公开(公告)号：US09245548B2

公开(公告)日：2016-01-26

申请号：US12011334

申请日：2008-01-25

申请人： Masato Shiimoto ,  Hiroyuki Katada ,  Kazuhiro Nakamoto ,  Hiroyuki Hoshiya

发明人： Masato Shiimoto ,  Hiroyuki Katada ,  Kazuhiro Nakamoto ,  Hiroyuki Hoshiya

IPC分类号： G11B5/39 ,  B82Y10/00 ,  B82Y25/00

CPC分类号： G11B5/3906 ,  B82Y10/00 ,  B82Y25/00 ,  G11B2005/3996 ,  Y10T428/1121

摘要： Embodiments of the present invention help to reduce mag-noise in a magnetoresistive head without deterioration in reproduced output and improve the signal/noise ratio (SNR) of the magnetoresistive head. According to one embodiment, the magnetoresistive head uses a synthetic ferri free layer and it is arranged such that the magnetic field which is applied to an end of a free layer with smaller film thickness and saturation magnetization in the track width direction by a coupling field is larger than the magnetic field which is applied to it by a bias layer.

摘要翻译： 本发明的实施例有助于减少磁阻磁头中的磁噪声，而不会使再现输出变差，并提高磁阻磁头的信噪比（SNR）。 根据一个实施例，磁阻头使用合成的无自由层，并且其布置成使得通过耦合场施加到具有较小膜厚度和磁道宽度方向上的饱和磁化强度的自由层的端部的磁场是 大于通过偏​​置层施加到其的磁场。

公开(公告)号：US20130050866A1

公开(公告)日：2013-02-28

申请号：US13402972

申请日：2012-02-23

申请人： Masato MATSUBARA ,  Masato Shiimoto

发明人： Masato MATSUBARA ,  Masato Shiimoto

IPC分类号： G11B5/127 ,  G11B27/36

CPC分类号： G11B5/3133 ,  G11B2005/0021

摘要： In a magnetic recording device adopting a microwave assisted recording method, a microwave frequency on a positive polarity side and a microwave frequency on a negative polarity side are adjusted to be optimal.The magnetic recording device of the invention supplies to a magnetic head a write current of which a current waveform on the positive polarity side and a current waveform on the negative polarity side are asymmetric.

摘要翻译： 在采用微波辅助记录方法的磁记录装置中，正极侧的微波频率和负极侧的微波频率被调整为最佳。 本发明的磁记录装置向磁头提供正极侧的电流波形和负极侧的电流波形不对称的写入电流。

公开(公告)号：US08284527B2

公开(公告)日：2012-10-09

申请号：US12957229

申请日：2010-11-30

申请人： Nobuo Yoshida ,  Masato Shiimoto ,  Kenichi Akita ,  Kan Yasui

发明人： Nobuo Yoshida ,  Masato Shiimoto ,  Kenichi Akita ,  Kan Yasui

IPC分类号： G11B5/39

CPC分类号： H01L43/08 ,  B82Y25/00 ,  G01R33/093 ,  G01R33/098 ,  G11B5/3912 ,  G11B5/398

摘要： A magnetic head, according to one embodiment, includes a sensor film, a sensor cap film provided above the sensor film, a pair of shields including an upper magnetic shield and a lower magnetic shield which serve as electrodes that pass current in a film thickness direction of the sensor film, a track insulating film contacting both sides of the sensor film in the track width direction, a graded domain control film arranged on both sides in the track width direction of the sensor film adjacent the track insulating film, and an element height direction insulating film positioned on an opposite side of the sensor film relative to an air-bearing surface, wherein an edge position of the element height direction insulating film adjacent the sensor film on the air-bearing surface side is substantially the same as an edge position of the sensor cap film in the element height direction.

摘要翻译： 根据一个实施例的磁头包括传感器膜，设置在传感器膜上方的传感器盖膜，包括上磁屏蔽和下磁屏蔽的一对屏蔽件，其用作使电流在膜厚度方向上通过的电极 传感器膜的传感器膜的两侧接触的轨道绝缘膜，布置在邻近轨道绝缘膜的传感器膜的轨道宽度方向两侧的梯度控制膜和元件高度 相对于空气轴承表面定位在传感器膜的相对侧上的方向绝缘膜，其中与空气轴承表面侧相邻的传感器膜的元件高度方向绝缘膜的边缘位置与边缘位置基本相同 传感器盖膜在元件高度方向上。

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：US08537497B2

公开(公告)日：2013-09-17

申请号：US13402949

申请日：2012-02-23

申请人： Keiichi Nagasaka ,  Masato Shiimoto ,  Yo Sato

发明人： Keiichi Nagasaka ,  Masato Shiimoto ,  Yo Sato

IPC分类号： G11B5/31 ,  G11B5/02 ,  G11B5/23

CPC分类号： G11B5/3146 ,  G11B2005/0024 ,  H01F10/3272 ,  H01F10/3286 ,  H01F10/329 ,  H01L43/08

摘要： In high frequency magnetic assisted recording technique, a spin torque oscillator that stably oscillates at a low current and a magnetic recording head with high recording density are provided. In a magnetic recording head including an oscillator that generates a high frequency magnetic field, a spin injection layer structure of two laminated magnetic layers which are coupled to be anti-parallel is adopted. A product Ms×t of the saturated magnetization Ms and the film thickness t of the first magnetic layer close to a field generation layer is smaller than a product Ms×t of the second magnetic layer remote from the field generation layer.

摘要翻译： 在高频磁辅助记录技术中，提供了以低电流稳定振荡的自旋扭矩振荡器和具有高记录密度的磁记录头。 在包括产生高频磁场的振荡器的磁记录头中，采用耦合为反并联的两个层叠磁性层的自旋注入层结构。 饱和磁化强度Ms的乘积Ms×t和接近场产生层的第一磁性层的膜厚t小于远离场发生层的第二磁性层的乘积Ms×t。

公开(公告)号：US20130057980A1

公开(公告)日：2013-03-07

申请号：US13404029

申请日：2012-02-24

申请人： Masato SHIIMOTO ,  Kenji SUGIURA ,  Mikito SUGIYAMA ,  Isao NUNOKAWA ,  Yo SATO ,  Katsuro WATANABE ,  Kazuhiko HOSOMI ,  Nobuo YOSHIDA

发明人： Masato SHIIMOTO ,  Kenji SUGIURA ,  Mikito SUGIYAMA ,  Isao NUNOKAWA ,  Yo SATO ,  Katsuro WATANABE ,  Kazuhiko HOSOMI ,  Nobuo YOSHIDA

IPC分类号： G11B5/127

CPC分类号： G11B5/314 ,  G11B2005/0024

摘要： The strength of a magnetic field applied from a main pole to an oscillator and the strength of a magnetic field applied from the main pole to a recording medium are improved in a magnetic recording head for microwave assisted recording.In the magnetic recording head according to the present invention, an interval between the main pole and a trailing shield at a place in a position above an air bearing surface is larger than an interval between the main pole and the trailing shield on the air bearing surface.

摘要翻译： 用于微波辅助记录的磁记录头改善了从主极施加到振荡器的磁场的强度和从主极施加到记录介质的磁场的强度。 在根据本发明的磁记录头中，在空气轴承表面上方的位置处的主极和后挡板之间的间隔大于空气轴承表面上的主极和后挡板之间的间隔 。

公开(公告)号：US20130050865A1

公开(公告)日：2013-02-28

申请号：US13402957

申请日：2012-02-23

申请人： Hiroyuki KATADA ,  Yasutaka Nishida ,  Masato Shiimoto

发明人： Hiroyuki KATADA ,  Yasutaka Nishida ,  Masato Shiimoto

IPC分类号： G11B21/02 ,  G11B27/36

CPC分类号： G11B5/1278 ,  G11B5/607 ,  G11B2005/0024

摘要： The present invention enhances reliability by correcting a write error due to unstable oscillation of a spin torque oscillator. In the present invention, a resistance value of a spin torque oscillator is monitored to detect that oscillation becomes unstable during recording. When a measured resistance value is out of a predefined normal range, information for which the recording operation is already performed is rewritten.

摘要翻译： 本发明通过校正由于自旋转矩振荡器的不稳定振荡​​引起的写入误差来提高可靠性。 在本发明中，监视自旋扭矩振荡器的电阻值，以检测在记录期间振荡变得不稳定。 当测量的电阻值超出预定义的正常范围时，重写已经执行了记录操作的信息。

公开(公告)号：US20120147502A1

公开(公告)日：2012-06-14

申请号：US13312413

申请日：2011-12-06

申请人： Yuta Udo ,  Mikito Sugiyama ,  Masato Shiimoto ,  Nobuo Yoshida ,  Kenji Sugiura ,  Masashi Hattori

发明人： Yuta Udo ,  Mikito Sugiyama ,  Masato Shiimoto ,  Nobuo Yoshida ,  Kenji Sugiura ,  Masashi Hattori

IPC分类号： G11B5/127

CPC分类号： G11B5/3163 ,  G11B5/1278 ,  G11B5/3116 ,  G11B5/314 ,  G11B2005/0024

摘要： Minute elements are formed while a photo deviation is suppressed between a spin torque oscillator and a main pole and damage is prevented on the ends of the spin torque oscillator in microwave-assisted recording. A magnetic recording head used for microwave-assisted recording includes: a main pole; a spin torque oscillator that is disposed on the main pole and includes a magnetization high-speed rotation layer for rotating magnetization at a high speed by a spin torque; a protective film that is disposed in the track width direction of the spin torque oscillator; an insulating film formed over the wall surfaces of the main pole and the wall surfaces of the protective film; and a magnetic film formed on the insulating film so as to cover at least the main pole.

摘要翻译： 在微波辅助记录中，在自旋转矩振荡器和主极之间抑制光偏移并且在自旋扭矩振荡器的端部上的损伤被防止时形成分钟元件。 用于微波辅助记录的磁记录头包括：主极; 旋转扭矩振荡器，其设置在所述主极上并且包括用于通过自旋转矩高速旋转磁化的磁化高速旋转层; 保护膜，其设置在所述自旋扭矩振子的轨道宽度方向上; 绝缘膜形成在主极的壁表面和保护膜的壁表面上; 以及形成在所述绝缘膜上以至少覆盖所述主极的磁性膜。

公开(公告)号：US20120120518A1

公开(公告)日：2012-05-17

申请号：US13296866

申请日：2011-11-15

申请人： Masato Matsubara ,  Masato Shiimoto ,  Hiroyuki Katada ,  Keiichi Nagasaka

发明人： Masato Matsubara ,  Masato Shiimoto ,  Hiroyuki Katada ,  Keiichi Nagasaka

IPC分类号： G11B5/02

CPC分类号： G11B5/3146 ,  G11B2005/0024

摘要： In a conventional type magnetic head that performs microwave assisted recording, since a difference in a demagnetizing field between an end and the center of a field generation layer (FGL) grows larger when saturation magnetization of the FGL grows larger, the FGL that generates a microwave is not oscillated in a state of a single domain. Then, a spin-torque oscillator according to the present invention used for a magnetic head for microwave assisted recording is provided with at least one fixed layer, one non-magnetic intermediate layer and one alternating-current magnetic field generation layer respectively and is provided with a structure where saturation magnetization at ends of a film except an end in a direction from an air bearing surface to a surface opposite to it is made smaller than saturation magnetization in the center of the film of the alternating-current magnetic field generation layer.

摘要翻译： 在执行微波辅助记录的常规型磁头中，由于当FGL的饱和磁化强度增大时场强发生层（FGL）的端部和中心之间的消磁场的差异增大，所以产生微波的FGL 在单个域的状态下不振荡。 然后，本发明的用于微波辅助记录磁头的自旋转矩振荡器分别设置有至少一个固定层，一个非磁性中间层和一个交流磁场产生层，并且具有 除了在从空气轴承表面到与其相反的表面的方向上的端部之外，膜的端部处的饱和磁化强度小于交流磁场产生层的膜中心的饱和磁化强度的结构。

公开(公告)号：US20090207531A1

公开(公告)日：2009-08-20

申请号：US12365195

申请日：2009-02-04

申请人： Masato SHIIMOTO ,  Takeshi Nakagawa ,  Hiroyuki Katada ,  Naoto Ito ,  Kenichi Meguro

发明人： Masato SHIIMOTO ,  Takeshi Nakagawa ,  Hiroyuki Katada ,  Naoto Ito ,  Kenichi Meguro

IPC分类号： G11B5/33

CPC分类号： G11B5/3909 ,  B82Y10/00 ,  B82Y25/00 ,  G11B5/3912 ,  G11B5/3967 ,  G11B2005/3996

摘要： A magnetic recording read head is provided capable of achieving high reproduction output, resolution, and SNR, even at a high linear density. There is also provided a magnetic recording and reproducing device capable of achieving sufficient error bit rate. The magnetic recording read head includes a differential read head and a write head. The differential read head has a multilayer structure formed by laminating a first magnetoresistive sensor having a first free layer, a differential gap layer, and a second magnetoresistive sensor having a second free layer. Outside the multilayer structure, a pair of electrodes and a pair of magnetic shields are provided respectively. A ratio (Gl/bl) of an inside distance (Gl) between the first and second free layers to a bit length (bl) is set to 0.6 or more and 1.6 or less.

摘要翻译： 提供了能够实现高再现输出，分辨率和SNR的磁记录读取头，即使在高线性密度下也是如此。 还提供了能够实现足够的错误比特率的磁记录和再现装置。 磁记录读取头包括差分读取头和写入头。 差分读取头具有层叠具有第一自由层，差分间隙层的第一磁阻传感器和具有第二自由层的第二磁阻传感器形成的多层结构。 在多层结构之外，分别设置一对电极和一对磁屏蔽。 将第一自由层与第二自由层之间的内部距离（G1）与比特长度（b1）的比（G1 / b1）设定为0.6以上且1.6以下。