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    • 5. 发明授权
    • Magnetic disk drive
    • 磁盘驱动器
    • US06246544B1
    • 2001-06-12
    • US09196737
    • 1998-11-20
    • Katsumichi TagamiShinzo TsuboiKatsumi Suemitsu
    • Katsumichi TagamiShinzo TsuboiKatsumi Suemitsu
    • G11B566
    • G11B5/7315G11B5/59683G11B5/7325
    • A magnetic disk drive for recording and reproducing data out of a magnetic disk with a magnetoresisive (MR) head contacting the disk is disclosed. When the MR device is spaced from the surface of the medium by a recess of less than 15 nm inclusive, the surface of the medium is provided with a sheet resistance of less than 5 &OHgr;/cm2 inclusive. When the sheet resistance is greater than 5 &OHgr;/cm2, the recess is selected to be 16 nm or above. To enhance a frequency characteristic, the surface of the disk is provided with an undulation period of greater than 2 &mgr;m inclusive in the direction of movement of a head and a surface roughness of less than 1 nm inclusive. With this configuration, the disk drive obviates electrical faults ascribable to the sliding contact of the head and disk.
    • 公开了一种磁盘驱动器,用于利用与磁盘接触的磁感应(MR)磁头从磁盘中记录和再现数据。 当MR器件通过具有小于15nm的凹槽与介质的表面间隔开时,介质的表面具有小于5欧姆/平方厘米(含)的薄层电阻。 当薄层电阻大于5欧姆/平方厘米时,凹槽选择为16纳米或以上。 为了提高频率特性,在头部的移动方向和小于1nm的表面粗糙度的范围内,盘的表面设置有大于2um的波动周期(包括端面)。 通过这种配置,磁盘驱动器消除由于磁头和磁盘的滑动接触引起的电气故障。
    • 6. 发明授权
    • Perpendicular magnetic recording medium and manufacturing process therefor
    • 垂直磁记录介质及其制造工艺
    • US06387483B1
    • 2002-05-14
    • US09172911
    • 1998-10-15
    • Hirotaka HokkyoShinzo Tsuboi
    • Hirotaka HokkyoShinzo Tsuboi
    • G11B566
    • G11B5/667G11B5/66G11B5/851Y10S428/90Y10T428/26Y10T428/265
    • It is intended to reduce the media noise, and to improve the recording density dependence of read output voltage. The present invention provides a perpendicular magnetic recording media and its manufacturing process, wherein a perpendicular magnetic recording medium comprises a soft magnetic underlayer film and a perpendicular magnetizing film, these films being formed on a substrate in this order, a smoothness control film such as Cr film, being inserted between the substrate and the soft magnetic underlayer film. Therefore, perpendicular orientation and surface smoothness are improved for the perpendicular magnetizing film laminated on the smooth surface of the soft magnetic underlayer film. As the perpendicular orientation is improved for the perpendicular magnetizing film, the initial layer is reduced, thereby media noise being lowered and recording density dependence of read output voltage being improved. In addition, as the surface smoothness is improved for the perpendicular magnetizing film, sliding characteristics of a recording/reproducing head is also improved, thereby this also lowering the media noise.
    • 旨在降低介质噪声,并提高读取输出电压的记录密度依赖性。 本发明提供一种垂直磁记录介质及其制造方法,其中垂直磁记录介质包括软磁下层膜和垂直磁化膜,这些膜依次形成在基板上,平滑度控制膜如Cr 膜,插入在基板和软磁下层膜之间。 因此,对于层压在软磁下层膜的光滑表面上的垂直磁化膜,垂直取向和表面平滑度得到改善。 随着垂直磁化膜的垂直取向得到改善,初始层减小,从而介质噪声降低,读取输出电压的记录密度依赖性得到改善。 此外,随着垂直磁化膜的表面平滑度得到改善,记录/再现头的滑动特性也得到改善,从而也降低了介质噪声。