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    Magnetic recording medium, method for producing the same, and magnetic recording apparatus
    1.
    发明授权
    Magnetic recording medium, method for producing the same, and magnetic recording apparatus 失效
    磁记录介质，其制造方法和磁记录装置

    公开(公告)号：US06863998B2

    公开(公告)日：2005-03-08

    申请号：US10307301

    申请日：2002-12-02

    申请人： Tetsunori Koda ,  Nobuyuki Inaba ,  Hideaki Yamanaka ,  Enji Fujita ,  Satoshi Matsunuma

    发明人： Tetsunori Koda ,  Nobuyuki Inaba ,  Hideaki Yamanaka ,  Enji Fujita ,  Satoshi Matsunuma

    IPC分类号： G11B5/64 ,  G11B5/65 ,  G11B5/667 ,  G11B5/73 ,  G11B5/738 ,  G11B5/851 ,  H01F10/16 ,  G11B5/66 ,  G11B5/70

    CPC分类号： G11B5/667 ,  G11B5/653 ,  G11B5/7325 ,  G11B5/851 ,  Y10S428/90

    摘要： A magnetic recording medium 100 comprises, on a substrate 1, a first orientation control layer 2, a second orientation control layer 4, a soft magnetic layer 6, a non-magnetic layer 8, a recording layer 12, and a carbon protective layer 14. The recording layer 12 is formed of an FePt ordered alloy phase which exhibits ferromagnetism and an FePt3 ordered alloy phase which exhibits paramagnetism. Accordingly, the magnetic coupling force, which acts between those of the FePt ordered alloy phase, is broken by the paramagnetic FePt3 ordered alloy phase. The magnetic interaction between those of the FePt ordered alloy phase is reduced, and thus the noise is reduced. Further, the high density recording can be performed, and the medium is excellent in thermal stability, because the FePt ordered alloy having high crystalline magnetic anisotropy is used for the recording layer 12.

    摘要翻译： 磁记录介质100在基板1上包括第一取向控制层2，第二取向控制层4，软磁层6，非磁性层8，记录层12和碳保护层14 记录层12由显示铁磁性的FePt有序合金相和显示顺磁性的FePt 3有序合金相形成。 因此，作用于FePt有序合金相的磁耦合力被顺磁性FePt3有序合金相破坏。 FePt有序合金相的磁相互作用减小，噪声降低。 此外，可以进行高密度记录，并且由于具有高结晶磁各向异性的FePt有序合金用于记录层12，介质的热稳定性优异。

    Magnetic recording medium and magnetic recording apparatus
    2.
    发明授权
    Magnetic recording medium and magnetic recording apparatus 失效
    磁记录介质和磁记录装置

    公开(公告)号：US06846583B2

    公开(公告)日：2005-01-25

    申请号：US10356465

    申请日：2003-02-03

    申请人： Nobuyuki Inaba ,  Tetsunori Kouda ,  Hideaki Yamanaka ,  Satoshi Matsunuma ,  Enji Fujita

    发明人： Nobuyuki Inaba ,  Tetsunori Kouda ,  Hideaki Yamanaka ,  Satoshi Matsunuma ,  Enji Fujita

    IPC分类号： H05K5/02 ,  G11B5/64 ,  G11B5/65 ,  G11B5/667 ,  G11B5/73 ,  G11B5/851 ,  H05K5/03 ,  H05K7/18 ,  H05K7/20 ,  G11B5/66 ,  B32B15/00 ,  G11B5/70 ,  H01J1/00

    CPC分类号： G11B5/667 ,  G11B5/65 ,  G11B5/656 ,  G11B5/7325 ,  G11B5/851 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854

    摘要： A magnetic recording medium comprises a magnetic recording layer 63 which is formed by using an ordered alloy containing B on a substrate 1 containing an amorphous component. A part of B in the ordered alloy is segregated in a grain boundary, and thus the magnetic interaction, which acts between magnetic grains, can be reduced. Accordingly, it is possible to form fine and minute magnetic domains in the magnetic recording layer 63, and it is possible to reduce the medium noise as well. The temperature, at which the substrate is heated during the film formation of the magnetic recording layer 63, can be suppressed to be low, because the ordering temperature for the ordered alloy containing B is lower than those of ordered alloys not containing B. Therefore, it is possible to use a substrate made of glass which is suitable for the mass production. The magnetic recording layer 63 is also excellent in thermal stability because of the use of the ordered alloy having high magnetic anisotropy. According to the present invention, it is possible to provide the magnetic recording medium for high density recording which is excellent in thermal stability and which involves low medium noise.

    摘要翻译： 磁记录介质包括磁记录层63，磁记录层63通过在含有非晶成分的基板1上使用含有B的有序合金而形成。 有序合金中的B的一部分在晶界中分离，因此可以减小在磁性颗粒之间作用的磁相互作用。 因此，可以在磁记录层63中形成精细和微小的磁畴，并且也可以降低介质噪声。 由于含有B的有序合金的有序温度低于不含B的有序合金的排序温度，所以在磁记录层63的成膜期间加热基板的温度可以被抑制得较低。因此， 可以使用适合于批量生产的玻璃制的基板。 由于使用具有高磁各向异性的有序合金，磁记录层63的热稳定性也优异。 根据本发明，可以提供热稳定性优异且介质噪音低的高密度记录用磁记录介质。

    Read/write head and magnetic recording device
    6.
    发明授权
    Read/write head and magnetic recording device 失效
    读/写磁头和磁记录装置

    公开(公告)号：US06674594B1

    公开(公告)日：2004-01-06

    申请号：US10031338

    申请日：2002-01-25

    申请人： Kouichirou Wakabayashi ,  Teruaki Takeuchi ,  Nobuyuki Inaba

    发明人： Kouichirou Wakabayashi ,  Teruaki Takeuchi ,  Nobuyuki Inaba

    IPC分类号： G11B502

    CPC分类号： G11B5/127 ,  G11B5/00 ,  G11B5/012 ,  G11B5/3103 ,  G11B5/3967 ,  G11B5/4886 ,  G11B5/596 ,  G11B5/59627 ,  G11B5/59655 ,  G11B5/59683 ,  G11B13/045 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0021

    摘要： A magnetic recording apparatus includes a laser light source (132), a recording magnetic head (131) and a magnetoresistive element. The recording magnetic head includes a pair of magnetic poles (100 and 101), between which the magnetoresistive element is interposed. A rotary actuator (Sa) positions the recording magnetic head at a desired track of a magnetic recording medium. A laser beam can be radiated onto the magnetic recording medium to raise the temperature of a region (302) of the medium. This region has a width of the order of the track width. The raised temperature lowers the coercive force of this region, where a recording magnetic field can be applied for high density recording. The rotary actuator may form a yaw angle (&thgr;) with a track of the magnetic recording medium. Even in this case, the recording magnetic head (131) and the reproducing element have no tracking offset from the code track. In addition, if the size of the magnetic poles (100 and 101) of the recording magnetic head are set within a predetermined range, the region (302) heated by the laser beam does not deviate from a recording magnetic field application region (303).

    摘要翻译： 磁记录装置包括激光源（132），记录磁头（131）和磁阻元件。 记录磁头包括一对磁极（100和101），磁阻元件插在其间。 旋转致动器（Sa）将记录磁头定位在磁记录介质的期望轨道处。 可以将激光束照射到磁记录介质上以升高介质的区域（302）的温度。 该区域具有轨道宽度顺序的宽度。 升高的温度降低了该区域的矫顽力，其中可以应用记录磁场用于高密度记录。 旋转致动器可以与磁记录介质的轨道形成偏航角（θ）。 即使在这种情况下，记录磁头（131）和再现元件也没有跟踪轨迹的跟踪偏移。 此外，如果将记录磁头的磁极（100和101）的尺寸设定在预定范围内，则由激光束加热的区域（302）不会偏离记录磁场施加区域（303） 。

    Magnetic recording disk, method of the magnetic recording disk and magnetic recording apparatus
    7.
    发明授权
    Magnetic recording disk, method of the magnetic recording disk and magnetic recording apparatus 失效
    磁记录盘，磁记录盘的方法和磁记录装置

    公开(公告)号：US06410133B1

    公开(公告)日：2002-06-25

    申请号：US09478377

    申请日：2000-01-06

    申请人： Fumiyoshi Kirino ,  Nobuyuki Inaba ,  Ken Takahashi ,  Takashi Naitou ,  Sumio Hosaka ,  Eiji Koyama ,  Motoyasu Terao ,  Hiroki Yamamoto ,  Hiroki Kuramoto

    发明人： Fumiyoshi Kirino ,  Nobuyuki Inaba ,  Ken Takahashi ,  Takashi Naitou ,  Sumio Hosaka ,  Eiji Koyama ,  Motoyasu Terao ,  Hiroki Yamamoto ,  Hiroki Kuramoto

    IPC分类号： G11B566

    CPC分类号： G11B5/7325 ,  G11B5/012 ,  G11B5/02 ,  G11B5/656 ,  G11B2005/0002 ,  Y10S428/90 ,  Y10T428/265

    摘要： A magnetic recording medium includes a non-magnetic substrate, an inorganic compound layer that is formed on the substrate and which contains a crystalline first oxide and a second oxide, and a magnetic layer that is formed on the inorganic compound layer. The crystalline first oxide comprises at least one oxide selected from cobalt oxide, chromium oxide, iron oxide and nickel oxide. The second oxide comprises at least one oxide selected from silicon oxide, aluminum oxide, titanium oxide, tantalum oxide and zinc oxide. The second oxide is present at a grain boundary of crystal grains of said first oxide. According to the present invention, magnetic recording media low in noise and diminished in thermal fluctuation and thermal decay can be obtained by making fine the crystal grains of a magnetic layer and controlling the dispersion of the grain size. Thus, magnetic recording apparatuses can be realized which can perform an ultrahigh density magnetic recording of higher than 20 Gb/in2.

    摘要翻译： 磁记录介质包括非磁性基板，形成在基板上并含有结晶的第一氧化物和第二氧化物的无机化合物层和形成在无机化合物层上的磁性层。 结晶第一氧化物包括选自氧化钴，氧化铬，氧化铁和氧化镍中的至少一种氧化物。 第二氧化物包括选自氧化硅，氧化铝，氧化钛，氧化钽和氧化锌中的至少一种氧化物。 第二氧化物存在于所述第一氧化物的晶粒的晶界处。 根据本发明，通过使磁性层的晶粒细化并控制晶粒尺寸的分散，可以获得低噪声和热波动和热衰减减小的磁记录介质。 因此，可以实现能够执行高于20Gb / in2的超高密度磁记录的磁记录装置。

    Magnetic head
    8.
    发明授权
    Magnetic head 失效
    磁头

    公开(公告)号：US06339330B1

    公开(公告)日：2002-01-15

    申请号：US09660241

    申请日：2000-09-12

    申请人： Toshihiko Sato ,  Ryoichi Nakatani ,  Nobuyuki Inaba

    发明人： Toshihiko Sato ,  Ryoichi Nakatani ,  Nobuyuki Inaba

    IPC分类号： H01L4308

    CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G01R33/06 ,  G11C11/16 ,  H01F10/3227 ,  H01F10/3254 ,  H01L43/08 ,  Y10T428/1114

    摘要： A magnetic sensor is constructed to be capable of detecting the change of tunnel current due to co-tunneling effect at a high S/N ratio by using a tunneling magneto-resistive element having a first magnetic layer of a soft magnetic material formed on a flat substrate, first and second tunnel barrier layers formed on the first magnetic layer, magnetic particles of a ferromagnetic material provided between the first and second tunnel barrier layers, and a second magnetic layer of a soft magnetic material formed on the second tunnel barrier layer so as to create tunneling junctions.

    摘要翻译： 磁传感器被构造成能够通过使用具有形成在平面上的软磁材料的第一磁性层的隧道式磁阻元件来检测由于高S / N比下的共同隧道效应引起的隧道电流的变化 形成在第一磁性层上的衬底，第一和第二隧道势垒层，设置在第一和第二隧道势垒层之间的铁磁材料的磁性颗粒和形成在第二隧道势垒层上的软磁材料的第二磁性层， 创建隧道路口。