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    Three-dimensional magnetic recording and reproducing apparatus including a plurality of magnetic layers having different resonant frequencies
    1.
    发明授权
    Three-dimensional magnetic recording and reproducing apparatus including a plurality of magnetic layers having different resonant frequencies 有权
    包括具有不同谐振频率的多个磁性层的三维磁记录和重放装置

    公开(公告)号：US09001466B2

    公开(公告)日：2015-04-07

    申请号：US13416815

    申请日：2012-03-09

    申请人： Rie Sato ,  Koichi Mizushima ,  Tazumi Nagasawa ,  Kiwamu Kudo

    发明人： Rie Sato ,  Koichi Mizushima ,  Tazumi Nagasawa ,  Kiwamu Kudo

    IPC分类号： G11B5/00 ,  G11B5/66 ,  G11B5/31 ,  G11B5/82

    CPC分类号： G11B5/66 ,  G11B5/3133 ,  G11B5/82 ,  G11B2005/001

    摘要： According to one embodiment, a three-dimensional magnetic recording and reproducing apparatus includes a magnetic head and a magnetic storage medium. The magnetic head includes a spin-torque oscillator including a free layer, a non-magnetic layer and a fixed layer, magnetization of the free layer being rotatable, the non-magnetic layer being laminated on the free layer, the fixed layer being laminated on the non-magnetic layer, a magnetization direction of the fixed layer being fixed. The magnetic storage medium includes first magnetic layers formed of magnetic materials having different resonant frequencies, each of the first magnetic layers being formed of an in-plane magnetization film and having recording tracks.

    摘要翻译： 根据一个实施例，三维磁记录和再现装置包括磁头和磁存储介质。 磁头包括具有自由层，非磁性层和固定层的自旋转矩振荡器，自由层的磁化可旋转，非磁性层层叠在自由层上，固定层被层压在 非磁性层，固定层的磁化方向固定。 磁存储介质包括由具有不同谐振频率的磁性材料形成的第一磁性层，每个第一磁性层由平面内磁化膜形成并具有记录磁道。

    Magnetic medium and writing and reading method
    2.
    发明授权
    Magnetic medium and writing and reading method 有权
    磁介质和书写方式

    公开(公告)号：US08861120B2

    公开(公告)日：2014-10-14

    申请号：US13571550

    申请日：2012-08-10

    申请人： Tao Yang ,  Hirofumi Suto ,  Tazumi Nagasawa ,  Kiwamu Kudo ,  Rie Sato ,  Koichi Mizushima

    发明人： Tao Yang ,  Hirofumi Suto ,  Tazumi Nagasawa ,  Kiwamu Kudo ,  Rie Sato ,  Koichi Mizushima

    IPC分类号： G11B5/02 ,  G11B5/127 ,  G11B5/82 ,  G11B5/66 ,  G11B5/74 ,  G11B5/00

    CPC分类号： G11B5/746 ,  G11B5/66 ,  G11B5/82 ,  G11B2005/0024

    摘要： According to one embodiment, a magnetic medium includes at least one recording layer including a first magnetic layer, a second magnetic layer and a non-magnetic layer. The first magnetic layer is form of a first magnetic material having a first magnetic anisotropy. The second magnetic layer is made of a second magnetic material having a second magnetic anisotropy different from the first magnetic anisotropy. The non-magnetic layer is made of a non-magnetic material and between the first and second magnetic layers, the first magnetic layer and the second magnetic layer being coupled such that directions of magnetization of the first and second magnetic layers are opposed to each other.

    摘要翻译： 根据一个实施例，磁介质包括至少一个包括第一磁性层，第二磁性层和非磁性层的记录层。 第一磁性层是具有第一磁各向异性的第一磁性材料的形式。 第二磁性层由具有不同于第一磁各向异性的第二磁各向异性的第二磁性材料制成。 非磁性层由非磁性材料制成，并且在第一和第二磁性层之间，第一磁性层和第二磁性层被耦合，使得第一和第二磁性层的磁化方向彼此相对 。

    Spin-torque oscillator, a magnetic sensor and a magnetic recording system
    4.
    发明授权
    Spin-torque oscillator, a magnetic sensor and a magnetic recording system 有权
    旋转扭矩振荡器，磁传感器和磁记录系统

    公开(公告)号：US08174798B2

    公开(公告)日：2012-05-08

    申请号：US12555272

    申请日：2009-09-08

    申请人： Tazumi Nagasawa ,  Kiwamu Kudo ,  Koichi Mizushima ,  Rie Sato

    发明人： Tazumi Nagasawa ,  Kiwamu Kudo ,  Koichi Mizushima ,  Rie Sato

    IPC分类号： G11B5/39

    CPC分类号： G01R33/098 ,  B82Y25/00 ,  G01R33/093 ,  G01R33/1284 ,  G11B5/3903 ,  G11B2005/0002 ,  H01F10/3254 ,  H01F10/3277 ,  H01F10/329 ,  H01L43/08

    摘要： In a spin-torque oscillator, a first ferromagnetic layer, a non-magnetic layer and a second ferromagnetic layer are stacked. A pair of electrodes perpendicularly applies a current onto each plane of the first ferromagnetic layer, the non-magnetic layer and the second ferromagnetic layer. The current induces a precession of a magnetization of at least one of the first ferromagnetic layer and the second ferromagnetic layer. The at least one of the first ferromagnetic layer and the second ferromagnetic layer is formed by an in-plane magnetization film having a uniaxial magnetic anisotropy. A magnetic field generator generates a magnetic field to control a direction of the magnetization so that a non-linearity frequency shift of the precession by the uniaxial magnetic anisotropy cancels a non-linearity frequency shift of the precession by a demagnetizing field on the in-plane magnetization film.

    摘要翻译： 在自旋转矩振荡器中，堆叠第一铁磁层，非磁性层和第二铁磁层。 一对电极垂直地向第一铁磁层，非磁性层和第二铁磁层的每个平面施加电流。 电流引起第一铁磁层和第二铁磁层中的至少一个的磁化的进动。 第一铁磁层和第二铁磁层中的至少一个由具有单轴磁各向异性的平面内磁化膜形成。 磁场发生器产生磁场以控制磁化方向，使得由单轴磁各向异性引起的进动的非线性频移通过平面上的去磁场抵消进动的非线性频移 磁化膜。

    MAGNETIC RECORDING AND REPRODUCING APPARATUS HAVING A MAGNETIC READ HEAD WITH A SPIN-TORQUE OSCILLATOR
    5.
    发明申请
    MAGNETIC RECORDING AND REPRODUCING APPARATUS HAVING A MAGNETIC READ HEAD WITH A SPIN-TORQUE OSCILLATOR 有权
    具有旋转振荡器的磁读头的磁记录和再现装置

    公开(公告)号：US20100053795A1

    公开(公告)日：2010-03-04

    申请号：US12549125

    申请日：2009-08-27

    申请人： Kiwamu Kudo ,  Koichi Mizushima ,  Tazumi Nagasawa ,  Rie Sato

    发明人： Kiwamu Kudo ,  Koichi Mizushima ,  Tazumi Nagasawa ,  Rie Sato

    IPC分类号： G11B15/46

    CPC分类号： G11B5/3903 ,  B82Y25/00 ,  G01R33/093

    摘要： A magnetic recording and reproducing apparatus includes a magnetic head that has a spin-torque oscillator and a magnetic disk and the spin-torque oscillator detects a magnetic field from the magnetic disk and outputs a signal. A criterion used to determine the rotational speed of the magnetic disk, the frequency shift of the spin-torque oscillator produced by a magnetic field from the magnetic disk, a characteristic oscillation frequency of the spin-torque oscillator and the full-width at half maximum of an oscillation spectrum is given in order for a read signal output from the spin-torque oscillator to satisfy a desired signal-to-noise ratio and a magnetic recording and reproducing apparatus is configured based on the criterion.

    摘要翻译： 磁记录和再现装置包括具有自旋扭矩振荡器和磁盘的磁头，并且自旋扭矩振荡器检测来自磁盘的磁场并输出信号。 用于确定磁盘转速的标准，由磁盘产生的磁场产生的自旋扭矩振荡器的频率偏移，自旋转矩振荡器的特征振荡频率和半峰全宽度 为了使自旋转矩振荡器输出的读取信号满足期望的信噪比，并且基于该标准配置磁记录和再现装置，给出振荡频谱。

    MAGNETIC HEAD, MAGNETIC SENSOR, AND MAGNETIC RECORDING/REPRODUCING APPARATUS
    6.
    发明申请
    MAGNETIC HEAD, MAGNETIC SENSOR, AND MAGNETIC RECORDING/REPRODUCING APPARATUS 有权
    磁头，磁传感器和磁记录/再现装置

    公开(公告)号：US20130107395A1

    公开(公告)日：2013-05-02

    申请号：US13655940

    申请日：2012-10-19

    申请人： Tazumi Nagasawa ,  Hirofumi Suto ,  Kiwamu Kudo ,  Rie Sato ,  Koichi Mizushima ,  Tao Yang

    发明人： Tazumi Nagasawa ,  Hirofumi Suto ,  Kiwamu Kudo ,  Rie Sato ,  Koichi Mizushima ,  Tao Yang

    IPC分类号： G11B5/127 ,  G11B5/33 ,  G01R33/12 ,  G11B21/02

    CPC分类号： G01R33/093 ,  B82Y10/00 ,  G11B5/3909 ,  G11B5/3932 ,  G11B2005/3996 ,  Y10T428/11 ,  Y10T428/1171 ,  Y10T428/1193

    摘要： A magnetic head according to an embodiment includes: a spin-torque oscillator comprising a first ferromagnetic layer, a second ferromagnetic layer, a third ferromagnetic layer provided on the opposite side of the second ferromagnetic layer from the first ferromagnetic layer, a first nonmagnetic layer provided between the first ferromagnetic layer and the second ferromagnetic layer, a second nonmagnetic layer provided between the second ferromagnetic layer and the third ferromagnetic layer, a first electrode provided on a surface on the opposite side of the first ferromagnetic layer from the first nonmagnetic layer, and a second electrode provided on a surface on the opposite side of the third ferromagnetic layer from the second nonmagnetic layer. Magnetization precession is induced in each of the first through third ferromagnetic layers when current is applied between the first and second electrodes.

    摘要翻译： 根据实施例的磁头包括：自旋扭矩振荡器，包括第一铁磁层，第二铁磁层，设置在与第一铁磁层相反的第二铁磁层相反侧的第三铁磁层，提供第一非磁性层 在所述第一铁磁层和所述第二铁磁层之间，设置在所述第二铁磁层和所述第三铁磁层之间的第二非磁性层，设置在所述第一铁磁层与所述第一非磁性层相反侧的表面上的第一电极，以及 设置在所述第三铁磁层与所述第二非磁性层相反侧的表面上的第二电极。 当在第一和第二电极之间施加电流时，在第一至第三铁磁层中的每一个中引起磁化进动。

    Magnetic oscillation element
    7.
    发明授权
    Magnetic oscillation element 有权
    磁振元件

    公开(公告)号：US08207806B2

    公开(公告)日：2012-06-26

    申请号：US13216968

    申请日：2011-08-24

    申请人： Kiwamu Kudo ,  Koichi Mizushima ,  Tazumi Nagasawa ,  Rie Sato

    发明人： Kiwamu Kudo ,  Koichi Mizushima ,  Tazumi Nagasawa ,  Rie Sato

    IPC分类号： H01F1/00 ,  H01F3/00 ,  H01F7/00

    CPC分类号： H03B15/006 ,  H01L43/08

    摘要： According to one embodiment, magnetization directions of a magnetic free layer and a magnetic pinned layer are parallel to junction planes between the magnetic free layer and a spacer layer and between the magnetic pinned layer and the spacer layer. The magnetic free layer has a uniaxial magnetic anisotropy, and generates a magnetization oscillation when a current larger than an oscillation threshold current flows through the magnetic free layer. A magnetic field generator controls a magnitude and a direction of an external magnetic field to cancel a shift amount of an oscillation frequency caused by a diamagnetic field due to the magnetization oscillation and a shift amount of the oscillation frequency caused by a magnetic field due to the uniaxial magnetic anisotropy.

    摘要翻译： 根据一个实施例，磁性自由层和磁性被钉扎层的磁化方向平行于磁性自由层和间隔层之间以及磁性被钉扎层和间隔层之间的结面。 磁性自由层具有单轴磁各向异性，并且当大于振荡阈值电流的电流流过无磁层时，产生磁化振动。 磁场发生器控制外部磁场的大小和方向，以抵消由于磁化振动引起的由抗磁场引起的振荡频率的偏移量和由于磁场引起的磁场引起的振荡频率的偏移量 单轴磁各向异性。

    Spin-torque oscillator
    8.
    发明授权
    Spin-torque oscillator 有权
    旋转扭矩振荡器

    公开(公告)号：US08947170B2

    公开(公告)日：2015-02-03

    申请号：US13605093

    申请日：2012-09-06

    申请人： Tao Yang ,  Kiwamu Kudo ,  Tazumi Nagasawa ,  Hirofumi Suto ,  Rie Sato ,  Koichi Mizushima

    发明人： Tao Yang ,  Kiwamu Kudo ,  Tazumi Nagasawa ,  Hirofumi Suto ,  Rie Sato ,  Koichi Mizushima

    IPC分类号： H03B17/00 ,  H03B15/00 ,  G11B5/31 ,  H01F7/02

    CPC分类号： H03B15/006 ,  G11B5/3143 ,  H01F7/0278

    摘要： According to one embodiment, a spin-torque oscillator includes a non-magnetic unit, one or more first magnetic unit, and a second magnetic unit. The non-magnetic unit is formed of a non-magnetic body. The one or more first magnetic unit is connected to the non-magnetic unit and generates a pure spin current indicating the flow of the electron spin that does not accompany an electric charge current. The second magnetic unit is connected to the non-magnetic unit in a manner such that a distance between the second magnetic unit and the first magnetic unit is shorter than a spin diffusion length indicating a distance that an electronic spin polarization is maintained in the non-magnetic unit. The second magnetic unit oscillates by the pure spin current.

    摘要翻译： 根据一个实施例，自旋扭矩振荡器包括非磁性单元，一个或多个第一磁性单元和第二磁性单元。 非磁性单元由非磁性体形成。 一个或多个第一磁性单元连接到非磁性单元并产生指示不伴随电荷电流的电子自旋流动的纯自旋电流。 第二磁性单元以非磁性单元连接到第二磁性单元和第一磁性单元之间的距离短于指示电子自旋极化保持在非磁性单元中的距离的自旋扩散长度， 磁单元。 第二磁单元通过纯自旋电流振荡。

    High-frequency magnetic field generation element and magnetic head
    9.
    发明授权
    High-frequency magnetic field generation element and magnetic head 有权
    高频磁场发生元件和磁头

    公开(公告)号：US08724261B2

    公开(公告)日：2014-05-13

    申请号：US13678062

    申请日：2012-11-15

    申请人： Hirofumi Suto ,  Tao Yang ,  Tazumi Nagasawa ,  Kiwamu Kudo ,  Rie Sato ,  Koichi Mizushima

    发明人： Hirofumi Suto ,  Tao Yang ,  Tazumi Nagasawa ,  Kiwamu Kudo ,  Rie Sato ,  Koichi Mizushima

    IPC分类号： G11B5/31

    CPC分类号： G11B5/187 ,  G11B5/3146 ,  G11B2005/0024 ,  H01F7/00 ,  H01F10/3263 ,  H01F10/3286 ,  H01F10/329 ,  H01L43/08

    摘要： According to one embodiment, a high-frequency magnetic field generation element includes a first fixed layer, a first free layer, and a second free layer. A direction of a magnetization of the first fixed layer is fixed and has a component parallel to a first direction. A direction of a magnetization of the first free layer is variable and has a component orthogonal to the first direction. A direction of a magnetization of the second free layer is variable and has a component orthogonal to the first direction. The first fixed layer is provided between the first free layer and the second free layer. The magnetizations of the first free layer and the second free layer oscillate. A rotation direction of the magnetization of the first free layer is opposite to a rotation direction of the magnetization of the second free layer.

    摘要翻译： 根据一个实施例，高频磁场产生元件包括第一固定层，第一自由层和第二自由层。 第一固定层的磁化方向固定，并且具有平行于第一方向的分量。 第一自由层的磁化方向是可变的并且具有与第一方向垂直的分量。 第二自由层的磁化方向是可变的并且具有与第一方向垂直的分量。 第一固定层设置在第一自由层和第二自由层之间。 第一自由层和第二自由层的磁化振荡。 第一自由层的磁化的旋转方向与第二自由层的磁化的旋转方向相反。