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

JPH10255251A MAGNETIC STORAGE MEDIUM 失效
公开(公告)号：JPH10255251A
公开(公告)日：1998-09-25
申请号：JP5879697
申请日：1997-03-13
申请人： HITACHI LTD , HITACHI MAXELL
发明人： TAKAHASHI TERUO , TAKAYAMA TAKANOBU , MATSUYAMA HIDEO , HIRAYAMA YOSHIYUKI
IPC分类号： G11B5/66 , G11B5/02 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/84
摘要： PROBLEM TO BE SOLVED: To selectively control the decrease in noise and the increase in an output signal by inclining the incidence direction of a magnetic particle from the vertical direction of a substrate surface and setting the reverse magnetic domain size in a medium to a specific value or less for a desired track direction when forming a recording magnetic film used for a magnetization constituent being perpendicular to a recording surface. SOLUTION: When a recording magnetic film is formed on a substrate, the incidence direction of a magnetic particle is inclined from the normal direction of a substrate surface to, for example, a direction that is parallel to a track, thus inclining the growth direction of a crystal particle and inclining the axis of easy magnetization in a direction that is parallel to the track, thus reducing the size of a reverse magnetic domain 5 to 40nm or less for a direction that is perpendicular to the recording surface and decreasing a medium noise. On the other hand, the size in the direction that is parallel to the track is extended, so that the fluctuation of a bit boundary part 6 increases and an output signal decreases. Therefore, a method for inclining in the direction that is parallel to the track is suited for a head for increased output signal such as an MR head. In the case of an inductive head, the incidence direction is inclined in a direction being vertical to the track.

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

JPH08249601A MAGNETIC RECORDING/REPRODUCING DEVICE 失效
公开(公告)号：JPH08249601A
公开(公告)日：1996-09-27
申请号：JP4524895
申请日：1995-03-06
申请人： HITACHI LTD , HITACHI MAXELL
发明人： TAKAYAMA TAKANOBU , YOSHIDA KAZUYOSHI , SUZUKI MIKIO , MARUYAMA YOJI , HIRAYAMA YOSHIYUKI , FUTAMOTO MASAAKI , HONDA YUKIO
IPC分类号： G11B5/66 , G11B5/02 , G11B5/127 , G11B5/64
摘要： PURPOSE: To obtain a magnetic recording device with an improved reproduction output/medium noise ratio. CONSTITUTION: A ring-type magnetic head is used for a magnetic recording medium with vertical magnetic anisotropy or oblique direction magnetic anisotropy to record information magnetically. A magnetic recording medium is a thin-film magnetic recording medium 1 and the density of the constituent in vertical direction of a magnetic flux generated from a magnetic pole at the front edge side of a ring-type magnetic head 2 is larger than that of a constituent in vertical direction of a magnetic flux generated from a rear-edge- side magnetic pole, thus obtaining a high reproduction output/medium noise ratio with a high line recording density of 150kFCI or larger.

4. 发明专利

JP2013235621A Microwave-assisted recording magnetic head and magnetic recording device 审中-公开
标题翻译：微波辅助记录磁头和磁记录装置
公开(公告)号：JP2013235621A
公开(公告)日：2013-11-21
申请号：JP2012105625
申请日：2012-05-07
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： IGARASHI KAZUSUKATSU , WATANABE KATSURO , HIRAYAMA YOSHIYUKI , SHIMIZU JUNICHIRO
IPC分类号： G11B5/31 , G11B5/02
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording device capable of achieving recording density exceeding 2 terabits per square inch in microwave-assisted recording.SOLUTION: The width of a main magnetic pole 5 and the width of a high-frequency magnetic field generation layer 2 are set to the substantially same for compensating shortage in high-frequency magnetic field intensity and deterioration in high-frequency magnetic field intensity gradient due to narrowing of the width of the high-frequency magnetic field generation layer. Further, a position where a change in a high-frequency magnetic field component that is effective in magnetization inversion is maximized and a position of the reversed magnetic field intensity of a recording medium in the high-frequency magnetic field (intensity and frequency) for use in a head magnetic field are made to match each other.
摘要翻译：要解决的问题：提供一种能够在微波辅助记录中实现超过2兆比特/平方英寸的记录密度的磁记录装置。解决方案：主磁极5的宽度和高频磁场产生层的宽度由于高频磁场产生层的宽度变窄，高频磁场强度梯度的高频磁场强度的劣化和高频磁场强度梯度的劣化被设定为基本相同。此外，在磁化反转中有效的高频磁场分量的变化最大化的位置和记录介质在高频磁场（强度和频率）中的反向磁场强度的位置被使用在磁头磁场中相互匹配。

5. 发明专利

JP2012146362A Perpendicular magnetic recording medium, manufacturing method therefor, and magnetic recording/reproducing method 审中-公开
标题翻译：全能磁记录介质，其制造方法和磁记录/再现方法
公开(公告)号：JP2012146362A
公开(公告)日：2012-08-02
申请号：JP2011003974
申请日：2011-01-12
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： SHIMIZU MASAYOSHI , IWASE HIROSHI , HIRAYAMA YOSHIYUKI
IPC分类号： G11B5/65 , C23C14/04 , C23C14/14 , C23C14/48 , G11B5/09 , G11B5/667 , G11B5/84 , G11B5/851 , G11B5/855 , H01F41/34
摘要： PROBLEM TO BE SOLVED: To use a magnetic head having a recording element and a reproducing element which are excellent in thermal stability and a recording property and are wider than a track period of a bit pattern, even when the bit pattern is densely integrated.SOLUTION: A truncated cone-shaped recording bit includes a thermally stable layer having large perpendicular magnetic anisotropy at a lower layer, and a high output layer having large saturation magnetic flux density at an upper layer. An outer peripheral part is a thermally stable area 22 of which the high output layer is removed and thermal stability is improved, and a center part is a reproduction area 21. Also, an inversion control area 23 of which perpendicular magnetic anisotropy and saturation magnetic flux density are made small is provided between the outer peripheral part and the center part.
摘要翻译：要解决的问题：为了使用具有热稳定性和记录特性优异并且比比特图案的轨道周期更宽的记录元件和再现元件的磁头，即使位图密集集成。解决方案：截头圆锥形记录位包括在下层具有大的垂直磁各向异性的热稳定层和在上层具有大的饱和磁通密度的高输出层。外周部是除去高输出层并提高热稳定性的热稳定区域22，中心部分是再现区域21.另外，具有垂直磁各向异性和饱和磁通量的反转控制区域23 在外周部分和中心部分之间设置较小的密度。版权所有（C）2012，JPO＆INPIT

6. 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

7. 发明专利

JP2001023141A PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC MEMORY DEVICE 失效
公开(公告)号：JP2001023141A
公开(公告)日：2001-01-26
申请号：JP19172099
申请日：1999-07-06
申请人： HITACHI LTD
发明人： FUTAMOTO MASAAKI , HIRAYAMA YOSHIYUKI , HONDA YUKIO , KIKUKAWA ATSUSHI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/738
摘要： PROBLEM TO BE SOLVED: To make a recording medium have a low-noise characteristic for high-density recording by separating a perpendicular magnetization film set via a nonmagnetic undercoat layer or backing magnetic film layer onto a nonmagnetic substrate to a plurality of layers by at least one Al film or Al alloy film. SOLUTION: At least one Al film or Al alloy film is introduced in the middle of a perpendicular magnetization film to accelerate to make magnetic crystal particles fine and magnetically separated. The structure is effective both to a single layer perpendicular magnetic recording medium having a perpendicular magnetization film and a protecting film formed on a nonmagnetic substrate via a nonmagnetic undercoat layer, and to a double layer perpendicular magnetic recording medium having a perpendicular magnetization film and a protecting film formed on a nonmagnetic substrate via a backing magnetic film layer. Moreover, the effect is further increased when an Al alloy added with an element such as B, C, Cr, Cu, Ge, Hf, Ir, Mg, Mn, Si or the like to is used.

8. 发明专利

JP2001023140A PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC MEMORY APPARATUS 失效
公开(公告)号：JP2001023140A
公开(公告)日：2001-01-26
申请号：JP19155199
申请日：1999-07-06
申请人： HITACHI LTD
发明人： FUTAMOTO MASAAKI , HIRAYAMA YOSHIYUKI , HONDA YUKIO , KIKUKAWA ATSUSHI
IPC分类号： G11B5/66 , G11B5/00 , G11B5/012 , G11B5/39 , G11B5/64 , G11B5/65 , G11B5/667 , G11B5/73 , G11B5/738
摘要： PROBLEM TO BE SOLVED: To obtain a perpendicular magnetic recording medium improved to fit a high-density magnetic recording. SOLUTION: In the perpendicular magnetic recording medium having a perpendicular magnetization film 15 and a protecting film 16 set via a backing magnetic film 13 on a nonmagnetic substrate 11, a polycrystal MgO film 14 having a (100) plane nearly parallel to the substrate is inserted between the backing magnetic film 13 and the perpendicular magnetization film 15. Since the resolution of the perpendicular magnetic recording medium is improved, noises can be reduced, and a high S/N ratio can be obtained, a magnetic disk apparatus can be made a high density apparatus, particularly able to execute high-density magnetic recording of not smaller than 30 Gb/in2, and the apparatus can be readily made compact with a large capacity.

9. 发明专利

JP2000251237A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JP2000251237A
公开(公告)日：2000-09-14
申请号：JP4588499
申请日：1999-02-24
申请人： HITACHI LTD
发明人： FUTAMOTO MASAAKI , INABA NOBUYUKI , HIRAYAMA YOSHIYUKI , TAKEUCHI TERUAKI , HONDA YUKIO
IPC分类号： G11B5/66 , G11B5/64 , G11B5/738
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording medium capable of a high density recording at 10 Gb/in2 or more enough to be actually available by improving the heat resistance fluctuation characteristic. SOLUTION: A base film adjacent a Co alloy magnetic film is made from a Co-Crx-My alloy film having an hcp structure, the additive concn. of Cr + nonmagnetic element M is 25 at.%

10. 发明专利

JP2000163734A MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING REPRODUCING DEVICE 失效
公开(公告)号：JP2000163734A
公开(公告)日：2000-06-16
申请号：JP33877798
申请日：1998-11-30
申请人： HITACHI LTD
发明人： HONDA YUKIO , HIRAYAMA YOSHIYUKI , INABA NOBUYUKI , FUTAMOTO MASAAKI , TAKEUCHI TERUAKI , KANBE TETSUYA , YAMAMOTO TOMOO
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/738 , G11B5/85 , G11B5/851 , H01F10/16 , H01F10/30
摘要： PROBLEM TO BE SOLVED: To obtain a medium having small reproducing noise and excellent stability of recording magnetization by forming a Co-based alloy thin film of magnetic crystal grains having a compsn. segregation structure and specifying each of the average Co density in the inner part of the magnetic crystal grains and the average Co density in the intergranular part. SOLUTION: A Co-based alloy thin film having a hexagonal close-packed structure essentially comprising Co is used as a magnetic thin film formed on a substrate. The magnetic thin film consists of magnetic crystal grains of =75 at.%, while the average Co density on the intergranular part is =75 at.% and the intergranular part of the magnetic crystal grains consists of a nonmagnetic or weak magnetic layer having

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