公开(公告)号：US20030203239A1

公开(公告)日：2003-10-30

申请号：US10413481

申请日：2003-04-15

Applicant: Hitachi, Ltd.

Inventor： Tetsuya Kanbe ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Yoshio Takahashi ,  Kiwamu Tanahashi ,  Satoshi Matsunuma ,  Yoshihiro Shiroishi

IPC: B32B009/00

CPC classification number: G11B5/70 ,  G11B5/714 ,  Y10S428/90

Abstract: In a magnetic storage device, comprising a magnetic recording medium, a drive division that drives said magnetic recording medium in the record direction, a recording division and a regeneration division comprises magnetic head a means that the said magnetic head is put on in the relative motion for the said magnetic recording medium, a signal processing means for carrying out signal input to the said magnetic head and output signal regeneration from the said magnetic head, The said magnetic storage device uses a medium that has a following features; a magnetic layer in the said magnetic recording medium is formed on the substrate through monolayer or multiple underlayer, comprises said magnetic recording medium, the said magnetic layer has granular structure that the magnetic crystal grain is separated by the nonmagnetic phase, and the coercive force orientation ratio is bigger than 1. In the approximation that the said magnetic crystal grain is ellipsoid, the area ratio of the crystal grain of which the extended shaft direction is within 30null from circumferential direction is over 45% or c shaft length radialy measured swells over 1% compared to a shaft length circumferentially measured.

Abstract translation: 在磁存储装置中，包括磁记录介质，在记录方向上驱动所述磁记录介质的驱动分区，记录分区和再生分段，包括磁头a，使所述磁头相对运动 对于所述磁记录介质，信号处理装置用于对所述磁头执行信号输入并输出信号再生。所述磁存储装置使用具有以下特征的介质; 所述磁记录介质中的磁性层通过单层或多层下层形成在基板上，包括所述磁记录介质，所述磁性层具有磁结晶粒由非磁性相分离的颗粒结构，矫顽力取向 比率大于1.在近似所述磁晶粒为椭圆体的情况下，延伸轴方向与圆周方向相距在30°以内的晶粒的面积比超过45％或c轴长度的径向测量膨胀 相对于圆周测量的轴长度为1％。