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1. 发明授权

US08363355B2 Microwave-assisted magnetic recording device and method of formation thereof 有权
标题翻译：微波辅助磁记录装置及其形成方法
公开(公告)号：US08363355B2
公开(公告)日：2013-01-29
申请号：US12698834
申请日：2010-02-02
申请人： Masafumi Mochizuki , Masukazu Igarashi
发明人： Masafumi Mochizuki , Masukazu Igarashi
IPC分类号： G11B5/127
CPC分类号： G11B5/314 , G11B5/3146 , G11B2005/0002 , G11B2005/0024
摘要： A magnetic head, according to one embodiment, includes a microwave generator provided with a main magnetic pole, an auxiliary magnetic pole, a coil wound around a magnetic circuit, the magnetic circuit including the main magnetic pole and the auxiliary magnetic pole, and a magnetic film, the film being provided near an ABS side of the main magnetic pole. A first distance in an element thickness direction between film surfaces of the magnetic film and the main magnetic pole at a top end in an element height direction of the microwave generator is greater than a second distance between film surfaces of the magnetic film comprising the microwave generator and the main magnetic pole at the ABS. In other approaches, the main magnetic pole may have a shape which gradually widens from a flare point away from the ABS in an element height direction. Additional systems and methods are also presented.
摘要翻译：根据一个实施例的磁头包括设置有主磁极，辅助磁极，缠绕在磁路上的线圈的微波发生器，包括主磁极和辅助磁极的磁路和磁性磁头胶片，该胶片设置在主磁极的ABS侧附近。在微波发生器的元件高度方向的顶端处的磁性膜和主磁极的膜表面之间的元件厚度方向上的第一距离大于包括微波发生器的磁性膜的膜表面之间的第二距离和ABS的主磁极。在其它方法中，主磁极可以具有在元件高度方向上从喇叭口远离ABS逐渐变宽的形状。还介绍了其他系统和方法。

2. 发明授权

US06251532B1 Magnetic recording medium and magnetic storage device using the same 失效
标题翻译：磁记录介质及使用其的磁存储装置
公开(公告)号：US06251532B1
公开(公告)日：2001-06-26
申请号：US08555415
申请日：1995-11-09
申请人： Masaaki Futamoto , Nobuyuki Inaba , Tomoo Yamamoto , Masukazu Igarashi , Yuzuru Hosoe , Akira Ishikawa
发明人： Masaaki Futamoto , Nobuyuki Inaba , Tomoo Yamamoto , Masukazu Igarashi , Yuzuru Hosoe , Akira Ishikawa
IPC分类号： B32B1501
CPC分类号： G11B5/656 , C22C27/06 , G11B5/64 , G11B5/66 , Y10S428/90
摘要： A magnetic recording medium capable of reducing noise and an error rate of the medium comprises a nonmagnetic substrate; a magnetic layer formed on the surface of the nonmagnetic substrate directly or through a nonmagnetic underlayer; and a protective layer formed on the magnetic layer. The magnetic recording medium satisfies the following relationships: −0.5≦{Hc(1)−Hc(p)}/Hc(1)≦0.3 Hc(1)≧2 kOe 20 G×&mgr;m≦Br(1)×t≦100 G×&mgr;m where Hc(1) is a corecivity of the magnetic layer measured in the longitudinal direction; Hc(p) is a coercivity of the magnetic layer measured in the perpendicular direction; Br(1) is a remanent magnetization of the magnetic layer measured in the longitudinal direction; and “t” is a layer thickness of the magnetic layer.
摘要翻译：能够降低介质的噪声和误差率的磁记录介质包括非磁性衬底; 直接或通过非磁性底层形成在非磁性基片的表面上的磁性层; 以及形成在磁性层上的保护层。磁记录介质满足以下关系：-0.5 <= {Hc（1）-Hc（p）} / Hc（1）<= 0.3Hc（1）> = 2 kOe20 Gxmum <= Br（1）xt < 100 Gxmum其中Hc（1）是沿纵向测量的磁性层的集中度; Hc（p）是在垂直方向上测量的磁性层的矫顽力; Br（1）是沿纵向测量的磁性层的剩磁; “t”为磁性层的层厚。

3. 发明申请

US20120113542A1 OSCILLATOR IN WHICH POLARITY IS CHANGED AT HIGH SPEED, MAGNETIC HEAD FOR MAMR AND FAST DATA TRANSFER RATE HDD 审中-公开
标题翻译：振荡器在高速，磁头上改变了极性，用于传输速率和快速数据传输速率
公开(公告)号：US20120113542A1
公开(公告)日：2012-05-10
申请号：US13287292
申请日：2011-11-02
申请人： Masukazu Igarashi , Yo Sato , Masato Shiimoto , Keiichi Nagasaka
发明人： Masukazu Igarashi , Yo Sato , Masato Shiimoto , Keiichi Nagasaka
IPC分类号： G11B5/127 , G11B21/02
CPC分类号： G11B5/3146 , G11B5/3116 , G11B5/3133 , G11B5/315 , G11B2005/0024
摘要： The present invention provides a magnetic recording head and a magnetic recording device that realize information transfer speed exceeding 1 Gbit/s in microwave assisted magnetic recording applied to a magnetic recording device having recording density exceeding 1 Tbit/in2. Concerning a reference layer that supplies spin torque to a high-speed magnetization rotator serving as a microwave field generation source, when an externally applied field to the reference layer is represented as Hext, a magnetic anisotropy field of the reference layer is represented as Hk, and an effective demagnetizing field in a vertical direction of a film surface of the reference layer is represented as Hd-eff, the fixing layer is configured to satisfy conditions Hext−Hk+Hd-eff>0 and Hext+Hk−Hd-eff>0.
摘要翻译：本发明提供一种在记录密度超过1Tbit / in2的磁记录装置中实现微波辅助磁记录中超过1Gbit / s的信息传送速度的磁记录头和磁记录装置。关于向作为微波场产生源的高速磁化旋转体提供自旋转矩的参考层，当将参考层的外部施加场表示为Hext时，参考层的磁各向异性场表示为Hk，将参考层的膜表面的垂直方向上的有效去磁场表示为Hd-eff，固定层被配置为满足条件Hext-Hk + Hd-eff> 0和Hext + Hk-Hd-eff> 0。

4. 发明授权

US07813071B2 Thermally assisted recording system 有权
标题翻译：热辅助记录系统
公开(公告)号：US07813071B2
公开(公告)日：2010-10-12
申请号：US12287010
申请日：2008-10-02
申请人： Fumiko Akagi , Masukazu Igarashi , Hideki Saga
发明人： Fumiko Akagi , Masukazu Igarashi , Hideki Saga
IPC分类号： G11B5/02
CPC分类号： G11B5/66 , G11B5/02 , G11B5/656 , G11B11/10536 , G11B11/10584 , G11B11/10586 , G11B2005/001 , G11B2005/0021 , H01F10/137 , H01F10/16
摘要： A thermally assisted magnetic recording system is provided to achieve excellent thermal resistance and low noise. In one embodiment, a magnetic recording medium is used, in which the magnetic intergrain exchange coupling is large to let the magnetization be thermally stable by coupling the magnetic grains constituting the recording layer at room temperature (the temperature maintaining the magnetization) and reduced by heating during recording to let the recording magnetization transition slope become steep. Parameter A normalizing the slope around the coercivity of the MH-loop of the medium is 1.5≦A
摘要翻译：提供热辅助磁记录系统以实现优异的耐热性和低噪音。在一个实施例中，使用磁记录介质，其中磁性颗粒间交换耦合大以通过在室温下（构成记录层的磁性颗粒）（保持磁化的温度）并通过加热而减小而使磁化热稳定在记录期间使记录磁化转变斜率变得陡峭。参数使围绕介质MH环的矫顽力的斜率标准化为1.5＆nlE;室温下A <6.0，加热约为1.0。

5. 发明申请

US20070116989A1 Magnetic recording media, its fabrication technique, and hard disk drive 审中-公开
标题翻译：磁记录介质，其制造技术和硬盘驱动器
公开(公告)号：US20070116989A1
公开(公告)日：2007-05-24
申请号：US11602957
申请日：2006-11-22
申请人： Hiroshi Ikekame , Yuko Tsuchiya , Masukazu Igarashi
发明人： Hiroshi Ikekame , Yuko Tsuchiya , Masukazu Igarashi
IPC分类号： G11B5/66 , B05D5/12
CPC分类号： G11B5/855
摘要： Provided is a medium fabrication technique, a recording medium and a hard disk drive, which achieve high recording density. To this end, (a) a magnetic layer is deposited on a substrate, and (b) a nano particle layer is deposited on the magnetic layer. Then, (c) the magnetic layer is etched by use of the nano particle layer as a mask, and (d) the nano particle layer is removed to form artificial magnetic grains, and thus an artificial granular magnetic recording medium is obtained.
摘要翻译：提供了一种实现高记录密度的介质制造技术，记录介质和硬盘驱动器。为此，（a）磁性层沉积在基底上，（b）纳米颗粒层沉积在磁性层上。然后，（c）通过使用纳米粒子层作为掩模蚀刻磁性层，（d）除去纳米粒子层，形成人造磁性粒子，得到人造粒状磁记录介质。

6. 发明授权

US06456448B1 Magnetic recording system including magnetic recording medium having three-dimensional random orientation of axis of easy magnetization 失效
标题翻译：磁记录系统包括磁记录介质，其具有易磁化轴的三维随机取向
公开(公告)号：US06456448B1
公开(公告)日：2002-09-24
申请号：US09435036
申请日：1999-11-05
申请人： Fumiko Akagi , Masukazu Igarashi , Kazuetsu Yoshida , Akira Ishikawa
发明人： Fumiko Akagi , Masukazu Igarashi , Kazuetsu Yoshida , Akira Ishikawa
IPC分类号： G11B502
CPC分类号： G11B5/012 , G11B5/64 , G11B5/82 , G11B2005/001
摘要： A magnetic recording system which can suppress an influence by a thermal fluctuation and is suitable for the high density magnetic recording in which excellent S/N ratio and resolution are obtained is provided. There is provided a magnetic recording system constructed by: a magnetic recording medium having a magnetic layer formed on a substrate through an underlayer; a driving unit for driving the medium in the recording direction; a magnetic head constructed by a recording unit and a reproducing unit; an apparatus for relatively moving the magnetic head to the magnetic recording medium; and a recording reproduction signal processing apparatus for performing a signal input to the magnetic head and an output signal reproduction from the magnetic head, wherein the reproducing unit of the magnetic head is constructed by a magneto-resistance effect type head and the system has a recording magnetization pattern in which a magnetization transition length of the magnetic recording medium is equal to 70 nm or less, the direction of an axis of easy magnetization of the magnetic particles in the magnetic layer of the magnetic recording medium is three-dimensionally oriented. Even after the elapse of 100 hours after the recording and at a linear recording density of 360 kfci, a reproduction output hardly decreases. A degree of deterioration of the S/N ratio of the output to the noises and the resolution are smaller than that of the conventional system.
摘要翻译：能够抑制热波动的影响的磁记录系统，适用于获得优异的S / N比和分辨率的高密度磁记录。提供一种磁记录系统，其通过以下方式构成：磁记录介质，其具有通过底层在基板上形成的磁性层; 用于在记录方向上驱动介质的驱动单元; 由记录单元和再现单元构成的磁头; 用于将磁头相对移动到磁记录介质的装置; 以及用于执行向磁头输入的信号和从磁头再现的输出信号的记录再现信号处理装置，其中磁头的再现单元由磁阻效应型磁头构成，并且系统具有记录磁记录介质的磁化转变长度等于或小于70nm的磁化模式，磁记录介质的磁性层中的磁性颗粒容易磁化的轴的方向是三维取向的。即使在记录100小时后，线性记录密度为360kfci，再现输出几乎不降低。输出与噪声的S / N比和分辨率的劣化程度小于常规系统的劣化程度。

7. 发明授权

US5815343A Magnetic recording medium, process for producing the same and magnetic recording system 失效
标题翻译：磁记录介质，制造过程及磁记录系统
公开(公告)号：US5815343A
公开(公告)日：1998-09-29
申请号：US967346
申请日：1997-10-27
申请人： Akira Ishikawa , Yoshihiro Shiroishi , Yuzuru Hosoe , Yotsuo Yahisa , Tomoo Yamamoto , Masukazu Igarashi , Akira Osaki , Yoshiki Kato , Jun Fumioka
发明人： Akira Ishikawa , Yoshihiro Shiroishi , Yuzuru Hosoe , Yotsuo Yahisa , Tomoo Yamamoto , Masukazu Igarashi , Akira Osaki , Yoshiki Kato , Jun Fumioka
IPC分类号： G11B5/012 , G11B5/39 , G11B5/62 , G11B5/64 , G11B5/66 , G11B5/73 , G11B5/84 , G11B5/78 , G11B5/82 , G11B17/00
CPC分类号： G11B5/012 , G11B5/39 , G11B5/64 , G11B5/656 , G11B5/66 , G11B5/7315 , G11B5/7325 , G11B5/8404
摘要： A magnetic recording medium includes a non-magnetic substrate, and a magnetic layer provided on the non-magnetic substrate. The value of the product Br.sub.1 .delta. of the residual flux density Br.sub.1 of the magnetic layer determined in a recording direction and the thickness .delta. of the magnetic layer is not less than 5 G.mu.m and not more than 180 G.mu.m; the value of the ratio of Br.sub.1 to the residual flux density Br.sub.2 determined in a direction parallel to the substrate plane and perpendicular to the recording direction, Br.sub.1 /Br.sub.2, is not less than 1.3 and not more than 3; the surface of the non-magnetic substrate has texture grooves therein extending predominantly in the recording direction; and the average roughness factor Ra of the surface of the magnetic layer determined in a direction perpendicular to the substrate plane and perpendicular to the recording direction is not less than 0.3 nm and not more than 1.9 nm. Alternatively, the value of the product Br.delta. of the residual flux density Br of the magnetic layer determined in the recording direction and the thickness .delta. of the magnetic layer is not less than 5 G.mu.m and not more than 80 G.mu.m; and the value of the anisotropic magnetic field H.sub.k of the magnetic recording medium is not less than 7 kOe and not more than 20 kOe.
摘要翻译：磁记录介质包括非磁性衬底和设置在非磁性衬底上的磁性层。在记录方向上确定的磁性层的剩余磁通密度Br1和磁性层的厚度δ的乘积Br1δ的值不小于5Gm且不大于180Gm; 在平行于基板平面并垂直于记录方向Br1 / Br2的方向上确定的Br1与剩余通量密度Br2的比值不小于1.3且不大于3; 非磁性基板的表面具有主要在记录方向上延伸的织构槽; 并且在垂直于基板平面并垂直于记录方向的方向上确定的磁性层的表面的平均粗糙度Ra不小于0.3nm且不大于1.9nm。或者，在记录方向上确定的磁性层的剩余磁通密度Br和磁性层的厚度δ的乘积Br delta的值不小于5Gm且不大于80Gm; 并且磁记录介质的各向异性磁场Hk的值不小于7kOe且不大于20kOe。

8. 发明授权

US5561300A Atomic switching devices and logical circuits 失效
标题翻译：原子开关器件和逻辑电路
公开(公告)号：US5561300A
公开(公告)日：1996-10-01
申请号：US994968
申请日：1992-12-22
申请人： Yasuo Wada , Seiichi Kondo , Tsuyoshi Uda , Masukazu Igarashi , Hiroshi Kajiyama , Hisashi Nagano , Akito Sakurai , Tsuneo Ichiguchi
发明人： Yasuo Wada , Seiichi Kondo , Tsuyoshi Uda , Masukazu Igarashi , Hiroshi Kajiyama , Hisashi Nagano , Akito Sakurai , Tsuneo Ichiguchi
IPC分类号： G01Q90/00 , G11B9/00 , G11C11/34 , G11C13/00 , G11C19/00 , H01L27/06 , H01L27/085 , H01L49/00 , H03F3/04 , H03K17/51 , H03K17/54 , H03K17/56 , H03K19/02 , H03K19/08 , H01J37/30 , H02B1/24
CPC分类号： B82Y15/00 , B82Y10/00 , G11B9/14 , G11B9/1463 , G11C11/34 , G11C13/00 , G11C19/00 , H01L27/06 , H01L27/085 , H01L49/00 , H01L49/006 , H03F3/04 , H03K17/51 , H03K17/545 , H03K17/56 , H03K19/02 , H03K19/08 , G11C13/025 , G11C2213/81 , G11C2216/08 , Y10S977/94 , Y10T307/74 , Y10T307/937
摘要： In an atomic switch, opposite ends of an atom wire are connected to an input and output, and a switching gate is connected to a switching power supply. An input signal is outputted when a switching atom is connected to the atom wire, whereas an input signal is not outputted when the switching atom is moved to disconnect from the atom wire. There are provided an atom wire having a plurality of atoms arranged in a line or in a plurality of lines, in a ring shape, or in a curved line, and a switching gate made of an atom wire. The atom wire is switched by the field effect of the switching gate.
摘要翻译：在原子开关中，原子线的相对端连接到输入和输出，并且开关栅极连接到开关电源。当切换原子连接到原子线时输出输入信号，而当切换原子移动以与原子线分离时，输出信号不输出。提供一种原子线，其具有以线状或多条排列成环状或曲线的多个原子以及由原子线构成的开关栅极。原子线由开关栅极的场效应切换。

9. 发明授权

US08547656B2 Spin-torque oscillator (STO) for microwave-assisted magnetic recording (MAMR) and methods of use thereof 有权
标题翻译：用于微波辅助磁记录（MAMR）的自旋扭矩振荡器（STO）及其使用方法
公开(公告)号：US08547656B2
公开(公告)日：2013-10-01
申请号：US13401650
申请日：2012-02-21
申请人： Masukazu Igarashi , Masato Matsubara , Keiichi Nagasaka , Masato Shiimoto
发明人： Masukazu Igarashi , Masato Matsubara , Keiichi Nagasaka , Masato Shiimoto
IPC分类号： G11B5/02
CPC分类号： G11B5/3133 , G11B5/1278 , G11B2005/0024
摘要： In one embodiment, a magnetic data storage system includes a main pole power supply adapted for supplying an excitation current to a main pole coil, a microwave-assisted magnetic recording (MAMR) device including a spin-torque oscillator (STO) element, the STO element having a field generation layer (FGL) and a polarization layer, a timing-control circuit adapted for determining a duration of a main pole magnetic moment inversion process and signaling a start of the main pole magnetic moment inversion process, and a current-regulating circuit comprising an STO power supply adapted for supplying current to the STO element, wherein the STO power supply prevents degradation of a single rotating magnetic domain structure in the FGL into a closure magnetic domain structure in the FGL. Other systems and methods for preventing degradation of the single rotating magnetic domain structure in the FGL into a closure magnetic domain structure are described for more embodiments.
摘要翻译：在一个实施例中，磁数据存储系统包括适于向主极线圈提供激励电流的主极电源，包括自旋转矩振荡器（STO）元件的微波辅助磁记录（MAMR）器件，STO 具有场产生层（FGL）和偏振层的元件，定时控制电路，用于确定主极磁矩反转处理的持续时间并发出主极磁矩反转处理的开始，以及电流调节包括适于向STO元件提供电流的STO电源的电路，其中STO电源防止FGL中的单个旋转磁畴结构的劣化成为FGL中的闭合磁畴结构。对于更多实施例，描述了用于防止FGL中的单个旋转磁畴结构退化成闭合磁畴结构的其它系统和方法。

10. 发明授权

US08089829B2 Thermally assisted recording media and system 失效
标题翻译：热辅助记录媒体和系统
公开(公告)号：US08089829B2
公开(公告)日：2012-01-03
申请号：US12608232
申请日：2009-10-29
申请人： Fumiko Akagi , Masukazu Igarashi , Hiroaki Nemoto , Takayuki Ichihara
发明人： Fumiko Akagi , Masukazu Igarashi , Hiroaki Nemoto , Takayuki Ichihara
IPC分类号： G11B11/00
CPC分类号： G11B5/82 , B82Y10/00 , G11B5/314 , G11B5/65 , G11B5/66 , G11B5/743 , G11B2005/0021
摘要： A thermally assisted magnetic recording medium includes a substrate and at least two, i.e., first and second magnetic recording layers. These layers are hard magnetic layers and contain magnetic grains and a non-magnetic substance magnetically segregating the magnetic grains at grain boundaries. The first magnetic recording layer has a magnetic anisotropy energy Ku1, a grain volume v1, and energy for maintaining its recording magnetization Ku1v1; the second magnetic recording layer has a magnetic anisotropy energy Ku2, a grain volume v2, and energy for maintaining its recording magnetization Ku2v2; and the ratio Ku1v1/kBT of Ku1v1 to a thermal fluctuation energy kBT, where kB represents a Boltzmann constant and T represents an absolute temperature, and the ratio Ku2v2/kBT of Ku2v2 to kBT satisfy the following conditions: Ku1v1/kBT is larger than Ku2v2/kBT at room temperature, but is smaller than Ku2v2/kBT at temperatures around the Curie temperature of the first magnetic recording layer.
摘要翻译：热辅助磁记录介质包括基底和至少两个，即第一和第二磁记录层。这些层是硬磁性层，并且含有磁性颗粒，并且非磁性物质在晶界处磁性地分离磁性颗粒。第一磁记录层具有磁各向异性能Ku1，晶粒体积v1和用于保持其记录磁化强度Ku1v1的能量; 第二磁记录层具有磁各向异性能Ku2，晶粒体积v2和用于保持其记录磁化Ku2v2的能量; Ku1v1 / kBT的Ku1v1 / kBT与热波动能kBT的比值，其中kB表示玻耳兹曼常数，T表示绝对温度，Ku2v2与kBT的Ku2v2 / kBT的比值满足以下条件：Ku1v1 / kBT大于Ku2v2 / kBT，但在第一磁记录层的居里温度附近的温度下小于Ku2v2 / kBT。

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