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11. 发明专利

JP2000149201A MAGNETIC MEMORY REPRODUCING DEVICE 失效
公开(公告)号：JP2000149201A
公开(公告)日：2000-05-30
申请号：JP31723198
申请日：1998-11-09
申请人： HITACHI LTD
发明人： AKAGI FUMIKO , IGARASHI KAZUSUKATSU , YOSHIDA KAZUYOSHI , ISHIKAWA AKIRA
IPC分类号： G11B5/66 , G11B5/00 , G11B5/012 , G11B5/02 , G11B5/455 , G11B5/64 , G11B5/65
摘要： PROBLEM TO BE SOLVED: To obtain good characteristics of S/N ratio, resolution and thermal fluctuation by using a magnetic recording medium having a three-dimensionally oriented axis of easy magnetization of magnetic particles in the magnetic layer and making the magnetic recording medium have a recording magnetization pattern with a specified or smaller magnetization inversion distance of the medium. SOLUTION: This magnetic head is a recording and reproducing separation type head consisting of the combination of an electromagnetic induction magnetic head for recording and a magnetoresistance effect head for reproducing formed on a magnetic head slider body substrate, and it has a recording magnetization pattern with

12. 发明专利

JPH11186033A FERROMAGNETIC METALLIC COMPOUND FILM, ITS MANUFACTURE, AND MAGNETIC RECORD MEDIUM 失效
公开(公告)号：JPH11186033A
公开(公告)日：1999-07-09
申请号：JP34756297
申请日：1997-12-17
申请人： HITACHI LTD
发明人： TAKAHASHI HIROMASA , IGARASHI KAZUSUKATSU
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , H01F10/14
摘要： PROBLEM TO BE SOLVED: To provide a ferromagnetic metallic compound film which can be used for high-density recording, by fixing saturated magnetic flux density of the film within a specific range, and making vertical anisotropy energy of the compound film controllable to an arbitrary value in a specific range by controlling the size and thickness of the area where the atoms invaded into the compound film are regularly arranged. SOLUTION: A ferromagnetic metallic compound film is formed on a single-crystal substrate and composed of a body-centered tetragonal crystal, which is formed on a single-crystal substrate and in which nonmagnetic atoms of N or C are made to infiltrate into at least one kind of ferromagnetic metallic atoms selected from among Fe, Co, and Ni and a magnetic recording medium is constituted in a mutilayered film containing at least one ferromagnetic metallic compound film thus formed. For an Fe16 N2 single-crystal film formed on a single-crystal substrate, the vertical anisotropy energy is adjusted to an arbitrary value between 6×10 erg/cc and 25×10 erg/cc when the saturation magnetization of the film is 29.2±0.7 kG. For an Fe-N martensite film, the vertical anisotropy energy varies between 1×10 erg/cc and 5×10 erg/cc, when the saturated magnetic flux density is 24.2±0.5 kG at a room temperature.

13. 发明专利

JPH10334446A MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING DEVICE USING THE SAME 失效
公开(公告)号：JPH10334446A
公开(公告)日：1998-12-18
申请号：JP14491197
申请日：1997-06-03
申请人： HITACHI LTD
发明人： YAMANAKA ICHISUKE , YAMAMOTO TOMOO , INABA NOBUYUKI , IGARASHI KAZUSUKATSU , KAMISAKA YASUTARO
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/738 , H01F10/16
摘要： PROBLEM TO BE SOLVED: To reduce noise at the reproducing time and to suppress its temp. change and then to endure a using temp. in a specific temp. range and also to attain recording density of more than a prescribed value by using a ferromagnetic metal this film of the product of a volume change of activation at the remanence coercive force point and spontaneous magnetization and its temp. change rate falling within specific ranges respectively as a magnetic layer. SOLUTION: A fluctuation field Hf is obtained from the dependency of a magnetic field impressing time (t) of coercive force Hc or remanence coercive force Hr by an equation I, and the product vIsb of the volume change of activation (v) and the spontaneous magnetization Isb is obtained by an equation II. Then, a difference Δ(vIsb) between the products (vIsb) at 80 deg.C and 25 deg.C respectively is divided by a temp. difference ΔT, and is moreover divided by the product (vIsb) at 25 deg.C to obtain a value as the temp. changing rate of the product vIsb. Then, the ferromagnetic metal thin film of vIsb=0.7 to 1.3×10 emu with the temp. changing rate ΔvIsb/ΔT/ vIsb is used for the magnetic layer to suppress any increase of noise of the medium due to a temp. rise, thus obtaining the high density magnetic recording device to the operated at the using temp. of 0 deg.C to 80 deg.C.

14. 发明专利

JPH10241937A MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDER USING IT 失效
公开(公告)号：JPH10241937A
公开(公告)日：1998-09-11
申请号：JP4036997
申请日：1997-02-25
申请人： HITACHI LTD
发明人： IGARASHI KAZUSUKATSU , YAMAMOTO TOMOO , YOSHIDA KAZUYOSHI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/667 , G11B5/738 , H01F10/16
摘要： PROBLEM TO BE SOLVED: To obtain a magnetic recording medium having a high coercive force and a high squareness ratio by improving the in-plane orientational property by using a Cr alloy film formed on a highly oriented Cr film as the substrate of a successively epitaxially grown magnetic film. SOLUTION: After a bcc (100)-oriented Cr film 5 is formed on a nonmagnetic substrate 11, a Cr alloy film 6 is formed on the Cr film 5 and the in-plane orientation property of the film 6 is improved. At the time of forming the films 5 and 6, the thickness of the film 5 is adjusted to about 5-80nm and the optimum thickness of the film 6 is decided to about 1-20nm from the relation among the magnitudes of the lattice constants of the films 5 and 6 and a magnetic film 13. The lattice constant of the film 6 is adjusted to 2.95Å by adding at least one kind of element selected from among Ti, Si, Mo, V, W, Ta, Zr, Mn, Au, Ag, Pd, Cu, Ir, Re, and Ga to Cr which is the main component of the film 6. Therefore, medium noise can be reduced by suppressing disturbances at bit boundaries.

15. 发明专利

JPH08138228A MAGNETIC RECORDING MEDIUM, ITS PRODUCTION AND MAGNETIC RECORDER 失效
公开(公告)号：JPH08138228A
公开(公告)日：1996-05-31
申请号：JP27777594
申请日：1994-11-11
申请人： HITACHI LTD
发明人： ISHIKAWA AKIRA , INABA NOBUYUKI , IGARASHI KAZUSUKATSU , YAMAMOTO TOMOO , FUTAMOTO MASAAKI
IPC分类号： C23C14/14 , C23C14/34 , G11B5/02 , G11B5/39 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/738 , G11B5/85 , H01F10/16
摘要： PURPOSE: To produce a magnetic recording medium capable of low levitation of a head and capable of high density recording and to obtain a magnetic recorder. CONSTITUTION: In a magnetic recording medium with a nonmagnetic discoid substrate 11 and a magnetic film 14 formed on the substrate 11, the concns. of Cr, Ta and Sm in the magnetic film 14 are regulated to 10-20at.%, 2-6at.% and 1-20at.%, respectively. The product Br.δ of the residual magnetization Br of the magnetic film measured in the head running direction and the total film thickness 3d is regulated to 5-100Gμm and the coercive force is regulated to 2.5-5kOe.

16. 发明专利

JP2014049147A Magnetic storage device and method for manufacturing the same 审中-公开
标题翻译：磁性存储装置及其制造方法
公开(公告)号：JP2014049147A
公开(公告)日：2014-03-17
申请号：JP2012189355
申请日：2012-08-30
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： SHIROISHI YOSHIHIRO , WATANABE KATSURO , IGARASHI KAZUSUKATSU
IPC分类号： G11B5/02 , G11B5/09 , G11B5/31
摘要： PROBLEM TO BE SOLVED: To provide a control method and device for making a large capacity magnetic storage device having a microwave-assisted magnetic recording head mounted and having a high remote track interference tolerance have a high yield with a magnetic head, and a magnetic storage device.SOLUTION: A recording magnetic field is generated from a recording magnetic pole by a bias recording current in which remote track interference does not substantially occur when a microwave assist part is put in a non-operation state, and information is recorded in a perpendicular magnetic recording medium by using both the recording magnetic field and a microwave assist effect.
摘要翻译：要解决的问题：提供一种用于制造具有安装有微波辅助磁记录头并具有高远程轨道干扰公差的大容量磁存储装置的控制方法和装置，具有高磁头的高产量，以及磁存储装置。解决方案：通过偏移记录电流从记录磁极产生记录磁场，当微波辅助部件处于非操作状态时，基本上不发生远程磁道干扰，并且信息被记录在垂直方向磁记录介质，通过使用记录磁场和微波辅助效果。

17. 发明专利

JP2014006959A Information recording device 有权
标题翻译：信息记录装置
公开(公告)号：JP2014006959A
公开(公告)日：2014-01-16
申请号：JP2013214736
申请日：2013-10-15
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： IGARASHI KAZUSUKATSU , MIYAMOTO JIICHI
IPC分类号： G11B5/31 , G11B5/02 , G11B5/65
CPC分类号： H01L43/08 , G11B5/314 , G11B2005/001 , G11B2005/0024 , H01L27/22
摘要： PROBLEM TO BE SOLVED: To provide an information recording device which has high reliability by accelerating excellent flux reversal of a magnetic recording medium in microwave assist recording.SOLUTION: A retraction part from an ABS surface is provided at a track width-directional end of a bottom surface of an FGL laminate film for high-frequency magnetic field generation. Alternatively, the FGL laminate film is sectioned in an inverted trapezoid shape (along a plane perpendicular to a direction in which a current flow) or increases in sectional area away from a main magnetic pole side. An excellent recording pattern is formed on a recording medium, so while the recording density of an information recording device can be increased, the reliability is improved, thereby lowering the cost eventually.
摘要翻译：要解决的问题：提供一种信息记录装置，其通过加速微波辅助记录中的磁记录介质的良好的磁通反转而具有高的可靠性。解决方案：来自ABS表面的退回部分设置在用于高频磁场产生的FGL层压膜的底面。或者，FGL层叠膜以倒梯形（沿着与电流流动的方向垂直的平面）分割，或者与主磁极侧的截面积增加。在记录介质上形成良好的记录图形，因此，可以提高信息记录装置的记录密度，提高可靠性，从而最终降低成本。

18. 发明专利

JP2011086342A Method and device for initializing magnetic recording medium 有权
标题翻译：用于初始化磁记录介质的方法和装置
公开(公告)号：JP2011086342A
公开(公告)日：2011-04-28
申请号：JP2009238343
申请日：2009-10-15
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： IGARASHI KAZUSUKATSU
IPC分类号： G11B5/024 , G11B5/02 , G11B5/31 , G11B5/325 , H01L29/82 , H01L43/08
摘要： PROBLEM TO BE SOLVED: To provide a recording medium initializing device supporting assisted magnetic recording which employs a method of quickly initializing a recording medium having a large magnetic anisotropy, which supports energy-assisted magnetic recording and has a recording density of more than 1T bits per inch square, at a low cost with a small load on the recording medium. SOLUTION: A degaussing unit 307 consisting of: a pair of magnets 301; and a microwave strip line 302 is configured. The magnets 301 have opposite magnetization directions of each other and form a static magnetic field in parallel to the longitudinal direction of the microwave strip line 302 over the microwave strip line 302. A high-frequency voltage is applied to an end portion of an electrode 303, so that a high-frequency current flows through the microwave strip line 302 to form a high-frequency magnetic field in a direction perpendicular to the longitudinal direction of the microwave strip line 302 in the vicinity of the microwave strip line 302. COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：提供一种支持辅助磁记录的记录介质初始化装置，其采用快速初始化具有大的磁各向异性的记录介质的方法，其支持能量辅助磁记录并且具有大于 1T位/平方英寸，成本低，记录介质上的负载小。解决方案：消磁单元307，包括：一对磁体301; 配置微波带线302。磁体301彼此具有相反的磁化方向，并且通过微波带线302与微波带线302的纵向方向平行地形成静态磁场。高频电压被施加到电极303的端部，使得高频电流流过微波带线302，以在与微波带线302附近的微波带线302的纵向垂直的方向上形成高频磁场。版权所有（C）2011，JPO＆INPIT

19. 发明专利

JP2010257539A Magnetic recording head and magnetic recording device 有权
标题翻译：磁记录头和磁记录装置
公开(公告)号：JP2010257539A
公开(公告)日：2010-11-11
申请号：JP2009107830
申请日：2009-04-27
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： IGARASHI KAZUSUKATSU
IPC分类号： G11B5/31
摘要： PROBLEM TO BE SOLVED: To provide a high-density information recording device having high reliability by stabilizing operation of a magnetization high-speed rotation body that generates high-frequency magnetic field, in microwave assist recording. SOLUTION: A magnetization high-speed rotation body 2 is arranged at the vicinity of a main magnetic pole 5 that generates a magnetization inversion magnetic field, information is recorded by causing a recording medium 7 to magnetically resonate or to be magnetically inverted with a high frequency magnetic field generated from the magnetization high-speed rotation body. A mechanism for reducing a component applied to a magnetization rotation plane of the magnetization high-speed rotation body out of leakage magnetic field from the main magnetic pole applied to the magnetization high-speed rotation body, for example, a mechanism for tilting a main magnetic pole side plane so as to separate from the magnetization high-speed rotation body, is used. COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：通过在微波辅助记录中稳定产生高频磁场的磁化高速旋转体的操作，提供具有高可靠性的高密度信息记录装置。解决方案：磁化高速旋转体2布置在产生磁化反转磁场的主磁极5附近，通过使记录介质7磁共振或磁转而被记录信息，从磁化高速旋转体产生的高频磁场。用于减少施加到磁化高速旋转体的主磁极的泄漏磁场中施加到磁化高速旋转体的磁化旋转平面的分量的机构，例如用于使主磁场倾斜的机构使用与磁化高速旋转体分离的极侧平面。版权所有（C）2011，JPO＆INPIT

20. 发明专利

JP2007149155A Magnetic recording medium, its manufacturing method, and magnetic disk drive 审中-公开
标题翻译：磁记录介质，其制造方法和磁盘驱动
公开(公告)号：JP2007149155A
公开(公告)日：2007-06-14
申请号：JP2005338388
申请日：2005-11-24
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： IKEGAME HIROSHI , TSUCHIYA HIROKO , IGARASHI KAZUSUKATSU
IPC分类号： G11B5/65 , G11B5/667 , G11B5/855
CPC分类号： G11B5/855
摘要： PROBLEM TO BE SOLVED: To provide a medium manufacturing method, a recording medium and a magnetic disk drive for obtaining high recording density.
SOLUTION: A magnetic layer 1 is formed on a substrate 5 (a), and a nano-grain film 16 is formed on the magnetic layer 1 (b). Then, the nano-gain film is used as a mask, the magnetic layer is subjected to cutting (c), the nano-gain film is removed to form artificial fine magnetic grains 2 (d), and an artificial granular magnetic recording medium is obtained.
COPYRIGHT: (C)2007,JPO&INPIT

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