公开(公告)号：US08320079B2

公开(公告)日：2012-11-27

申请号：US12457657

申请日：2009-06-17

申请人： Hitoshi Iwasaki ,  Kenichiro Yamada ,  Masayuki Takagishi ,  Tomomi Funayama ,  Masahiro Takashita ,  Mariko Shimizu ,  Soichi Oikawa ,  Katsuhiko Koui

发明人： Hitoshi Iwasaki ,  Kenichiro Yamada ,  Masayuki Takagishi ,  Tomomi Funayama ,  Masahiro Takashita ,  Mariko Shimizu ,  Soichi Oikawa ,  Katsuhiko Koui

IPC分类号： G11B5/127 ,  G11B5/187

CPC分类号： B82Y10/00 ,  B82Y25/00 ,  G11B5/3906 ,  G11B2005/0005 ,  G11B2005/3996

摘要： It is made possible to reduce the write magnetic field generated from the main magnetic pole toward the spin torque oscillator, so as to reduce the variation in the oscillation characteristics of the spin torque oscillator, and reduce the current required for oscillation. The magnetic head assembly includes: a recording magnetic pole; a spin torque oscillator that has first and second magnetic layers, and an intermediate layer interposed between the first and second magnetic layers, the spin torque oscillator generating a high-frequency magnetic field by applying a current between the first and second magnetic layers; and a third magnetic layer that is placed adjacent to at least part of a side face of the second magnetic layer.

摘要翻译： 可以将从主磁极产生的写入磁场减小到自旋转矩振荡器，从而减小自旋转矩振荡器的振荡特性的变化，并且降低振荡所需的电流。 磁头组件包括：记录磁极; 旋转扭矩振荡器，其具有第一和第二磁性层，以及介于所述第一和第二磁性层之间的中间层，所述自旋扭矩振荡器通过在所述第一和第二磁性层之间施加电流而产生高频磁场; 以及与第二磁性层的侧面的至少一部分相邻配置的第三磁性层。

公开(公告)号：US20060269794A1

公开(公告)日：2006-11-30

申请号：US11441184

申请日：2006-05-26

申请人： Soichi Oikawa

发明人： Soichi Oikawa

IPC分类号： G11B5/66

CPC分类号： G11B5/7325 ,  G11B5/8404

摘要： In a perpendicular magnetic recording medium, a multilayered underlayer including a first metal underlayer, a second metal underlayer having no solid solution properties with respect to the first metal underlayer and having a hole, and a third metal underlayer having solid solution properties with respect to the first metal underlayer and having no solid solution properties with respect to the second metal underlayer is formed on a substrate, and a magnetic recording layer is formed on the multilayered underlayer.

摘要翻译： 在垂直磁记录介质中，包括第一金属底层的多层底层，相对于第一金属底层没有固溶性质的具有孔的第二金属底层和相对于第一金属底层具有固溶性质的第三金属底层 在基板上形成第一金属底层并且在第二金属底层上没有固溶性，并且在多层底层上形成磁记录层。

公开(公告)号：US08064244B2

公开(公告)日：2011-11-22

申请号：US12456621

申请日：2009-06-19

申请人： Kunliang Zhang ,  Min Li ,  Yuchen Zhou ,  Soichi Oikawa ,  Kenichiro Yamada ,  Katsuhiko Koui

发明人： Kunliang Zhang ,  Min Li ,  Yuchen Zhou ,  Soichi Oikawa ,  Kenichiro Yamada ,  Katsuhiko Koui

IPC分类号： G11C11/00

CPC分类号： G01R33/098 ,  G01R33/1284 ,  G11C11/161 ,  H01L43/08 ,  H01L43/10 ,  Y10T29/49032 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/49046 ,  Y10T29/49048 ,  Y10T29/49052 ,  Y10T428/1107 ,  Y10T428/1114 ,  Y10T428/1121 ,  Y10T428/1129 ,  Y10T428/1136 ,  Y10T428/1143

摘要： A spin valve structure for a spintronic device is disclosed and includes a composite seed layer made of at least Ta and a metal layer having a fcc(111) or hcp(001) texture to enhance perpendicular magnetic anisotropy (PMA) in an overlying (Co/Ni)x multilayer. The (Co/Ni)x multilayer is deposited by a low power and high Ar pressure process to avoid damaging Co/Ni interfaces and thereby preserving PMA. As a result, only a thin seed layer is required. PMA is maintained even after annealing at 220° C. for 10 hours. Examples of GMR and TMR spin valves are described and may be incorporated in spin transfer oscillators and spin transfer MRAMs. The free layer is preferably made of a FeCo alloy including at least one of Al, Ge, Si, Ga, B, C, Se, Sn, or a Heusler alloy, or a half Heusler alloy to provide high spin polarization and a low magnetic damping coefficient.

摘要翻译： 公开了一种用于自旋电子器件的自旋阀结构，并且包括至少由Ta制成的复合种子层和具有fcc（111）或hcp（001）织构的金属层，以增强覆盖层（Co）中的垂直磁各向异性（PMA） / Ni）x多层。 （Co / Ni）x多层通过低功率和高Ar压力工艺沉积，以避免损坏Co / Ni界面，从而保留PMA。 结果，仅需要薄的种子层。 即使在220℃退火10小时后也保持PMA。 描述了GMR和TMR自旋阀的实例，并且可以结合在自旋转移振荡器和自旋转移MRAM中。 自由层优选由包括Al，Ge，Si，Ga，B，C，Se，Sn或Heusler合金或Heusler合金中的至少一种的FeCo合金制成，以提供高自旋极化和低磁性 阻尼系数。

公开(公告)号：US20100142088A1

公开(公告)日：2010-06-10

申请号：US12588176

申请日：2009-10-06

申请人： Hitoshi Iwasaki ,  Soichi Oikawa ,  Katsuhiko Koui ,  Kenichiro Yamada

发明人： Hitoshi Iwasaki ,  Soichi Oikawa ,  Katsuhiko Koui ,  Kenichiro Yamada

IPC分类号： G11B5/127

CPC分类号： G11B5/3146 ,  G11B5/314 ,  G11B2005/0005 ,  G11B2005/0024 ,  G11C11/161 ,  G11C11/1673 ,  G11C11/1675 ,  H01L43/08 ,  H03B15/006

摘要： A spin torque oscillator includes an amorphous soft magnetic layer, a nonmagnetic layer and a hard magnetic layer. The nonmagnetic layer with a close-packed crystal structure is provided on the amorphous soft magnetic layer. The hard magnetic layer with a close-packed crystal structure and perpendicular magnetic anisotropy is provided on the nonmagnetic layer.

摘要翻译： 自旋转矩振荡器包括非晶软磁层，非磁性层和硬磁层。 在非晶软磁层上提供具有紧密结晶结构的非磁性层。 在非磁性层上提供具有紧密堆积晶体结构和垂直磁各向异性的硬磁性层。

公开(公告)号：US20100007996A1

公开(公告)日：2010-01-14

申请号：US12457657

申请日：2009-06-17

申请人： Hitoshi Iwasaki ,  Kenichiro Yamada ,  Masayuki Takagishi ,  Tomomi Funayama ,  Masahiro Takashita ,  Mariko Shimizu ,  Soichi Oikawa ,  Katsuhiko Koui

发明人： Hitoshi Iwasaki ,  Kenichiro Yamada ,  Masayuki Takagishi ,  Tomomi Funayama ,  Masahiro Takashita ,  Mariko Shimizu ,  Soichi Oikawa ,  Katsuhiko Koui

IPC分类号： G11B5/33

CPC分类号： B82Y10/00 ,  B82Y25/00 ,  G11B5/3906 ,  G11B2005/0005 ,  G11B2005/3996

摘要： It is made possible to reduce the write magnetic field generated from the main magnetic pole toward the spin torque oscillator, so as to reduce the variation in the oscillation characteristics of the spin torque oscillator, and reduce the current required for oscillation. The magnetic head assembly includes: a recording magnetic pole; a spin torque oscillator that has first and second magnetic layers, and an intermediate layer interposed between the first and second magnetic layers, the spin torque oscillator generating a high-frequency magnetic field by applying a current between the first and second magnetic layers; and a third magnetic layer that is placed adjacent to at least part of a side face of the second magnetic layer.

摘要翻译： 可以将从主磁极产生的写入磁场减小到自旋转矩振荡器，从而减小自旋转矩振荡器的振荡特性的变化，并且降低振荡所需的电流。 磁头组件包括：记录磁极; 旋转扭矩振荡器，其具有第一和第二磁性层，以及介于所述第一和第二磁性层之间的中间层，所述自旋扭矩振荡器通过在所述第一和第二磁性层之间施加电流而产生高频磁场; 以及与第二磁性层的侧面的至少一部分相邻配置的第三磁性层。

公开(公告)号：US20050117250A1

公开(公告)日：2005-06-02

申请号：US10943225

申请日：2004-09-17

申请人： Soichi Oikawa

发明人： Soichi Oikawa

IPC分类号： G11B5/31 ,  G11B5/127 ,  G11B5/187 ,  G11B5/48

CPC分类号： G11B5/1278

摘要： A magnetic recording head which records information on a recording medium by a vertical magnetic recording method, the magnetic recording head comprises a magnetic pole piece which generates a recording magnetic flux perpendicular to the recording surface of a recording medium and which includes a side parallel to the track width direction of the recording medium, and a concave part which is made concavely in the side parallel to the track width direction of the recording medium so as to have a longitudinal direction parallel to the recording surface, with the length of the magnetic pole piece in the track width direction of the recording medium being equal to 0.3 micrometers or less.

摘要翻译： 一种磁记录头，其通过垂直磁记录方法将信息记录在记录介质上，磁记录头包括磁极片，该磁极片产生垂直于记录介质的记录表面的记录磁通量，该磁极片包括与 记录介质的轨道宽度方向，以及在与记录介质的轨道宽度方向平行的方向上凹入地形成为具有与记录表面平行的纵向方向的凹形部分，磁极片的长度 在记录介质的轨道宽度方向上等于0.3微米或更小。

公开(公告)号：US08877360B2

公开(公告)日：2014-11-04

申请号：US13303479

申请日：2011-11-23

申请人： Soichi Oikawa

发明人： Soichi Oikawa

IPC分类号： G11B5/673 ,  G11B5/73 ,  G11B5/65 ,  G11B5/66

CPC分类号： G11B5/65 ,  G11B5/66 ,  G11B5/7325

摘要： According to one embodiment, a perpendicular magnetic recording medium includes a substrate, and a multilayered magnetic recording layer formed on the substrate by alternately stacking two or more magnetic layers and two or more nonmagnetic layers. The magnetic layers and nonmagnetic layers of the multilayered magnetic recording layer are continuous layers. The magnetic layer includes a magnetic material portion, and a plurality of pinning sites dispersed in the magnetic material portion and made of a nonmagnetic metal different from a nonmagnetic material as a main component of the nonmagnetic layer. This perpendicular magnetic recording medium has magnetic characteristics by which a gradient α of a magnetization curve near the coercive force is 5 or more.

摘要翻译： 根据一个实施例，垂直磁记录介质包括通过交替堆叠两个或更多个磁性层和两个或更多个非磁性层而形成在衬底上的衬底和多层磁记录层。 多层磁记录层的磁性层和非磁性层是连续层。 磁性层包括磁性材料部分和分散在磁性材料部分中并由不同于非磁性材料的非磁性材料制成的多个钉扎部位作为非磁性层的主要成分。 该垂直磁记录介质具有磁矫顽力附近的磁化曲线的梯度α为5以上的磁特性。

公开(公告)号：US08786973B2

公开(公告)日：2014-07-22

申请号：US13597042

申请日：2012-08-28

申请人： Soichi Oikawa

发明人： Soichi Oikawa

IPC分类号： G11B5/02

CPC分类号： G11B5/1278 ,  G11B2005/0021

摘要： According to one embodiment, a thermally assisted magnetic recording method performs heating at a temperature higher than the ambient temperature of the perpendicular recording medium and lower than a temperature at which a nucleation magnetic field Hn of the recording portion is 0, decreases a coercive force Hc of a recording portion by heating a perpendicular recording medium, and records magnetic information by applying a recording magnetic field from a recording magnetic pole to the recording portion having the decreased coercive force.

摘要翻译： 根据一个实施例，热辅助磁记录方法在高于垂直记录介质的环境温度的温度下进行加热，并且低于记录部分的成核磁场Hn为0的温度，降低矫顽力Hc 通过加热垂直记录介质来记录记录部分，并通过将记录磁场从记录磁极施加到具有降低的矫顽力的记录部分来记录磁信息。

公开(公告)号：US08748017B2

公开(公告)日：2014-06-10

申请号：US13175358

申请日：2011-07-01

申请人： Masatoshi Sakurai ,  Yousuke Isowaki ,  Soichi Oikawa

发明人： Masatoshi Sakurai ,  Yousuke Isowaki ,  Soichi Oikawa

IPC分类号： G11B5/66

CPC分类号： G11B5/855 ,  B82Y10/00 ,  G11B5/746 ,  G11B5/82

摘要： According to one embodiment, a bit patterned medium includes a substrate, and a magnetic recording layer disposed above the substrate and including patterns of protrusions. Each of the protrusions contains a plurality of crystal grains. An average distance between the crystal grains is 0.5 to 3.0 nm in each of the protrusions. The protrusions include first protrusions each having a length of 1 μm or more in a radial direction of the medium and second protrusions each having a length in the radial direction shorter than the length of the first protrusion in the radial direction. Each of the first protrusions has a nucleation field Hn for magnetization reversal and a coercive force Hc satisfying the inequalities, Hn≧1.5 kOe and 0.5 kOe≦Hc−Hn≦1.5 kOe.

摘要翻译： 根据一个实施例，位图案化介质包括衬底和设置在衬底上方并包括突起图案的磁记录层。 每个突起包含多个晶粒。 每个突起中晶粒之间的平均距离为0.5至3.0nm。 突起包括在介质的径向上具有1μm以上的长度的第一突起和在径向上的长度比第一突起的径向的长度短的第二突起。 每个第一突起具有用于磁化反转的成核磁场Hn和满足不等式Hn≥1.5kOe和0.5kOe＆amp; NlE; Hc-Hn＆nlE; 1.5kOe的矫顽力Hc。

公开(公告)号：US20130082787A1

公开(公告)日：2013-04-04

申请号：US13200844

申请日：2011-10-03

申请人： Kunliang Zhang ,  Min Li ,  Yuchen Zhou ,  Soichi Oikawa ,  Hitoshi Iwasaki ,  Kenichiro Yamada ,  Katsuhiko Koui

发明人： Kunliang Zhang ,  Min Li ,  Yuchen Zhou ,  Soichi Oikawa ,  Hitoshi Iwasaki ,  Kenichiro Yamada ,  Katsuhiko Koui

IPC分类号： H03B7/00 ,  C23C14/14 ,  C23C14/35 ,  B05D5/00 ,  B05D3/02

CPC分类号： H03B15/006 ,  C23C14/025 ,  C23C14/165 ,  G11C5/005 ,  G11C11/161 ,  Y10T428/1114

摘要： A spin transfer (torque) oscillator (STO) with a non-magnetic spacer formed between a spin injection layer (SIL) and a field generation layer (FGL), and with an interfacial layer comprised of Fe(100-V)CoV where v is from 5 to 100 atomic % formed between the SIL and non-magnetic spacer is disclosed. A composite seed layer made of Ta and a metal layer having a fcc(111) or hcp(001) texture is used to enhance perpendicular magnetic anisotropy (PMA) in the STO device. The interfacial layer quenches SIL oscillations and thereby stabilizes the SIL against FGL oscillations. The interfacial layer preferably has a thickness from 5 to 50 Angstroms and enhances amplitude (dR/R) in the STO device. The STO device may have a top SIL or bottom SIL configuration. The SIL is typically a laminated structure such as (Co/Ni)X where x is between 5 and 50.

摘要翻译： 具有在自旋注入层（SIL）和场产生层（FGL）之间形成的非磁性间隔物的自旋转移（扭矩）振荡器（STO），以及由Fe（100-V）CoV组成的界面层，其中v 公开了在SIL和非磁性间隔物之间​​形成的5至100原子％。 使用由Ta制成的复合晶种层和具有fcc（111）或hcp（001）结构的金属层来增强STO器件中的垂直磁各向异性（PMA）。 界面层淬灭SIL振荡，从而使SIL稳定于FGL振荡。 界面层优选具有5至50埃的厚度，并且增强STO器件中的振幅（dR / R）。 STO设备可能具有顶部SIL或底部SIL配置。 SIL通常是诸如（Co / Ni）X的层压结构，其中x在5和50之间。