发明申请
- 专利标题： Perpendicular Magnetic Recording Media, Production Process Thereof, and Perpendicular Magnetic Recording and Reproducing Apparatus
- 专利标题（中）： 垂直磁记录介质及其制造方法及垂直磁记录再生装置
-
申请号： US11795326申请日： 2006-01-31
-
公开(公告)号： US20080118781A1公开(公告)日： 2008-05-22
- 发明人: Migaku Takahashi , Masahiro Oka , Akira Kikitsu
- 申请人： Migaku Takahashi , Masahiro Oka , Akira Kikitsu
- 申请人地址： JP Sendai-shi JP Minato-ku, Tokyo JP Minato-ku, Tokyo
- 专利权人： Tohoku University,SHOWA DENKO K.K.,Kabushiki Kaisha Toshiba
- 当前专利权人： Tohoku University,SHOWA DENKO K.K.,Kabushiki Kaisha Toshiba
- 当前专利权人地址： JP Sendai-shi JP Minato-ku, Tokyo JP Minato-ku, Tokyo
- 优先权： JP2005-024946 20050201
- 国际申请： PCT/JP06/01929 WO 20060131
- 主分类号： G11B5/667
- IPC分类号： G11B5/667 ; G11B5/738 ; G11B5/82 ; G11B5/84 ; G11B5/852 ; H01F10/26
摘要：
Perpendicular magnetic recording media enabling high-density recording and reproduction of information, as well as a production process thereof, and a magnetic recording and reproducing apparatus, are provided. Perpendicular magnetic recording media, having at least a soft magnetic underlayer and perpendicular magnetic recording layer on a disc-shaped nonmagnetic substrate, in which the soft magnetic underlayer has at least two soft magnetic layers, and Ru or Re between the two soft magnetic layers, are provided; the easy axis of magnetization of the soft magnetic underlayer has a desired direction; the easy axis of magnetization of the soft magnetic underlayer is substantially distributed in a direction except a radial direction of the nonmagnetic substrate, and, the bias magnetic field of the antiferromagnetic coupling in the direction of the easy axis of magnetization of the soft magnetic underlayer is 10 Oersteds (790 A/m) or greater.