发明授权
US06835444B2 Magnetic recording medium using a perpendicular magnetic film having a tBr not exceeding one-fifth of a tBr of an in-plane magnetic film
失效
使用tBr不超过面内磁性膜的tBr的五分之一的垂直磁性膜的磁记录介质
- 专利标题： Magnetic recording medium using a perpendicular magnetic film having a tBr not exceeding one-fifth of a tBr of an in-plane magnetic film
- 专利标题（中）： 使用tBr不超过面内磁性膜的tBr的五分之一的垂直磁性膜的磁记录介质
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申请号： US09976767申请日： 2001-10-12
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公开(公告)号： US06835444B2公开(公告)日： 2004-12-28
- 发明人: Maki Maeda , Hiroto Takeshita , Takuya Uzumaki , Atsushi Tanaka
- 申请人： Maki Maeda , Hiroto Takeshita , Takuya Uzumaki , Atsushi Tanaka
- 优先权： JP2001-116020 20010413
- 主分类号： G11B566
- IPC分类号： G11B566
摘要：
A magnetic recording medium is provided. The magnetic recording medium comprises an in-plane magnetic film used for recording, and a perpendicular magnetic film formed on the in-plane magnetic film. The in-plane magnetic film has a magnetization easy axis in an in-plane direction. The perpendicular magnetic film has a magnetization easy axis oriented in a direction perpendicular to the magnetization easy axis of the in-plane magnetic film. A tBr (a product of a thickness and a residual magnetization) of the perpendicular magnetic film is set so as not to exceed one-fifth of a tBr of the in-plane magnetic film at the maximum.
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