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。

公开(公告)号：US20100195247A1

公开(公告)日：2010-08-05

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。

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。

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。

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。

公开(公告)号：US07446969B2

公开(公告)日：2008-11-04

申请号：US11134088

申请日：2005-05-19

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A围绕介质MH环的矫顽力的斜率标准化在室温下为1.5 <= A <6.0，加热时变为约1.0。

公开(公告)号：US20050259343A1

公开(公告)日：2005-11-24

申请号：US11134088

申请日：2005-05-19

申请人： Fumiko Akagi ,  Masukazu Igarashi ,  Hideki Saga

发明人： Fumiko Akagi ,  Masukazu Igarashi ,  Hideki Saga

IPC分类号： G11B5/64 ,  G11B5/00 ,  G11B5/02 ,  G11B5/65 ,  G11B5/66 ,  G11B5/706 ,  H01F10/13 ,  H01F10/16 ,  G11B5/82

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声。 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A围绕介质MH环的矫顽力的斜率标准化在室温下为1.5 <= A <6.0，加热时变为约1.0。

公开(公告)号：US5906884A

公开(公告)日：1999-05-25

申请号：US518391

申请日：1995-08-15

申请人： Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Joe Inagaki ,  Enji Fujita ,  Takao Yonekawa ,  Mitsuhiro Shoda ,  Akira Kato ,  Yuzuru Hosoe ,  Masukazu Igarashi

发明人： Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Joe Inagaki ,  Enji Fujita ,  Takao Yonekawa ,  Mitsuhiro Shoda ,  Akira Kato ,  Yuzuru Hosoe ,  Masukazu Igarashi

IPC分类号： G11B5/66 ,  G11B5/65 ,  G11B5/73 ,  G11B5/82 ,  G11B33/08

CPC分类号： G11B5/7315 ,  G11B5/7325 ,  G11B5/82 ,  G11B33/08 ,  Y10S428/90

摘要： A magnetic recording medium has a substrate made of a nonmetal nonmagnetic material whose coefficient of linear expansion lies within a range from 0.000013/deg to 0.0001/deg. A magnetic layer is formed on the substrate as a thin polycrystalline film or a thin amorphous film. The magnetic layer has Co as a main component, which exhibits a negative magnetostrictive constant so that its coercive force rises in the direction of compressive strain. The magnetic layer is subjected to an in-plane compressive strain from the substrate due to a difference between the coefficient of thermal expansion of the substrate and the magnetic layer so that high coercivity is obtained in the magnetic layer.

摘要翻译： 磁记录介质具有由非金属非磁性材料制成的基板，其线性膨胀系数在0.000013 / deg至0.0001 / deg的范围内。 作为薄多晶膜或薄的无定形膜，在基板上形成磁性层。 磁性层具有Co作为主要成分，其表现出负的磁致伸缩常数，使其矫顽力沿压缩应变的方向上升。 由于衬底的热膨胀系数与磁性层之间的差异，磁性层受到来自衬底的面内压缩应变，从而在磁性层中获得高的矫顽力。

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。

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。