetic domains of the soft magnetic underlayer of the vertical magnetic recording medium can be controlled and the domain wall displacement can be suppressed.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种具有≥7.75吉比特/平方厘米的记录密度的高密度记录记录装置，并且防止再现输出的波动的发生，记录层的磁化和消磁的消磁。解决方案：软磁性底层和垂直记录层依次层叠在磁盘基板上。软磁性底层由三层结构构成，其由包括介于第一和第二软磁层之间的反铁磁层的磁畴控制层组成。当第一和第二软磁层的膜厚分别定义为d1和d2时，d1和d2分别为≥25nm和≤150nm，d1 / d2分别为≥0.3至≤1.5。因此，可以控制垂直磁记录介质的软磁性底层的磁畴，并且可以抑制畴壁位移。版权所有（C）2005，JPO＆NCIPI

9. 发明专利

JP2003162806A PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE 审中-公开
公开(公告)号：JP2003162806A
公开(公告)日：2003-06-06
申请号：JP2001360242
申请日：2001-11-27
申请人： HITACHI LTD
发明人： TANAHASHI KIWAMU , KIKUKAWA ATSUSHI , SHIMIZU NOBORU , HONDA YUKIO , HOSOE YUZURU
IPC分类号： G11B5/65 , G11B5/66 , G11B5/667 , G11B5/851 , G11B5/852
摘要： PROBLEM TO BE SOLVED: To prevent the spike noise caused by a soft magnetic base layer of a perpendicular magnetic recording medium, and to provide a magnetic storage device excellent in the reliability at the recording density of ≥50 Gbit/in 2 , in which the error rate is low. SOLUTION: A magnetic domain control layer on a substrate, a soft magnetic base layer, and a perpendicular recording layer are stacked in series, in which the magnetic domain control layer is a three layered film composed of a nonmagnetic layer of an fcc structure, an antiferromagnetic layer, and a crystalline ferromagnetic layer. The formation of a magnetic domain wall in the soft magnetic base layer is prevented by performing a heat treatment in a magnetic field. Thus, the magnetic storage device excellent in the reliability at the recording density of ≥50 Gbit/in 2 and having the low error rate can be realized. COPYRIGHT: (C)2003,JPO

10. 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.

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