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    Magnetic recording medium, method of fabricating magnetic recording medium, and magnetic storage
    1.
    发明授权
    Magnetic recording medium, method of fabricating magnetic recording medium, and magnetic storage 失效
    磁记录介质，制造磁记录介质的方法和磁存储

    公开(公告)号：US06692843B2

    公开(公告)日：2004-02-17

    申请号：US09784078

    申请日：2001-02-16

    申请人： Yoshibumi Matsuda ,  Akira Ishikawa ,  Yotsuo Yahisa ,  Yuzuru Hosoe ,  Tetsuya Kanbe ,  Koji Sakamoto

    发明人： Yoshibumi Matsuda ,  Akira Ishikawa ,  Yotsuo Yahisa ,  Yuzuru Hosoe ,  Tetsuya Kanbe ,  Koji Sakamoto

    IPC分类号： G11B573

    CPC分类号： G11B5/7325 ,  G11B5/8404 ,  Y10T428/1266 ,  Y10T428/12667

    摘要： A magnetic recording medium having first undercoating layers 40, 40′ formed directly or via substrate face undercoating layers on a substrate 40, second undercoating layers 42, 42′ directly formed on the first undercoating layers 40, 40′, magnetic films 43, 43′ formed on the second undercoating layers 42, 42′, and protective films 44, 44′ formed on the magnetic films 43, 43′. Clusters having a large amount of oxygen are dispersed on the boundary face of the first and second undercoating layers. Preferably, the first undercoating layer is made of an alloy which includes two kinds of elements in which the difference between oxide formation standard free energies &Dgr;G° of the elements at the temperature of 250° C. is large.

    摘要翻译： 一种磁记录介质，其具有直接形成在衬底40上的衬底表面底涂层形成的第一底涂层40,40'，直接形成在第一底涂层40,40'上的第二底涂层42,42'，磁性膜43,43' 形成在第二底涂层42,42'上，以及形成在磁性膜43,43'上的保护膜44,44'。 具有大量氧的簇分散在第一和第二底涂层的边界面上。 优选地，第一底涂层由包含两种元素的合金制成，其中在250℃的温度下元素的氧化物形成标准自由能的差ΔG°大。

    Magnetic recording medium, method of fabricating magnetic recording medium, and magnetic storage
    2.
    发明授权
    Magnetic recording medium, method of fabricating magnetic recording medium, and magnetic storage 失效
    磁记录介质，制造磁记录介质的方法和磁存储

    公开(公告)号：US06197367B1

    公开(公告)日：2001-03-06

    申请号：US08960751

    申请日：1997-10-29

    申请人： Yoshibumi Matsuda ,  Akira Ishikawa ,  Yotsuo Yahisa ,  Yuzuru Hosoe ,  Tetsuya Kanbe ,  Koji Sakamoto

    发明人： Yoshibumi Matsuda ,  Akira Ishikawa ,  Yotsuo Yahisa ,  Yuzuru Hosoe ,  Tetsuya Kanbe ,  Koji Sakamoto

    IPC分类号： G11B566

    CPC分类号： G11B5/7325 ,  G11B5/8404 ,  Y10T428/1266 ,  Y10T428/12667

    摘要： A magnetic recording medium having first undercoating layers 40, 40′ formed directly or via substrate face undercoating layers on a substrate 40, second undercoating layers 42, 42′ directly formed on the first undercoating layers 40, 40′, magnetic films 43, 43′ formed on the second undercoating layers 42, 42′, and protective films 44, 44′ formed on the magnetic films 43, 43′. Clusters having a large amount of oxygen are dispersed on the boundary face of the first and second undercoating layers. Preferably, the first undercoating layer is made of an alloy which includes two kinds of elements in which the difference between oxide formation standard free energies &Dgr;G° of the elements at the temperature of 250° C. is large.

    摘要翻译： 一种磁记录介质，其具有直接形成在衬底40上的衬底表面底涂层形成的第一底涂层40,40'，直接形成在第一底涂层40,40'上的第二底涂层42,42'，磁性膜43,43' 形成在第二底涂层42,42'上，以及形成在磁性膜43,43'上的保护膜44,44'。 具有大量氧的簇分散在第一和第二底涂层的边界面上。 优选地，第一底涂层由包含两种元素的合金制成，其中在250℃的温度下元素的氧化物形成标准自由能DELTAG°之间的差异大。

    Multi-layered magnetic recording medium and magnetic recording system employing the same
    8.
    发明授权
    Multi-layered magnetic recording medium and magnetic recording system employing the same 失效
    多层磁记录介质和采用该磁记录介质的磁记录系统

    公开(公告)号：US5723198A

    公开(公告)日：1998-03-03

    申请号：US258923

    申请日：1994-06-13

    申请人： Yuzuru Hosoe ,  Yoshihiro Shiroishi ,  Akira Ishikawa ,  Futoshi Tomiyama ,  Kazuetsu Yoshida ,  Tomoo Yamamoto ,  Yotsuo Yahisa ,  Akira Osaki ,  Katsuo Abe ,  Shinji Narishige ,  Naoki Kodama ,  Kiwamu Tanahashi ,  Emi Mangyo

    发明人： Yuzuru Hosoe ,  Yoshihiro Shiroishi ,  Akira Ishikawa ,  Futoshi Tomiyama ,  Kazuetsu Yoshida ,  Tomoo Yamamoto ,  Yotsuo Yahisa ,  Akira Osaki ,  Katsuo Abe ,  Shinji Narishige ,  Naoki Kodama ,  Kiwamu Tanahashi ,  Emi Mangyo

    IPC分类号： G11B5/66

    CPC分类号： G11B5/66 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/24942 ,  Y10T428/265

    摘要： In a magnetic recording system including magnetic recording media, a rotation driving unit for driving these magnetic recording media, read/write magnetic heads, driving apparatus for driving these read/write magnetic heads, and a read/write signal processing apparatus, a reading portion of the respective magnetic heads is arranged by a magnetoresistive head. The magnetic recording media are constructed of multi-layered magnetic media having a plurality of magnetic layers fabricated directly, or via underlayers on a non-magnetic disk substrate, and of non-magnetic intermediate layers arranged among these non-magnetic layers. Furthermore, one coercivity which is measured by applying a magnetic field along a circumferential direction of the magnetic recording media, is selected to be larger than the other coercivity which is measured by applying a magnetic field along a radial direction of the magnetic recording media, so that a higher signal-to-noise ratio is achieved, as compared with that of the conventional magnetic recording system. Since the thickness of the non-magnetic intermediate layers is smaller than or equal to 5 nm, and also the total layer is smaller than or equal to 5 nm, and also the total layer number of the plural magnetic layers is selected to be odd, better characteristics can be achieved. Accordingly, since the MTBF (Mean Time Before Failure) is longer than or equal to 0.15 million hours with high recording density, and the disk substrate and the magnetic head sliders can be mounted at high packaging density, a compact and high-capacity magnetic recording system can be obtained.

    摘要翻译： 在包括磁记录介质的磁记录系统中，用于驱动这些磁记录介质的旋转驱动单元，读/写磁头，用于驱动这些读/写磁头的驱动装置以及读/写信号处理装置，读/ 相应的磁头由磁阻头安排。 磁记录介质由具有直接制造的多个磁性层或通过非磁盘基板上的底层以及布置在这些非磁性层之间的非磁性中间层的多层磁性介质构成。 此外，通过沿着磁记录介质的圆周方向施加磁场来测量的一个矫顽力被选择为大于通过沿着磁记录介质的径向方向施加磁场而测量的其他矫顽力，因此， 与常规磁记录系统相比，实现了更高的信噪比。 由于非磁性中间层的厚度小于或等于5nm，并且总层小于或等于5nm，并且多个磁性层的总层数也被选择为奇数， 可以实现更好的特性。 因此，由于MTBF（平均故障间隔时间）长于或等于0.15万小时，具有高记录密度，并且盘基板和磁头滑块可以以高封装密度安装，紧凑且高容量的磁记录 系统可以得到。

    Magnetic recording medium, process for producing the same and magnetic recording system
    9.
    发明授权
    Magnetic recording medium, process for producing the same and magnetic recording system 失效
    磁记录介质，制造过程及磁记录系统

    公开(公告)号：US5815343A

    公开(公告)日：1998-09-29

    申请号：US967346

    申请日：1997-10-27

    申请人： Akira Ishikawa ,  Yoshihiro Shiroishi ,  Yuzuru Hosoe ,  Yotsuo Yahisa ,  Tomoo Yamamoto ,  Masukazu Igarashi ,  Akira Osaki ,  Yoshiki Kato ,  Jun Fumioka

    发明人： Akira Ishikawa ,  Yoshihiro Shiroishi ,  Yuzuru Hosoe ,  Yotsuo Yahisa ,  Tomoo Yamamoto ,  Masukazu Igarashi ,  Akira Osaki ,  Yoshiki Kato ,  Jun Fumioka

    IPC分类号： G11B5/012 ,  G11B5/39 ,  G11B5/62 ,  G11B5/64 ,  G11B5/66 ,  G11B5/73 ,  G11B5/84 ,  G11B5/78 ,  G11B5/82 ,  G11B17/00

    CPC分类号： G11B5/012 ,  G11B5/39 ,  G11B5/64 ,  G11B5/656 ,  G11B5/66 ,  G11B5/7315 ,  G11B5/7325 ,  G11B5/8404

    摘要： A magnetic recording medium includes a non-magnetic substrate, and a magnetic layer provided on the non-magnetic substrate. The value of the product Br.sub.1 .delta. of the residual flux density Br.sub.1 of the magnetic layer determined in a recording direction and the thickness .delta. of the magnetic layer is not less than 5 G.mu.m and not more than 180 G.mu.m; the value of the ratio of Br.sub.1 to the residual flux density Br.sub.2 determined in a direction parallel to the substrate plane and perpendicular to the recording direction, Br.sub.1 /Br.sub.2, is not less than 1.3 and not more than 3; the surface of the non-magnetic substrate has texture grooves therein extending predominantly in the recording direction; and the average roughness factor Ra of the surface of the magnetic layer determined in a direction perpendicular to the substrate plane and perpendicular to the recording direction is not less than 0.3 nm and not more than 1.9 nm. Alternatively, the value of the product Br.delta. of the residual flux density Br of the magnetic layer determined in the recording direction and the thickness .delta. of the magnetic layer is not less than 5 G.mu.m and not more than 80 G.mu.m; and the value of the anisotropic magnetic field H.sub.k of the magnetic recording medium is not less than 7 kOe and not more than 20 kOe.

    摘要翻译： 磁记录介质包括非磁性衬底和设置在非磁性衬底上的磁性层。 在记录方向上确定的磁性层的剩余磁通密度Br1和磁性层的厚度δ的乘积Br1δ的值不小于5Gm且不大于180Gm; 在平行于基板平面并垂直于记录方向Br1 / Br2的方向上确定的Br1与剩余通量密度Br2的比值不小于1.3且不大于3; 非磁性基板的表面具有主要在记录方向上延伸的织构槽; 并且在垂直于基板平面并垂直于记录方向的方向上确定的磁性层的表面的平均粗糙度Ra不小于0.3nm且不大于1.9nm。 或者，在记录方向上确定的磁性层的剩余磁通密度Br和磁性层的厚度δ的乘积Br delta的值不小于5Gm且不大于80Gm; 并且磁记录介质的各向异性磁场Hk的值不小于7kOe且不大于20kOe。