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    Method and apparatus for controlling head with spin-torque oscillator in a disk drive
    2.
    发明授权
    Method and apparatus for controlling head with spin-torque oscillator in a disk drive 有权
    用于在磁盘驱动器中用自旋扭矩振荡器控制磁头的方法和装置

    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。

    METHOD AND APPARATUS FOR CONTROLLING HEAD WITH SPIN-TORQUE OSCILLATOR IN A DISK DRIVE
    3.
    发明申请
    METHOD AND APPARATUS FOR CONTROLLING HEAD WITH SPIN-TORQUE OSCILLATOR IN A DISK DRIVE 有权
    用旋转扭矩振荡器控制磁头的方法和装置

    公开(公告)号：US20100232053A1

    公开(公告)日：2010-09-16

    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。

    Device for suppressing magnetic noise of dual-layered disk in a disk drive
    4.
    发明申请
    Device for suppressing magnetic noise of dual-layered disk in a disk drive 审中-公开
    用于抑制磁盘驱动器中双层磁盘的磁噪声的装置

    公开(公告)号：US20050002123A1

    公开(公告)日：2005-01-06

    申请号：US10886026

    申请日：2004-07-08

    申请人： Akihiko Takeo ,  Yoichiro Tanaka

    发明人： Akihiko Takeo ,  Yoichiro Tanaka

    IPC分类号： G11B5/667 ,  G11B5/02 ,  G11B5/58 ,  G11B5/64 ,  G11B5/738 ,  G11B17/00

    CPC分类号： G11B5/581

    摘要： There is disclosed a disk drive having a magnetic device for applying a direct current magnetic field to the disk 1 by using a disk with a double-layered structure in which a soft magnetic layer is provided on a lower layer of the recording magnetic layer. The magnetic device generates a direct current magnetic field to uniform a magnetic domain state of the soft magnetic layer of the disk. The intensity of the direct current is larger than the anisotropic magnetic field of the soft magnetic layer and is smaller than the coercive force of the recording magnetic layer. As a consequence, the stabilization of the magnetic domain state of the soft magnetic layer of the disk can be realized to make an attempt of decreasing the magnetic noise and establishing stabilization with respect to the disturbance magnetic field.

    摘要翻译： 公开了一种磁盘驱动器，其具有用于通过使用其中在记录磁性层的下层上提供软磁性层的双层结构的盘将直流磁场施加到盘1的磁性装置。 磁性装置产生直流磁场以使磁盘的软磁性层的磁畴状态均匀。 直流电流的强度大于软磁性层的各向异性磁场，并且小于记录磁性层的矫顽力。 结果，可以实现磁盘的软磁性层的磁畴状态的稳定化，从而试图减小磁噪声并建立相对于扰动磁场的稳定性。

    Device for suppressing magnetic noise of dual-layered disk in a disk drive
    5.
    发明授权
    Device for suppressing magnetic noise of dual-layered disk in a disk drive 有权
    用于抑制磁盘驱动器中双层磁盘的磁噪声的装置

    公开(公告)号：US06791800B2

    公开(公告)日：2004-09-14

    申请号：US09943087

    申请日：2001-08-31

    申请人： Akihiko Takeo ,  Yoichiro Tanaka

    发明人： Akihiko Takeo ,  Yoichiro Tanaka

    IPC分类号： G11B500

    CPC分类号： G11B5/581

    摘要： There is disclosed a disk drive having a magnetic device for applying a direct current magnetic field to the disk 1 by using a disk with a double-layered structure in which a soft magnetic layer is provided on a lower layer of the recording magnetic layer. The magnetic device generates a direct current magnetic field to uniform a magnetic domain state of the soft magnetic layer of the disk. The intensity of the direct current is larger than the anisotropic magnetic field of the soft magnetic layer and is smaller than the coercive force of the recording magnetic layer. As a consequence, the stabilization of the magnetic domain state of the soft magnetic layer of the disk can be realized to make an attempt of decreasing the magnetic noise and establishing stabilization with respect to the disturbance magnetic field.

    摘要翻译： 公开了一种磁盘驱动器，其具有用于通过使用其中在记录磁性层的下层上提供软磁性层的双层结构的盘将直流磁场施加到盘1的磁性装置。 磁性装置产生直流磁场以使磁盘的软磁性层的磁畴状态均匀。 直流电流的强度大于软磁性层的各向异性磁场，并且小于记录磁性层的矫顽力。 结果，可以实现磁盘的软磁性层的磁畴状态的稳定化，从而试图减小磁噪声并建立相对于扰动磁场的稳定性。

    Combination perpendicular record and reproduce head having an auxiliary pole recessed from an air bearing surface and spaced from one of a pair of reproducing element sheilds
    6.
    发明授权
    Combination perpendicular record and reproduce head having an auxiliary pole recessed from an air bearing surface and spaced from one of a pair of reproducing element sheilds 失效
    组合垂直记录和再现头，其具有从空气支承表面凹入并与一对再现元素边界之一间隔开的辅助极

    公开(公告)号：US06618227B2

    公开(公告)日：2003-09-09

    申请号：US09797677

    申请日：2001-03-05

    申请人： Koji Yano ,  Akihiko Takeo

    发明人： Koji Yano ,  Akihiko Takeo

    IPC分类号： G11B539

    CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/00 ,  G11B5/012 ,  G11B5/1278 ,  G11B5/2652 ,  G11B5/4886 ,  G11B2005/0002 ,  G11B2005/0029 ,  G11B2005/3996

    摘要： A magnetic recording apparatus has a two-layered medium of a soft magnetic backing layer and a perpendicular recording layer, and a perpendicular recording head having a recording section including a main magnetic pole, an auxiliary magnetic pole and an exciting coil, and a reproducing section including a reproducing element sandwiched between a pair of reproducing shields, the reproducing section and the recording section being formed separately from each other. The auxiliary magnetic pole is recessed from the air-bearing surface of the main magnetic pole, and the distance between the auxiliary magnetic pole and the reproducing shield positioned adjacent to the auxiliary magnetic pole is set to permit a magnetic field generated under the auxiliary magnetic pole to be larger than a magnetic field under the shield.

    摘要翻译： 磁记录装置具有软磁背衬层和垂直记录层的双层介质，以及具有记录部分的垂直记录头，记录部分包括主磁极，辅助磁极和励磁线圈，再现部分 包括夹在一对再现屏蔽之间的再现元件，再现部分和记录部分彼此分开形成。 辅助磁极从主磁极的空气轴承表面凹入，辅助磁极和与辅助磁极相邻的再生屏蔽之间的距离设定为允许在辅助磁极下产生的磁场 大于屏蔽下的磁场。

    METHOD OF MANUFACTURING MAGNETORESISTIVE ELEMENT
    7.
    发明申请
    METHOD OF MANUFACTURING MAGNETORESISTIVE ELEMENT 失效
    制造磁性元件的方法

    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。

    METHOD AND APPARATUS FOR CORRECTING DATA ERRORS IN A DISK DRIVE
    9.
    发明申请
    METHOD AND APPARATUS FOR CORRECTING DATA ERRORS IN A DISK DRIVE 失效
    用于校正磁盘驱动器中的数据错误的方法和装置

    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。

    Magnetic disk drive including read channel for processing differentiated read signal
    10.
    发明授权
    Magnetic disk drive including read channel for processing differentiated read signal 失效
    磁盘驱动器包括用于处理差分读取信号的读取通道

    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。