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    Multi-layered magnetic recording medium and magnetic recording system employing the same
    1.
    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 containing heavy rare gas atoms, and a magnetic transducing system using the medium
    2.
    发明授权
    Magnetic recording medium containing heavy rare gas atoms, and a magnetic transducing system using the medium 失效
    含有重稀土气原子的磁记录介质，以及使用介质的磁转换系统

    公开(公告)号：US5650889A

    公开(公告)日：1997-07-22

    申请号：US380792

    申请日：1995-01-30

    申请人： Tomoo Yamamoto ,  Yuzuru Hosoe ,  Emi Mangyo ,  Masaaki Futamoto ,  Nobuyuki Inaba

    发明人： Tomoo Yamamoto ,  Yuzuru Hosoe ,  Emi Mangyo ,  Masaaki Futamoto ,  Nobuyuki Inaba

    IPC分类号： G11B5/012 ,  G11B5/64 ,  G11B5/82

    CPC分类号： G11B5/656 ,  G11B5/012

    摘要： A magnetic recording medium having a high coercivity and a high S/N ratio for high-density operation can include either a conductive or a nonconductive substrate. If the substrate is nonconductive, a conducting precoat layer is formed over the substrate. Further, an underlayer may be provided, over which a magnetic layer is formed by a bias sputtering method. The bias sputtering method may use Kr, Xe or Rn as a sputter gas, and employs a negative bias voltage. The magnetic recording medium has a product of remanent magnetization and magnetic layer thickness of 10-150 G.multidot..mu.m and a coercivity of 1600-4000 Oe. In combination with this magnetic recording medium, a large-capacity magnetic recording system has a write head that uses a magnetic material having a saturation magnetic flux density of more than 1.2 T in at least a part of the magnetic core; a read head utilizing the giant magnetoresistance effect; a signal processing circuit that utilizes maximum likelihood decoding; and circuits that correct for asymmetry of the reproduced signals from the magnetoresistive head. In addition, the flying height of the magnetic head slider is set to less than 0.05 .mu.m.

    摘要翻译： 具有高矫顽力和高S / N比的用于高密度操作的磁记录介质可以包括导电或非导电衬底。 如果衬底不导电，则在衬底上形成导电预涂层。 此外，可以设置底层，通过偏置溅射法在其上形成磁性层。 偏置溅射法可以使用Kr，Xe或Rn作为溅射气体，并采用负偏置电压。 磁记录介质具有10-150Gxμm的剩余磁化和磁性层厚度的产物，矫顽力为1600-4000Oe。 与该磁记录介质相结合，大容量磁记录系统具有在至少一部分磁芯中使用饱和磁通密度大于1.2T的磁性材料的写头; 利用巨磁电阻效应的读头; 利用最大似然解码的信号处理电路; 以及校正来自磁阻头的再现信号的不对称性的电路。 此外，磁头滑块的飞行高度设定为小于0.05μm。