公开(公告)号：US20110261478A1

公开(公告)日：2011-10-27

申请号：US13092044

申请日：2011-04-21

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： G11B5/02 ,  G11B5/39

CPC分类号： G11B5/3909 ,  B82Y10/00 ,  B82Y25/00 ,  B82Y40/00 ,  G01R33/093 ,  G01R33/098 ,  G11B5/3906 ,  H01F10/3254 ,  H01F10/3272 ,  H01F41/307 ,  H01F41/325 ,  H01L43/08 ,  Y10T428/1114

摘要： According to one embodiment, a magnetoresistive element includes a stack and a pair of electrodes that allows electric current to flow through the stack in a direction perpendicular to a surface of the stack. The stack includes a cap layer, a magnetization pinned layer, a magnetization free layer provided between the cap layer and the magnetization pinned layer, a tunneling insulator provided between the magnetization pinned layer and the magnetization free layer, and a functional layer provided within the magnetization pinned layer, between the magnetization pinned layer and the tunneling insulator, between the tunneling insulator and the magnetization free layer, within the magnetization free layer, or between the magnetization free layer and the cap layer. The functional layer includes an oxide including at least one element selected from Zn, In, Sn and Cd and at least one element selected from Fe, Co and Ni.

摘要翻译： 根据一个实施例，磁阻元件包括堆叠和​​一对电极，其允许电流沿垂直于堆叠表面的方向流过堆叠。 堆叠包括盖层，磁化钉扎层，设置在盖层和磁化钉扎层之间的无磁化层，设置在磁化钉扎层和磁化自由层之间的隧道绝缘体，以及设置在磁化层中的功能层 在磁化固定层和隧道绝缘体之间，在隧道绝缘体和磁化自由层之间，在磁化自由层内，或在磁化自由层和覆盖层之间。 功能层包括包含选自Zn，In，Sn和Cd中的至少一种元素的氧化物和选自Fe，Co和Ni中的至少一种元素。

公开(公告)号：US08012613B2

公开(公告)日：2011-09-06

申请号：US12663350

申请日：2008-06-06

申请人： Migaku Takahashi ,  Shin Saito ,  Tomoyuki Maeda ,  Akihiko Takeo ,  Yuzo Sasaki ,  Ryuji Sakaguchi

发明人： Migaku Takahashi ,  Shin Saito ,  Tomoyuki Maeda ,  Akihiko Takeo ,  Yuzo Sasaki ,  Ryuji Sakaguchi

IPC分类号： G11B5/66

CPC分类号： G11B5/732 ,  Y10T428/11

摘要： A magnetic recording medium is provided, which has at least one soft magnetic layer, at least one seed layer, at least one underlayer and at least one perpendicular magnetic recording layer, and is characterized in that the or each seed layer is comprised of a covalently bonded material. The covalently bonded material preferably predominantly comprises a nitride having a hexagonal crystal structure, more preferably, predominantly comprises aluminum nitride having a hexagonal wurtzite crystal structure. This magnetic recording medium is superior in recording and reproducing an information with high density.

摘要翻译： 提供了一种磁记录介质，其具有至少一个软磁层，至少一个种子层，至少一个底层和至少一个垂直磁记录层，其特征在于该或每个种子层由共价 粘合材料。 共价键合的材料优选主要包含具有六方晶系结构的氮化物，更优选主要包含具有六方纤锌矿晶体结构的氮化铝。 这种磁记录介质在高密度记录和再现信息方面是优越的。

公开(公告)号：US20110151280A1

公开(公告)日：2011-06-23

申请号：US12675090

申请日：2008-08-28

申请人： Migaku Takahashi ,  Shin Saito ,  Gohei Kurokawa ,  Yuzo Sasaki ,  Tatsu Komatsuda ,  Atsushi Hashimoto ,  Akihiko Takeo ,  Tomoyuki Maeda

发明人： Migaku Takahashi ,  Shin Saito ,  Gohei Kurokawa ,  Yuzo Sasaki ,  Tatsu Komatsuda ,  Atsushi Hashimoto ,  Akihiko Takeo ,  Tomoyuki Maeda

IPC分类号： G11B5/66 ,  G11B5/127 ,  C23C14/34 ,  C30B23/02

CPC分类号： G11B5/732 ,  G11B5/7325 ,  G11B5/8404 ,  G11B5/851

摘要： A perpendicular magnetic recording medium including at least a soft under layer, an orientation control layer, a magnetic recording layer and a protective layer on a non-magnetic substrate, wherein the orientation control layer is composed of three or more layers including a seed layer, a first intermediate layer and a second intermediate layer sequentially, formed in that order from the substrate side, the crystal grains that constitute the first intermediate layer are epitaxially grown on the crystal grains of the seed layer, the crystal grains that constitute the second intermediate layer are epitaxially grown on the crystal grains of the first intermediate layer, and the crystal grains that constitute the second intermediate layer are finer than the crystal grains that constitute the first intermediate layer.

摘要翻译： 一种在非磁性基板上至少含有软底层，取向控制层，磁记录层和保护层的垂直磁记录介质，其中所述取向控制层由三层或更多层构成，包括种子层， 从衬底侧依次形成第一中间层和第二中间层，构成第一中间层的晶粒在籽晶层的晶粒上外延生长，构成第二中间层的晶粒 在第一中间层的晶粒上外延生长，构成第二中间层的晶粒比构成第一中间层的晶粒更细。

公开(公告)号：US20100173175A1

公开(公告)日：2010-07-08

申请号：US12663350

申请日：2008-06-06

申请人： Migaku Takahashi ,  Shin Saito ,  Tomoyuki Maeda ,  Akihiko Takeo ,  Yuzo Sasaki ,  Ryuji Sakaguchi

发明人： Migaku Takahashi ,  Shin Saito ,  Tomoyuki Maeda ,  Akihiko Takeo ,  Yuzo Sasaki ,  Ryuji Sakaguchi

IPC分类号： G11B5/33 ,  B05D5/12

CPC分类号： G11B5/732 ,  Y10T428/11

摘要： A magnetic recording medium is provided, which has at least one soft magnetic layer, at least one seed layer, at least one underlayer and at least one perpendicular magnetic recording layer, and is characterized in that the or each seed layer is comprised of a covalently bonded material. The covalently bonded material preferably predominantly comprises a nitride having a hexagonal crystal structure, more preferably, predominantly comprises aluminum nitride having a hexagonal wurtzite crystal structure. This magnetic recording medium is superior in recording and reproducing an information with high density.

摘要翻译： 提供了一种磁记录介质，其具有至少一个软磁层，至少一个种子层，至少一个底层和至少一个垂直磁记录层，其特征在于该或每个种子层由共价 粘合材料。 共价键合的材料优选主要包含具有六方晶系结构的氮化物，更优选主要包含具有六方纤锌矿晶体结构的氮化铝。 这种磁记录介质在高密度记录和再现信息方面是优越的。

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。

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。

公开(公告)号：US06707643B2

公开(公告)日：2004-03-16

申请号：US09951382

申请日：2001-09-14

申请人： Akihiko Takeo ,  Tetsuya Roppongi ,  Shinichi Horinouchi ,  Haruyuki Morita ,  Mikio Matsuzaki

发明人： Akihiko Takeo ,  Tetsuya Roppongi ,  Shinichi Horinouchi ,  Haruyuki Morita ,  Mikio Matsuzaki

IPC分类号： G11B5147

CPC分类号： G11B5/00 ,  G11B5/1278 ,  G11B2005/0002 ,  G11B2005/0029

摘要： A perpendicular magnetic recording apparatus includes a perpendicular double-layer film medium including a stack of a soft magnetic backing layer and a perpendicular magnetic recording layer in which recording is performed under a condition that a recording track pitch as a total of a recording track width and a guard-band width between recording tracks is set to be 1 &mgr;m or less, and a perpendicular magnetic recording head including a recording main pole, an auxiliary pole disposed at a gap having a length of five or less times the guard-band width with respect to the recording main pole, and an exciting coil.

摘要翻译： 垂直磁记录装置包括垂直双层膜介质，其包括软磁背衬层和垂直磁记录层的堆叠，其中在记录磁道间距作为记录磁道宽度的总和的条件下执行记录， 记录轨道之间的保护带宽度设定为1um或更小，以及垂直磁记录头，包括记录主极，辅助极设置在保护带宽度的五倍或更小的间隔处， 相对于记录主极和励磁线圈。

公开(公告)号：US09222994B2

公开(公告)日：2015-12-29

申请号：US13200148

申请日：2011-09-19

申请人： Yuchen Zhou ,  Kunliang Zhang ,  Min Li ,  Kenichi Takano ,  Joe Smyth ,  Moris Dovek ,  Akihiko Takeo ,  Tomomi Funayama ,  Masahiro Takashita ,  Masayuki Takagishi

发明人： Yuchen Zhou ,  Kunliang Zhang ,  Min Li ,  Kenichi Takano ,  Joe Smyth ,  Moris Dovek ,  Akihiko Takeo ,  Tomomi Funayama ,  Masahiro Takashita ,  Masayuki Takagishi

IPC分类号： G01R23/02 ,  G01R33/12 ,  G11B5/39 ,  H01L43/08 ,  G11C11/16

CPC分类号： G01R33/1284 ,  G11B5/3903 ,  G11C11/161 ,  G11C11/1673 ,  G11C11/1675 ,  H01L43/08

摘要： A method for measuring the frequency in a spin torque oscillator having at least a magnetic oscillation layer (MOL), junction layer, and magnetic reference layer (MRL) is disclosed. In a first embodiment, a small in-plane magnetic field is applied to the STO after a DC current is applied to excite the MOL into an oscillation state. The MRL has a perpendicular magnetization that is tilted slightly to give an in-plane magnetization component to serve as a reference layer for measuring the oscillation frequency of the MOL in-plane magnetization component. An AC voltage change is produced in the DC current as a result of variable STO resistance and directly correlates to MOL oscillation frequency. Alternatively, a field having both perpendicular and in-plane components may be applied externally or by forming the STO between two magnetic poles thereby producing an in-plane magnetization reference component in the MRL.

摘要翻译： 公开了一种用于测量至少具有磁振荡层（MOL），结层和磁参考层（MRL）的自旋转矩振荡器中的频率的方法。 在第一实施例中，在施加DC电流以将MOL激发到振荡状态之后，将小的面内磁场施加到STO。 MRL具有稍微倾斜的垂直磁化，以产生面内磁化分量，用作用于测量MOL面内磁化分量的振荡频率的参考层。 作为可变STO电阻的结果，在DC电流中产生AC电压变化，并直接与MOL振荡频率相关。 或者，具有垂直和平面内部分量的场可以在外部施加，或者通过在两个磁极之间形成STO，从而在MRL中产生面内磁化参考分量。

公开(公告)号：US09099143B2

公开(公告)日：2015-08-04

申请号：US13541359

申请日：2012-07-03

申请人： Kazutaka Takizawa ,  Kaori Kimura ,  Takeshi Iwasaki ,  Akihiko Takeo

发明人： Kazutaka Takizawa ,  Kaori Kimura ,  Takeshi Iwasaki ,  Akihiko Takeo

IPC分类号： B44C1/22 ,  G11B5/855 ,  G11B5/31

CPC分类号： G11B5/855 ,  G11B5/3163

摘要： According to at least one embodiment, a metal peelable layer and a mask layer are formed on a magnetic recording layer, then, a projections pattern is formed on the mask layer, the projections pattern is transferred to the metal peelable layer and the magnetic recording layer in this order, and then the metal peelable layer is dissolved and removed by a solvent. The metal peelable layer is constituted of any of aluminum and an aluminum compound. An alkali solution is used as the solvent.

摘要翻译： 根据至少一个实施例，在磁记录层上形成金属可剥离层和掩模层，然后在掩模层上形成突起图案，将突起图案转印到金属剥离层和磁记录层 然后将金属可剥离层溶解并通过溶剂除去。 金属剥离层由铝和铝化合物中的任一种构成。 使用碱溶液作为溶剂。

公开(公告)号：US08968526B2

公开(公告)日：2015-03-03

申请号：US12692354

申请日：2010-01-22

申请人： Shingo Sasaki ,  Shin Saito ,  Migaku Takahashi ,  Atsushi Hashimoto ,  Yuzo Sasaki ,  Gohei Kurokawa ,  Tomoyuki Maeda ,  Akihiko Takeo

发明人： Shingo Sasaki ,  Shin Saito ,  Migaku Takahashi ,  Atsushi Hashimoto ,  Yuzo Sasaki ,  Gohei Kurokawa ,  Tomoyuki Maeda ,  Akihiko Takeo

IPC分类号： C23C14/34 ,  G11B5/851 ,  C23C14/14 ,  G11B5/65 ,  G11B5/82

CPC分类号： G11B5/851 ,  C23C14/14 ,  C23C14/34 ,  G11B5/65 ,  G11B5/82 ,  Y02T50/67

摘要： There are provided a method for manufacturing a magnetic recording medium which is excellent in terms of both the recording and reproduction characteristics and the thermal fluctuation characteristics without reducing the density and hardness of the perpendicular magnetic layer; a magnetic recording medium; and a magnetic recording and reproducing apparatus with which an excellent recording density is achieved, wherein, in the method for manufacturing the magnetic recording medium, at least a portion of the perpendicular magnetic layer 4 is formed as a magnetic layer having a granular structure that contains Co as a major component and also contains an oxide of at least one nonmagnetic metal selected from the group consisting of Cr, Si, Ta, Al, Ti, W and Mg; a target for forming the perpendicular magnetic layer 4 by the sputtering process is prepared so as to include an oxide of Co and a compound of Co and at least one nonmagnetic metal selected from the group consisting of Cr, Si, Ta, Al, Ti, W and Mg, and to make the proportion of oxygen contained in the target higher than the proportion of oxygen contained in the perpendicular magnetic layer 4; and a sputtering gas pressure at the time of forming the perpendicular magnetic layer is set to 1 Pa or less.

摘要翻译： 提供了一种在不降低垂直磁性层的密度和硬度的情况下，在记录和再现特性以及热波动特性方面优异的磁记录介质的制造方法; 磁记录介质; 以及实现了良好的记录密度的磁记录和重放装置，其中在磁记录介质的制造方法中，垂直磁性层4的至少一部分形成为具有粒状结构的磁性层， Co作为主要成分，还含有选自Cr，Si，Ta，Al，Ti，W和Mg中的至少一种非磁性金属的氧化物; 制备通过溅射法形成垂直磁性层4的目标，以便包括Co的氧化物和Co的化合物和选自Cr，Si，Ta，Al，Ti的至少一种非磁性金属， W和Mg，并使靶中含有的氧的比例高于垂直磁性层4中所含的氧的比例; 在形成垂直磁性层时的溅射气体压力设定为1Pa以下。