专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 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

2. 发明专利

JP2004348777A 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：JP2004348777A
公开(公告)日：2004-12-09
申请号：JP2003141296
申请日：2003-05-20
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： TANAHASHI KIWAMU , ARAI REIKO , KIKUKAWA ATSUSHI
IPC分类号： G11B5/667 , G11B5/127 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/84
CPC分类号： G11B5/667 , G11B5/1278 , G11B5/66 , G11B5/84
摘要： PROBLEM TO BE SOLVED: To provide a vertical magnetic recording medium wherein quality of a reproducing signal is heightened by controlling magnetic domains of a soft magnetic base layer and demagnetization of recording magnetization due to a floating magnetic field is suppressed and which has a high medium S/N ratio at ≥7.75 gigabit/cm
2 recording density, and also to provide a high density magnetic recording device having high reliability.
SOLUTION: The soft magnetic base layer is constituted of a first amorphous soft magnetic layer to which an exchange bias magnetic field is imparted by an anti-ferromagnetic layer directly or via a ferromagnetic layer and a second amorphous soft magnetic layer formed thereon via a non-magnetic layer and the first and the second amorphous soft magnetic layers are anti-ferromagnetically bonded to each other.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：解决的问题：为了提供通过控制软磁性基层的磁畴来提高再现信号的质量并且由于浮动磁场而导致的记录磁化的退磁的垂直磁记录介质被抑制，并且其具有高介质S / N比在≥7.75吉比特/厘米2 /秒记录密度，并且还提供了具有高可靠性的高密度磁记录装置。解决方案：软磁性基层由第一非晶软磁层构成，交换偏置磁场由反铁磁层直接或通过铁磁层和形成在其上的第二非晶软磁层经由非磁性层和第一和第二非晶软磁性层彼此反铁磁结合。版权所有（C）2005，JPO＆NCIPI

3. 发明专利

JP2004227745A Magnetic recording medium, magnetic recorder with the same mounted thereon, and method and device for manufacturing magnetic recording medium 有权
公开(公告)号：JP2004227745A
公开(公告)日：2004-08-12
申请号：JP2003086318
申请日：2003-03-26
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： NAKAMURA ATSUSHI , SUZUKI YOSHIO , TANAHASHI KIWAMU , TSUCHIYA HIROKO
IPC分类号： G11B5/65 , G11B5/00 , G11B5/02 , G11B5/09 , G11B5/11 , G11B5/127 , G11B5/48 , G11B5/64 , G11B5/74 , G11B5/84 , G11B5/845
CPC分类号： G11B5/1278 , G11B5/012 , G11B5/02 , G11B5/09 , G11B5/11 , G11B5/488 , G11B5/4886 , G11B5/64 , G11B5/74 , G11B5/82 , G11B2005/0002 , G11B2005/0005 , G11B2005/0029 , Y10T428/11
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recorder in which the resolution and the S/N are improved without impairing the heat resistant demagnetization property as compared with a conventional technology. SOLUTION: An angle formed by the easy magnetization direction of a recording layer and the normal direction of the magnetic recording medium is set to 5-55°, and the easy magnetization direction is taken to the direction toward a front surface of the recording layer from the rear, and when the recording track direction is taken to the direction toward the downstream side from the upstream side of the moving direction of the magnetic recording medium, an angle formed by the direction of a projection of the easy magnetization direction on the surface of the magnetic recording medium and the above recording track direction is set to 0-70°. COPYRIGHT: (C)2004,JPO&NCIPI

4. 发明专利

JP2004047107A Method for manufacturing perpendicular magnetic recording medium 审中-公开
公开(公告)号：JP2004047107A
公开(公告)日：2004-02-12
申请号：JP2003344249
申请日：2003-10-02
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： TANAHASHI KIWAMU , KIKUKAWA ATSUSHI , SHIMIZU NOBORU , HONDA YUKIO , HOSOE YUZURU
IPC分类号： G11B5/667 , G11B5/738 , G11B5/84 , G11B5/851 , G11B5/852
摘要： PROBLEM TO BE SOLVED: To provide a two-layer perpendicular magnetic recording medium having a high medium S/N at a recording density of 50 gigabits or more per square inch, and to provide a magnetic storage device which has a low error rate and excellent reliability.
SOLUTION: In this perpendicular magnetic recording medium configured by sequentially stacking a magnetic domain control layer 12, an amorphous soft magnetic underlayer 13, an intermediate layer 14 and a perpendicular recording layer 15 on a substrate 11, the magnetic domain control layer 12 is composed of a three-layer film wherein a first polycrystalline soft magnetic layer, a random antiferromagnetic layer and a second polycrystalline soft layer are stacked.
COPYRIGHT: (C)2004,JPO

5. 发明专利

JP2004342313A Method and apparatus for inspecting perpendicular magnetic recording medium 审中-公开
公开(公告)号：JP2004342313A
公开(公告)日：2004-12-02
申请号：JP2004215936
申请日：2004-07-23
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： KIKUKAWA ATSUSHI , TANAHASHI KIWAMU , HONDA YUKIO , FUTAMOTO MASAAKI , HIRAYAMA YOSHIYUKI
IPC分类号： G11B5/84
摘要： PROBLEM TO BE SOLVED: To form a distribution chart and to decide whether it is good or bad by automatically detecting the position of spike noises. SOLUTION: The cross-correlation function of a signal waveform from a magnetic head 1 and a reference wavelength for simulating spike noise is used for spike noise extraction. The number at which the peak of the cross-correlation function exceeds the threshold is counted and the spike noise is quantitatively evaluated. COPYRIGHT: (C)2005,JPO&NCIPI

6. 发明专利

JP2004146015A Magnetic recording medium and method for manufacturing the same 有权
公开(公告)号：JP2004146015A
公开(公告)日：2004-05-20
申请号：JP2002312028
申请日：2002-10-28
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： HONDA YOSHINORI , TANAHASHI KIWAMU , HOSOE YUZURU , YAHISA YOTSUO , KATAOKA HIROYUKI
IPC分类号： G11B5/667 , G11B5/851
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a vertical recording medium having excellent surface characteristics equal to or better than those of an intra-plane magnetic recording medium by preventing surface roughness from increasing in performing deposition of the magnetic recording medium of a vertical system by magnetron sputtering.
SOLUTION: The vertical magnetic recording medium is deposited with a soft magnetic layer 5 constituting the vertical magnetic recording medium at a film thickness of the soft magnetic layer 5 within a range from 50 to 500 nm by dividing a nonmagnetic substrate under temperature conditions from 20 to 200°C. The surface roughness of the medium can be reduced and a surfacing yield of ≥95% can be assured. In addition, a deposition tact can be made shorter without lowering a deposition rate and therefore the assurance of a great deal of productivity is made possible. Particularly the means is most effective for deposition of thick films like the soft magnetic layers of the vertical media.
COPYRIGHT: (C)2004,JPO

7. 发明专利

JP2004039152A Perpendicular magnetic recording medium, its manufacturing method, and magnetic storage 有权
公开(公告)号：JP2004039152A
公开(公告)日：2004-02-05
申请号：JP2002196664
申请日：2002-07-05
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： TANAHASHI KIWAMU , KIKUKAWA ATSUSHI , TAKAHASHI YOSHIO , HOSOE YUZURU
IPC分类号： G11B5/66 , G11B5/667 , G11B5/673 , G11B5/73 , G11B5/738 , G11B5/84 , H01F10/32 , H01F41/14
CPC分类号： G11B5/667 , G11B5/66
摘要： PROBLEM TO BE SOLVED: To provide a perpendicular magnetic recording medium having a high medium S/N at recording density of 50 giga bits or more per one square inch. SOLUTION: A perpendicular recording layer is formed through a soft magnetic substrate layer on a substrate includes a plurality of soft magnetic layers physically separated from the soft magnetic substrate layer by non-magnetic layers, and composes the soft magnetic layer of nano-crystals. Furthermore, a local magnetized closed loop is formed on an interlayer of the adjacent soft magnetic layer through the non-magnetic layer, so that spike noise and modulation caused by the soft magnetic substrate layer are suppressed. COPYRIGHT: (C)2004,JPO

8. 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.

9. 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.

10. 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.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式