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    Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus
    3.
    发明授权
    Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus 失效
    垂直磁记录介质和磁记录/再现装置

    公开(公告)号：US07217467B2

    公开(公告)日：2007-05-15

    申请号：US10699737

    申请日：2003-11-04

    申请人： Reiko Arai ,  Kiwamu Tanahashi ,  Atsushi Kikugawa

    发明人： Reiko Arai ,  Kiwamu Tanahashi ,  Atsushi Kikugawa

    IPC分类号： G11B5/667 ,  G11B5/673

    CPC分类号： G11B5/732 ,  G11B5/667 ,  G11B2005/0029

    摘要： A magnetic recording/reproducing apparatus is disclosed with high storage capability. The apparatus also prevents fluctuation of readback output and decay of magnetization or erasure of recorded magnetization in the recording layer. A soft magnetic underlayer and a perpendicular recording layer are formed in specific order on the substrate of a magnetic disk. The soft magnetic underlayer has a triple-layered structure in which a domain control layer, including an anti-ferromagnetic layer, is sandwiched between two first and second soft magnetic layers. The thickness of the first and second soft magnetic layers (d1, d2) is between 25 nm and 150 nm and a ratio of d1/d2 is within a range of 0.3 to 1.5. Accordingly, magnetic domains in the soft magnetic underlayer of a perpendicular magnetic recording medium can be controlled and magnetic domain wall motion can be inhibited.

    摘要翻译： 公开了具有高存储能力的磁记录/重放装置。 该装置还防止记录层中的回读输出波动和磁化衰减或记录磁化的擦除。 在磁盘的基板上以特定顺序形成软磁性底层和垂直记录层。 软磁性底层具有三层结构，其中包括反铁磁层的域控制层夹在两个第一和第二软磁层之间。 第一和第二软磁性层（d 1，d 2）的厚度为25nm〜150nm，d 1 / d 2的比例为0.3〜1.5。 因此，可以控制垂直磁记录介质的软磁性底层中的磁畴，并且可以抑制磁畴壁运动。

    Perpendicular magnetic recording medium
    5.
    发明授权
    Perpendicular magnetic recording medium 有权
    垂直磁记录介质

    公开(公告)号：US08507115B2

    公开(公告)日：2013-08-13

    申请号：US12559365

    申请日：2009-09-14

    申请人： Reiko Arai ,  Niroyuki Nakagawa

    发明人： Reiko Arai ,  Niroyuki Nakagawa

    IPC分类号： G11B5/667

    CPC分类号： G11B5/732 ,  G11B5/7325 ,  G11B5/82

    摘要： According to one embodiment, a perpendicular magnetic recording medium includes a soft magnetic underlayer having an amorphous structure or a microcrystalline structure, a first seed layer comprised of a magnetic material having an fcc crystal structure including a CoFe alloy formed on a substrate side, and a second seed layer formed on the first seed layer, the second seed layer comprised of a nonmagnetic material having an fcc crystal structure including a NiW alloy. The medium also includes an intermediate layer comprised of Ru or an alloy thereof, a magnetic recording layer, and a protective layer, wherein the layers are sequentially stacked on a substrate in the foregoing order and the protective layer is closer to the substrate than the soft magnetic underlayer. Other embodiments of magnetic recording media, and methods of fabrication, are also described.

    摘要翻译： 根据一个实施例，垂直磁记录介质包括具有非晶结构或微晶结构的软磁性底层，第一晶种层由具有在基板侧形成的CoFe合金的fcc晶体结构的磁性材料构成，以及 形成在第一籽晶层上的第二晶种层，第二晶种层由具有包含NiW合金的fcc晶体结构的非磁性材料构成。 该介质还包括由Ru或它们的合金构成的中间层，磁记录层和保护层，其中按照上述顺序将层依次堆叠在基板上，并且保护层比软件更靠近基板 磁性底层。 还描述了磁记录介质的其它实施例和制造方法。

    Perpendicular magnetic recording medium and magnetic storage apparatus using the same
    6.
    发明申请
    Perpendicular magnetic recording medium and magnetic storage apparatus using the same 有权
    垂直磁记录介质及使用其的磁存储装置

    公开(公告)号：US20080113221A1

    公开(公告)日：2008-05-15

    申请号：US11985310

    申请日：2007-11-13

    申请人： Yoshiyuki Hirayama ,  Ichiro Tamai ,  Reiko Arai

    发明人： Yoshiyuki Hirayama ,  Ichiro Tamai ,  Reiko Arai

    IPC分类号： G11B5/33

    CPC分类号： G11B5/65 ,  G11B5/7325 ,  G11B5/851 ,  Y10T428/11

    摘要： Embodiments in accordance with the present invention help to obtain a perpendicular magnetic recording medium having a granular structure, excellent recording/reproducing properties, and excellent durability. According to one embodiment, a recording layer includes a layer which has crystal grains mainly composed of cobalt and crystal grain boundaries mainly composed of the oxide; the oxygen content of the recoding layer is changed in the film thickness direction; the oxygen content in the area in the vicinity of the interface between the recording layer and the intermediate layer is made lower than the oxygen content in the area in the vicinity of the center of the recording layer; and the oxygen content in the area in the vicinity of the interface between the recording layer and the protective layer is made lower than the oxygen content in the area in the vicinity of the center of the recording layer.

    摘要翻译： 根据本发明的实施例有助于获得具有颗粒结构的良好的记录/再现性能和优异的耐久性的垂直磁记录介质。 根据一个实施例，记录层包括主要由钴构成的晶粒和主要由氧化物构成的晶界的层; 记录层的氧含量在膜厚方向上变化; 记录层和中间层之间的界面附近的区域中的氧含量低于记录层中心附近的区域中的氧含量; 并且将记录层和保护层之间的界面附近的区域中的氧含量设定得低于记录层中心附近的区域中的氧含量。

    Magnetoresistive sensor including magnetic domain control layers having high electric resistivity, magnetic head and magnetic disk apparatus
    8.
    发明申请
    Magnetoresistive sensor including magnetic domain control layers having high electric resistivity, magnetic head and magnetic disk apparatus 失效
    磁阻传感器包括具有高电阻率的磁畴控制层，磁头和磁盘装置

    公开(公告)号：US20050254182A1

    公开(公告)日：2005-11-17

    申请号：US11188695

    申请日：2005-07-26

    申请人： Hiromasa Takahashi ,  Reiko Arai ,  Susumu Soeya

    发明人： Hiromasa Takahashi ,  Reiko Arai ,  Susumu Soeya

    IPC分类号： G01R33/09 ,  G11B5/127 ,  G11B5/33 ,  G11B5/39 ,  H01L43/08

    CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G01R33/09 ,  G11B5/3903 ,  G11B5/3909 ,  G11B5/3932 ,  G11B5/3967 ,  G11B2005/3996

    摘要： A magnetoresistive sensor of the type of flowing a signal sensing current perpendicular to the plane, a magnetic head using the magnetoresistive sensor, and a magnetic disk apparatus, comprising a substrate, a pair of magnetic shield layers consisting of a lower magnetic shield layer and an upper magnetic shield layer, a magnetoresistive sensor layer, disposed between the pair of magnetic shield layers, an electrode terminal for flowing a signal current perpendicular to the plane of the magnetoresistive sensor layer, and magnetic domain control layers for controlling Barkhausen noise of the magnetoresistive sensor layer, the magnetic domain control layers being disposed in contact with opposite ends of the magnetoresistive sensor layer consist of a material having high electric resistivity and with a specific resistance not less than 10 mΩcm.

    摘要翻译： 使垂直于该平面的信号感应电流的类型的磁阻传感器，使用磁阻传感器的磁头和包括基板的磁盘装置，由下磁屏蔽层和 上磁屏蔽层，磁阻传感器层，设置在一对磁屏蔽层之间，用于使垂直于磁阻传感器层的平面的信号电流流过的电极端子和用于控制磁阻传感器的巴克豪森噪声的磁畴控制层 层，与磁阻传感器层的相对端接触的磁畴控制层由具有高电阻率且电阻率不小于10mOggacm的材料组成。

    Magnetic head including magnetoresistive element
    9.
    发明授权
    Magnetic head including magnetoresistive element 失效
    磁头包括磁阻元件

    公开(公告)号：US06249405B1

    公开(公告)日：2001-06-19

    申请号：US09588183

    申请日：2000-06-07

    申请人： Hiroyuki Hoshiya ,  Katsuya Mitsuoka ,  Masaaki Sano ,  Reiko Arai ,  Susumu Soeya ,  Hiroshi Fukui ,  Moriaki Fuyama ,  Fumio Sato

    发明人： Hiroyuki Hoshiya ,  Katsuya Mitsuoka ,  Masaaki Sano ,  Reiko Arai ,  Susumu Soeya ,  Hiroshi Fukui ,  Moriaki Fuyama ,  Fumio Sato

    IPC分类号： G11B539

    CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/09 ,  G11B5/3903 ,  G11B5/3909 ,  G11B5/3919 ,  G11B5/3967 ,  G11B5/398 ,  G11B5/4886 ,  G11B2005/3996

    摘要： A magnetic storage/read system includes a recording medium having tracks, and a magnetic head, including a magnetoresistive element, which reads a magnetic field from the recording medium. The magnetic storage/read system satisfies a relationship of d≦(12.5×103)/Tr where d is a height, expressed in &mgr;m, of the magnetoresistive element in a direction perpendicular to a plane of the recording medium, and Tr is a track density, expressed in tracks per inch, of the tracks of the recording medium. The magnetoresistive element may include a first antiferromagnetic film; a first magnetic film having a magnetization direction which is fixed by magnetic coupling with the first antiferromagnetic film; a second antiferromagnetic film; a second magnetic film having a magnetization direction which is fixed by magnetic coupling with the second antiferromagnetic film; a third magnetic film having a magnetization direction which is able to rotate in response to an applied magnetic field; a first nonmagnetic conductive film disposed between the first magnetic film and the third magnetic film; and a second nonmagnetic conductive film disposed between the second magnetic film and the third magnetic film; wherein the third magnetic film is disposed between the first nonmagnetic conductive film and the second nonmagnetic conductive film, the first magnetic film is disposed between the first antiferromagnetic film and the first nonmagnetic conductive film, and the second magnetic film is disposed between the second antiferromagnetic film and the second nonmagnetic conductive film.

    摘要翻译： 磁存储/读取系统包括具有轨道的记录介质和包括磁阻元件的磁头，其从记录介质读取磁场。 磁存储/读取系统满足d <=（12.5×103）/ Tr的关系，其中d是在垂直于记录介质的平面的方向上的磁阻元件以mum表示的高度，Tr是轨道 密度，以每英寸的轨道表示的记录介质的轨道。 磁阻元件可以包括第一反铁磁膜; 具有通过与第一反铁磁膜的磁耦合固定的磁化方向的第一磁性膜; 第二反铁磁膜; 具有通过与第二反铁磁膜的磁耦合固定的磁化方向的第二磁性膜; 具有能够响应于所施加的磁场而能够旋转的磁化方向的第三磁性膜; 设置在第一磁性膜和第三磁性膜之间的第一非磁性导电膜; 以及设置在所述第二磁性膜和所述第三磁性膜之间的第二非磁性导电膜; 其中所述第三磁性膜设置在所述第一非磁性导电膜和所述第二非磁性导电膜之间，所述第一磁性膜设置在所述第一反铁磁性膜与所述第一非磁性导电膜之间，所述第二磁性膜设置在所述第二反铁磁性膜 和第二非磁性导电膜。