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。

公开(公告)号：US20120275061A1

公开(公告)日：2012-11-01

申请号：US13459610

申请日：2012-04-30

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

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

IPC分类号： G11B5/127 ,  G11B5/17

CPC分类号： G11B5/3146 ,  G11B5/02 ,  G11B5/1278 ,  G11B5/65 ,  G11B2005/0005 ,  G11B2005/0024 ,  H01F10/123 ,  H01L43/08

摘要： According to one embodiment, a magnetic recording device includes a magnetic recording head and a magnetic recording medium. The magnetic recording head includes a main magnetic pole, a shield and a stacked structure. The main magnetic pole has a medium facing surface and a main magnetic pole side surface. The shield has a shield side surface. The stacked structure is provided between the main magnetic pole and shield, and includes first and second magnetic layers, and an intermediate layer. The magnetic recording medium includes a backing layer and a magnetic recording layer. A distance between an end portion of the medium facing surface on a side of the stacked structure and the backing layer is twice or more of a distance between the main magnetic pole side surface and the shield side surface.

摘要翻译： 根据一个实施例，磁记录装置包括磁记录头和磁记录介质。 磁记录头包括主磁极，屏蔽和堆叠结构。 主磁极具有中等面向表面和主磁极侧表面。 屏蔽有屏蔽侧面。 堆叠结构设置在主磁极和屏蔽之间，并且包括第一和第二磁性层以及中间层。 磁记录介质包括背衬层和磁记录层。 层叠结构一侧的介质相对表面的端部与背衬层之间的距离是主磁极侧表面和屏蔽侧表面之间的距离的两倍或更多。

公开(公告)号：US20120019960A1

公开(公告)日：2012-01-26

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： G11B5/82 ,  G11B5/66 ,  G11B5/65

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：US20110228423A1

公开(公告)日：2011-09-22

申请号：US12880676

申请日：2010-09-13

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

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

IPC分类号： G11B5/127 ,  G11B5/48 ,  G11B21/02

CPC分类号： G11B5/3146 ,  G11B5/1278 ,  G11B5/3116 ,  G11B2005/0024

摘要： A magnetic recording head includes a first ferromagnetic layer, an intermediate layer, a third ferromagnetic layer, a first magnetic pole and a second magnetic pole. The intermediate layer is provided between the first ferromagnetic layer and the second ferromagnetic layer. The third ferromagnetic layer includes a CoIr alloy and is provided so that the first ferromagnetic layer is sandwiched between the third ferromagnetic layer and the intermediate layer. The first magnetic pole is provided so that the third ferromagnetic layer is sandwiched between the first magnetic pole and the first ferromagnetic layer. The second magnetic pole is provided so that the second ferromagnetic layer is sandwiched between the second magnetic pole and the intermediate layer.

摘要翻译： 磁记录头包括第一铁磁层，中间层，第三铁磁层，第一磁极和第二磁极。 中间层设置在第一铁磁层和第二铁磁层之间。 第三铁磁层包括CoIr合金，并且被设置为使得第一铁磁层夹在第三铁磁层和中间层之间。 第一磁极被设置成使得第三铁磁层夹在第一磁极和第一铁磁层之间。 第二磁极被设置成使得第二铁磁层夹在第二磁极和中间层之间。

公开(公告)号：US20100073806A1

公开(公告)日：2010-03-25

申请号：US12585459

申请日：2009-09-15

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

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

IPC分类号： G11B21/02 ,  G11B5/127

CPC分类号： G11B5/1278 ,  G11B5/02 ,  G11B5/3133 ,  G11B5/3146 ,  G11B2005/0002 ,  H03B15/006

摘要： It is made possible to improve the recording resolution. A magnetic recording head includes: a magnetic pole that has a first magnetic portion including an air bearing surface, and generates a write magnetic field; and a spin torque oscillator that is formed on the air bearing surface of the magnetic pole, and is formed with a stack structure including a first magnetic layer, a second magnetic layer, and a nonmagnetic layer interposed between the first magnetic layer and the second magnetic layer, the second magnetic layer generating a high-frequency magnetic field when current is applied between the first magnetic layer and the second magnetic layer.

摘要翻译： 可以提高记录分辨率。 磁记录头包括：具有包括空气轴承表面的第一磁性部分并产生写入磁场的磁极; 以及旋转扭矩振荡器，其形成在所述磁极的所述空气支承面上，并且形成有堆叠结构，所述堆叠结构包括介于所述第一磁性层和所述第二磁性层之间的第一磁性层，第二磁性层和非磁性层 层，当第一磁性层和第二磁性层之间施加电流时，第二磁性层产生高频磁场。

公开(公告)号：US07494725B2

公开(公告)日：2009-02-24

申请号：US11085622

申请日：2005-03-22

申请人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

发明人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

IPC分类号： G11B5/66

CPC分类号： G11B5/667 ,  G11B5/65 ,  G11B5/7325

摘要： A grain diameter controlling crystalline layer comprising crystalline grains of a metal selected from the group consisting essentially of Cu, Ni, Rh and Pt was formed on a substrate. Then, deposited atom layer of at least one element selected from the group consisting of oxygen and carbon was formed on the surface of the grain diameter control layer. A magnetic recording layer was deposited on the atoms deposited grain diameter controlling crystalline layer. Then a magnetic recording medium in which the magnetic crystalline grains has small grain diameter and small grain diameter distribution, and the magnetic recording medium shows increased signal to noise ratio at high recording density.

摘要翻译： 在基板上形成包含选自Cu，Ni，Rh和Pt中的金属的晶粒的晶粒直径控制晶体层。 然后，在粒径控制层的表面上形成从由氧和碳组成的组中选出的至少一种元素的沉积原子层。 在原子沉积粒径控制晶体层上沉积磁记录层。 然后是其中磁晶粒具有小的粒径和小的粒径分布的磁记录介质，并且磁记录介质在高记录密度下显示增加的信噪比。

公开(公告)号：US20090011281A1

公开(公告)日：2009-01-08

申请号：US12166592

申请日：2008-07-02

申请人： Soichi Oikawa ,  Tomoyuki Maeda

发明人： Soichi Oikawa ,  Tomoyuki Maeda

IPC分类号： G11B5/33

CPC分类号： G11B5/732 ,  G11B5/66 ,  G11B5/667 ,  Y10T428/115

摘要： According to one embodiment, a perpendicular magnetic recording medium includes a substrate, and a first magnetic layer and a second magnetic layer formed on the substrate, in which supposing that, for the first and second magnetic layers, respectively, uniaxial magnetic anisotropy constants are Ku1 and Ku2, saturation magnetizations are Ms1 and Ms2, anisotropic magnetic fields are Hk1 and Hk2 and the thicknesses are t1 and t2, then following conditions are satisfied that Ku1 and Ku2 are 3×106 erg/cc or more, Ms1 is smaller than Ms2, Hk1 is larger than Hk2 and t1 is larger than t2.

摘要翻译： 根据一个实施例，垂直磁记录介质包括基板，以及形成在基板上的第一磁性层和第二磁性层，其中，对于第一和第二磁性层，单轴磁各向异性常数分别为Ku1 和Ku2，饱和磁化为Ms1和Ms2，各向异性磁场为Hk1和Hk2，厚度为t1和t2，则满足以下条件：Ku1和Ku2为3×106erg / cc或更大，Ms1小于Ms2，Hk1为 大于Hk2和t1大于t2。

公开(公告)号：US20080090002A1

公开(公告)日：2008-04-17

申请号：US11873860

申请日：2007-10-17

申请人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

发明人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

IPC分类号： G11B5/84

CPC分类号： G11B5/667 ,  G11B5/65 ,  G11B5/7325

摘要： A magnetic recording layer is formed on an under-layer comprising a Cu crystalline grain layer and a deposited nitrogen atom layer on the Cu crystalline grain layer surface. Then the magnetic recording layer comprising very small average grain diameter and sharp grain diameter distribution is obtained. The magnetic recording medium comprising the magnetic recording layer shows excellent signal to noise ratio at high density recording.

摘要翻译： 在Cu晶粒层表面上的包含Cu晶粒层和沉积的氮原子层的下层上形成磁记录层。 然后获得包含非常小的平均粒径和尖锐的粒径分布的磁记录层。 包括磁记录层的磁记录介质在高密度记录时显示出优异的信噪比。

公开(公告)号：US08817419B2

公开(公告)日：2014-08-26

申请号：US13171418

申请日：2011-06-28

申请人： Soichi Oikawa ,  Katsuhiko Koui

发明人： Soichi Oikawa ,  Katsuhiko Koui

IPC分类号： G11B5/127 ,  G11B13/08

CPC分类号： G11B5/3146 ,  G11B5/1278 ,  G11B2005/0005 ,  G11B2005/0024

摘要： According to one embodiment, a magnetic recording head includes a main magnetic pole generating a recording magnetic field in a magnetic recording medium, a return yoke paired with the main magnetic pole, and a spin torque oscillator interposed between the main magnetic pole and the return yoke and including a spin injection layer, an oscillation layer, a nonmagnetic metal layer, and spin assist layer stacked in this order, wherein the nonmagnetic metal layer includes at least one metal selected from the group consisting of Cu, Au, Ag, Al, Pd, Pt, Os, and Ir, and the spin assist layer is a soft magnetic layer whose saturation magnetic flux density (Bs), diamagnetic field coefficient (N) and gap magnetic field (Hg) show a relationship expressed by Bs×N>Hg.

摘要翻译： 根据一个实施例，磁记录头包括在磁记录介质中产生记录磁场的主磁极，与主磁极配对的返回磁轭和插在主磁极和返回磁轭之间的自旋扭矩振荡器 并且包括依次层叠的自旋注入层，振荡层，非磁性金属层和自旋辅助层，其中，所述非磁性金属层包含选自Cu，Au，Ag，Al，Pd ，Pt，Os和Ir，自旋辅助层是饱和磁通密度（Bs），反磁场系数（N）和间隙磁场（Hg）表现出由Bs×N> Hg表示的关系的软磁性层 。

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。