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1. 发明申请

US20130107395A1 MAGNETIC HEAD, MAGNETIC SENSOR, AND MAGNETIC RECORDING/REPRODUCING APPARATUS 有权
标题翻译：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。

2. 发明授权

US08207806B2 Magnetic oscillation element 有权
标题翻译：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。

3. 发明授权

US09001466B2 Three-dimensional magnetic recording and reproducing apparatus including a plurality of magnetic layers having different resonant frequencies 有权
标题翻译：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。

4. 发明授权

US08861120B2 Magnetic medium and writing and reading method 有权
标题翻译：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。

5. 发明授权

US08553372B2 Magnetic oscillator 有权
公开(公告)号：US08553372B2
公开(公告)日：2013-10-08
申请号：US13430074
申请日：2012-03-26
申请人： Tazumi Nagasawa , Kiwamu Kudo , Rie Sato , Koichi Mizushima
发明人： Tazumi Nagasawa , Kiwamu Kudo , Rie Sato , Koichi Mizushima
IPC分类号： G11B5/39
CPC分类号： H03B15/006 , G11B5/3903 , G11B2005/0002 , H01F10/3254 , H01F10/3272 , H01F10/3286 , H01F10/329 , H01L43/08
摘要： According to one embodiment, a magnetic oscillator includes a layered film and a pair of electrodes. The layered film includes a first ferromagnetic layer, an insulating layer stacked on the first ferromagnetic layer, and a second ferromagnetic layer stacked on the insulating layer. The pair of electrodes is configured to apply a current to the layered film in a direction perpendicular to a film surface of the layered film. Regions having different resistance area products are provided between the first ferromagnetic layer and the second ferromagnetic layer.

6. 发明授权

US08174798B2 Spin-torque oscillator, a magnetic sensor and a magnetic recording system 有权
标题翻译：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。

7. 发明申请

US20100053795A1 MAGNETIC RECORDING AND REPRODUCING APPARATUS HAVING A MAGNETIC READ HEAD WITH A SPIN-TORQUE OSCILLATOR 有权
标题翻译：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。

8. 发明授权

US08947170B2 Spin-torque oscillator 有权
标题翻译：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。

9. 发明授权

US08724261B2 High-frequency magnetic field generation element and magnetic head 有权
标题翻译：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。

10. 发明申请

US20130065086A1 REPRODUCING HEAD WITH SPIN-TORQUE OSCILLATOR, AND MAGNETIC RECORDING AND REPRODUCING APPARATUS 有权
标题翻译：用旋转振荡器复制头，磁记录和再现装置
公开(公告)号：US20130065086A1
公开(公告)日：2013-03-14
申请号：US13535785
申请日：2012-06-28
申请人： Kiwamu Kudo , Tazumi Nagasawa , Koichi Mizushima , Rie Sato , Tao Yang , Hirofumi Suto
发明人： Kiwamu Kudo , Tazumi Nagasawa , Koichi Mizushima , Rie Sato , Tao Yang , Hirofumi Suto
IPC分类号： G11B5/33
CPC分类号： G11B5/3903 , G01R33/098 , G01R33/1284 , G11B5/3912 , G11B5/3929 , G11B2005/0002 , H01F10/325 , H01F10/3254 , H01F10/329 , H01F41/325 , Y10T428/1171
摘要： According to one embodiment, a reproducing head includes a spin-torque oscillator and a pair of shield parts. The spin-torque oscillator has a first surface facing a magnetic recording medium. The pair of shield parts each has a second surface facing the magnetic recording medium, the spin-torque oscillator being arranged between the shield parts. A distance between the second surface and the magnetic recording medium is shorter than a distance between the first surface and the magnetic recording medium.
摘要翻译：根据一个实施例，再现头包括自旋扭矩振荡器和一对屏蔽部分。自旋扭矩振荡器具有面向磁记录介质的第一表面。一对屏蔽部分各自具有面向磁记录介质的第二表面，该自旋扭矩振荡器布置在屏蔽部分之间。第二表面和磁记录介质之间的距离比第一表面和磁记录介质之间的距离短。

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