公开(公告)号：US20120050920A1

公开(公告)日：2012-03-01

申请号：US13186389

申请日：2011-07-19

申请人： Akihiko Takeo ,  Yoshihiko Fuji ,  Hiromi Yuasa ,  Michiko Hara ,  Shuichi Murakami ,  Hideaki Fukuzawa

发明人： Akihiko Takeo ,  Yoshihiko Fuji ,  Hiromi Yuasa ,  Michiko Hara ,  Shuichi Murakami ,  Hideaki Fukuzawa

IPC分类号： H01F1/04 ,  G11B5/48

CPC分类号： G11B5/3903 ,  B82Y25/00 ,  B82Y40/00 ,  G01R33/093 ,  G01R33/098 ,  G11B5/3163 ,  G11B5/3983 ,  H01F10/3259 ,  H01F10/3272 ,  H01F10/3295 ,  H01F41/303 ,  H01F41/325 ,  H01L43/12 ,  Y10T428/1129

摘要： According to one embodiment, a method of manufacturing a magnetoresistive element includes a layered structure and a pair of electrodes, the layered structure including a cap layer, a magnetization pinned layer, a magnetization free layer, a spacer layer and a functional layer provided in the magnetization pinned layer, between the magnetization pinned layer and the spacer layer, between the spacer layer and the magnetization free layer, in the magnetization free layer, or between the magnetization free layer and the cap layer and including an oxide, the method including forming a film including a base material of the functional layer, performing an oxidation treatment on the film using a gas containing oxygen in a form of at least one selected from the group consisting of molecule, ion, plasma and radical, and performing a reduction treatment using a reducing gas on the film after the oxidation treatment.

摘要翻译： 根据一个实施例，制造磁阻元件的方法包括层状结构和一对电极，所述层叠结构包括盖层，磁化固定层，磁化自由层，间隔层和功能层 在磁化被钉扎层和间隔层之间，在间隔层和磁化自由层之间，在磁化自由层中，或在磁化自由层和覆盖层之间并包括氧化物的磁化钉扎层，该方法包括形成 膜，其包括功能层的基材，使用含有选自分子，离子，等离子体和自由基中的至少一种形式的含氧气体，对膜进行氧化处理，并使用 在氧化处理后还原气膜。

公开(公告)号：US20090059417A1

公开(公告)日：2009-03-05

申请号：US12196628

申请日：2008-08-22

申请人： Akihiko Takeo ,  Junichi Akiyama ,  Kenichiro Yamada ,  Hitoshi Iwasaki ,  Masayuki Takagishi ,  Tomomi Funayama ,  Masahiro Takashita ,  Mariko Shimizu

发明人： Akihiko Takeo ,  Junichi Akiyama ,  Kenichiro Yamada ,  Hitoshi Iwasaki ,  Masayuki Takagishi ,  Tomomi Funayama ,  Masahiro Takashita ,  Mariko Shimizu

IPC分类号： G11B21/02 ,  G11B5/33

CPC分类号： G11B5/314 ,  G11B5/02 ,  G11B5/1278 ,  G11B2005/0005 ,  G11B2005/0024

摘要： According to one embodiment, a disk drive having a spin torque oscillator and designed to perform high frequency assisted writing. The disk drive has a magnetic disk, a magnetic head, a coil, and a drive current controller. The drive current controller controls a drive current to supply to the spin torque oscillator. To record data magnetically in the disk, the drive current controller supplies to the spin torque oscillator the drive current that changes in synchronism with the polarity inversion of the recording current supplied to the coil, which excites the recording magnetic pole of the magnetic head.

摘要翻译： 根据一个实施例，一种具有自旋扭矩振荡器并被设计成执行高频辅助写入的盘驱动器。 磁盘驱动器具有磁盘，磁头，线圈和驱动电流控制器。 驱动电流控制器控制驱动电流供应到自旋扭矩振荡器。 为了将数据磁性地记录在盘中，驱动电流控制器向旋转转矩振荡器提供驱动电流，该驱动电流与提供给线圈的记录电流的极性反转同步地变化，这激励磁头的记录磁极。

公开(公告)号：US20080297936A1

公开(公告)日：2008-12-04

申请号：US12103922

申请日：2008-04-16

申请人： Akihiko Takeo

发明人： Akihiko Takeo

IPC分类号： G11B5/09

CPC分类号： G11B20/1833 ,  G11B2220/2516

摘要： According to one embodiment, a disk drive that effectively corrects data errors, which are changes in the total number of data bits at the time of reproducing the data. The disk drive has a disk and a disk controller. The disk has a data-recording area constituted by a set of magnetic dots that are physically separated from one another. The disk controller uses error-correcting codes, determining an error that shows a change in the total number of bits in a data-bit string of the data set reproduced.

摘要翻译： 根据一个实施例，磁盘驱动器有效地校正数据错误，这是在再现数据时数据位的总数的变化。 磁盘驱动器具有磁盘和磁盘控制器。 磁盘具有由物理上彼此分离的一组磁点构成的数据记录区域。 磁盘控制器使用纠错码，确定显示重放的数据集的数据位串中总位数变化的错误。

公开(公告)号：US06894855B2

公开(公告)日：2005-05-17

申请号：US10228323

申请日：2002-08-27

申请人： Yuka Aoyagi ,  Akihiko Takeo

发明人： Yuka Aoyagi ,  Akihiko Takeo

IPC分类号： G11B5/65 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B5/39 ,  G11B5/667

CPC分类号： B82Y10/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B2005/0016 ,  G11B2005/0029

摘要： A disk drive of perpendicular magnetic recording method including a read head comprising a GMR element and a drive using a double-layered disk medium, is disclosed. In the magnetic field response characteristic of the GMR element, the relationship between the degree of nonlinearity and a pulse width at 50% threshold (PW50) of a differentiated read signal is used. The degree of nonlinearity of the GMR element is adjusted such that the PW50 is smaller than the maximum value. The read channel comprises a differentiation circuit for converting the read signal output from the GMR element into the differentiated read signal.

摘要翻译： 公开了一种包括具有GMR元件的读取头和使用双层盘介质的驱动器的垂直磁记录方法的磁盘驱动器。 在GMR元件的磁场响应特性中，使用非线性度与微分读信号的50％阈值（PW50）之间的脉冲宽度之间的关系。 调整GMR元件的非线性度使得PW50小于最大值。 读通道包括用于将从GMR元件输出的读取信号转换为差分读取信号的微分电路。

公开(公告)号：US08929031B2

公开(公告)日：2015-01-06

申请号：US13291777

申请日：2011-11-08

申请人： Akihiko Takeo ,  Satoshi Shirotori ,  Kenichiro Yamada ,  Katsuhiko Koui

发明人： Akihiko Takeo ,  Satoshi Shirotori ,  Kenichiro Yamada ,  Katsuhiko Koui

IPC分类号： G11B5/127 ,  G11B5/31 ,  H01F10/32 ,  H01F41/30 ,  H01L43/08 ,  G11B5/00

CPC分类号： G11B5/3163 ,  B82Y40/00 ,  G11B5/1278 ,  G11B5/314 ,  G11B2005/0024 ,  H01F10/325 ,  H01F10/3286 ,  H01F10/329 ,  H01F41/302 ,  H01F41/308 ,  H01L43/08 ,  Y10T29/4902 ,  Y10T29/49032 ,  Y10T428/1186

摘要： According to one embodiment, there is provided a spin torque oscillator including an oscillation layer formed of a magnetic material, a spin injection layer formed of a magnetic material and configured to inject a spin into the oscillation layer, and a current confinement layer including an insulating portion formed of an oxide or a nitride and a conductive portion formed of a nonmagnetic metal and penetrating the insulating portion in a direction of stacking. The conductive portion of the current confinement layer is positioned near a central portion of a plane of a device region including the oscillation layer and the spin injection layer.

摘要翻译： 根据一个实施例，提供了一种自旋扭矩振荡器，其包括由磁性材料形成的振荡层，由磁性材料形成的自旋注入层，并被配置为向振荡层注入自旋;以及电流限制层，其包括绝缘体 由氧化物或氮化物形成的部分和由非磁性金属形成的导电部分，并且在堆叠方向上穿透绝缘部分。 电流限制层的导电部分位于包括振荡层和自旋注入层的器件区域平面的中心部分附近。

公开(公告)号：US08858809B2

公开(公告)日：2014-10-14

申请号：US13607134

申请日：2012-09-07

申请人： Akira Watanabe ,  Kaori Kimura ,  Kazutaka Takizawa ,  Takeshi Iwasaki ,  Tsuyoshi Onitsuka ,  Akihiko Takeo

发明人： Akira Watanabe ,  Kaori Kimura ,  Kazutaka Takizawa ,  Takeshi Iwasaki ,  Tsuyoshi Onitsuka ,  Akihiko Takeo

IPC分类号： B44C1/22 ,  C03C15/00 ,  G11B5/09

CPC分类号： G11B5/855

摘要： A manufacturing method of a magnetic recording medium includes steps of forming a magnetic recording layer, a first mask layer, a second mask layer containing silicon as primary component, a strip layer, a third mask layer, and a resist layer, a step of patterning the resist layer to provide a pattern, steps of transferring the pattern to the third mask layer, to the strip layer, and to the second mask layer, a step of removing the strip layer by wet etching and of stripping the third mask layer and the resist layer above the magnetic recording layer, steps of transferring the pattern to the first mask layer and to the magnetic recording layer, and a step of stripping the first mask layer remaining on the magnetic recording layer.

摘要翻译： 磁记录介质的制造方法包括以下步骤：形成磁记录层，第一掩模层，含硅作为主要成分的第二掩模层，带状层，第三掩模层和抗蚀剂层，图案化步骤 提供图案的抗蚀剂层，将图案转移到第三掩模层的步骤，到带状层和第二掩模层，通过湿法蚀刻去除剥离层并剥离第三掩模层的步骤和 抗蚀剂层，将图案转印到第一掩模层和磁记录层的步骤，以及剥离残留在磁记录层上的第一掩模层的步骤。

公开(公告)号：US08553359B2

公开(公告)日：2013-10-08

申请号：US12853690

申请日：2010-08-10

申请人： Kenichiro Yamada ,  Katsuhiko Koui ,  Mariko Kitazaki ,  Masayuki Takagishi ,  Tomomi Funayama ,  Masahiro Takashita ,  Soichi Oikawa ,  Akihiko Takeo

发明人： Kenichiro Yamada ,  Katsuhiko Koui ,  Mariko Kitazaki ,  Masayuki Takagishi ,  Tomomi Funayama ,  Masahiro Takashita ,  Soichi Oikawa ,  Akihiko Takeo

IPC分类号： G11B5/127

CPC分类号： G11B5/3116 ,  B82Y10/00 ,  G11B5/11 ,  G11B5/315 ,  G11B5/743

摘要： A magnetic recording head includes a magnetic pole, a spin torque oscillator, a first shield and a second shield. The magnetic pole has an air-bearing surface. The spin torque oscillator is provided so that a first side of the spin torque oscillator faces the magnetic pole in a first direction parallel to the air-bearing surface. The first shield includes a granular magnetic material, and is provided so that two portions of the first shield sandwich the spin torque oscillator in a second direction which is parallel to the air-bearing surface and perpendicular to the first direction. The second shield is provided on a second side of the spin torque oscillator opposite to the first side.

摘要翻译： 磁记录头包括磁极，自旋转矩振荡器，第一屏蔽和第二屏蔽。 磁极具有空气轴承表面。 旋转扭矩振荡器被设置成使得旋转扭矩振荡器的第一侧在平行于空气轴承表面的第一方向上面对磁极。 第一屏蔽包括颗粒状磁性材料，并且被设置成使得第一屏蔽的两个部分在平行于空气轴承表面并垂直于第一方向的第二方向上夹住旋转扭矩振荡器。 第二屏蔽设置在与第一侧相反的自旋扭矩振荡器的第二侧上。

公开(公告)号：US08512884B2

公开(公告)日：2013-08-20

申请号：US12675090

申请日：2008-08-28

申请人： Migaku Takahashi ,  Shin Saito ,  Gohei Kurokawa ,  Yuzo Sasaki ,  Tatsu Komatsuda ,  Atsushi Hashimoto ,  Akihiko Takeo ,  Tomoyuki Maeda

发明人： Migaku Takahashi ,  Shin Saito ,  Gohei Kurokawa ,  Yuzo Sasaki ,  Tatsu Komatsuda ,  Atsushi Hashimoto ,  Akihiko Takeo ,  Tomoyuki Maeda

IPC分类号： G11B5/66

CPC分类号： G11B5/732 ,  G11B5/7325 ,  G11B5/8404 ,  G11B5/851

摘要： A perpendicular magnetic recording medium including at least a soft under layer, an orientation control layer, a magnetic recording layer and a protective layer on a non-magnetic substrate, wherein the orientation control layer is composed of three or more layers including a seed layer, a first intermediate layer and a second intermediate layer sequentially, formed in that order from the substrate side, the crystal grains that constitute the first intermediate layer are epitaxially grown on the crystal grains of the seed layer, the crystal grains that constitute the second intermediate layer are epitaxially grown on the crystal grains of the first intermediate layer, and the crystal grains that constitute the second intermediate layer are finer than the crystal grains that constitute the first intermediate layer.

摘要翻译： 一种在非磁性基板上至少含有软底层，取向控制层，磁记录层和保护层的垂直磁记录介质，其中所述取向控制层由三层或更多层构成，包括种子层， 从衬底侧依次形成第一中间层和第二中间层，构成第一中间层的晶粒在籽晶层的晶粒上外延生长，构成第二中间层的晶粒 在第一中间层的晶粒上外延生长，构成第二中间层的晶粒比构成第一中间层的晶粒更细。

公开(公告)号：US08233230B2

公开(公告)日：2012-07-31

申请号：US12693201

申请日：2010-01-25

申请人： Koji Yano ,  Kazuhito Shimomura ,  Akihiko Takeo ,  Masayuki Takagishi ,  Kenichiro Yamada

发明人： Koji Yano ,  Kazuhito Shimomura ,  Akihiko Takeo ,  Masayuki Takagishi ,  Kenichiro Yamada

IPC分类号： G11B21/02

CPC分类号： G11B5/02 ,  G11B5/314 ,  G11B2005/001 ,  G11B2005/0024

摘要： According to one embodiment, a disk drive has a magnetic disk and a magnetic head having a spin-torque oscillator. The disk drive further has a head amplifier IC configured to supply a write signal and a drive signal to the magnetic head. The write signal corresponds to write data. The drive signal is supplied to generate a high-frequency magnetic field. The head amplifier IC continuously supplies a drive signal of normal level to the spin-torque oscillator, and supplies a drive signal of high level higher than the normal level, only for a prescribed time after the polarity inversion of the write signal.

摘要翻译： 根据一个实施例，盘驱动器具有磁盘和具有自旋扭矩振荡器的磁头。 磁盘驱动器还具有被配置为向磁头提供写信号和驱动信号的磁头放大器IC。 写入信号对应于写入数据。 提供驱动信号以产生高频磁场。 头放大器IC连续向自旋转矩振荡器提供正常电平的驱动信号，并且在写入信号的极性反转之后的规定时间内提供高于正常电平的高电平的驱动信号。

公开(公告)号：US07848041B2

公开(公告)日：2010-12-07

申请号：US12103922

申请日：2008-04-16

申请人： Akihiko Takeo

发明人： Akihiko Takeo

IPC分类号： G11B5/09

CPC分类号： G11B20/1833 ,  G11B2220/2516

摘要： According to one embodiment, a disk drive that includes a disk and a disk controller is provided which effectively correct data errors that are generated at the time of reproducing data. The disk has a data-recording area constituted by a set of magnetic dots that are physically separated from one another. The disk controller uses error-correcting codes to determine an error that shows a change in the total number of bits in a data-bit string of the data set reproduced.

摘要翻译： 根据一个实施例，提供了包括盘和盘控制器的盘驱动器，其有效地校正在再现数据时生成的数据错误。 磁盘具有由物理上彼此分离的一组磁点构成的数据记录区域。 磁盘控制器使用纠错码来确定显示重放数据集的数据位串中总位数变化的错误。