发明申请
- 专利标题： Perpendicular magnetic recording medium, manufacturing method therefor, and magnetic read/write apparatus using the same
- 专利标题（中）： 垂直磁记录介质及其制造方法以及使用其的磁读/写装置
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申请号： US10574573申请日： 2004-10-05
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公开(公告)号： US20070065955A1公开(公告)日： 2007-03-22
- 发明人: Tomoyuki Maeda , Soichi Okawa , Takeshi Iwasaki , Futoshi Nakamura , Hiroshi Sakai , Kenji Shimizu , Akira Sakawaki
- 申请人： Tomoyuki Maeda , Soichi Okawa , Takeshi Iwasaki , Futoshi Nakamura , Hiroshi Sakai , Kenji Shimizu , Akira Sakawaki
- 申请人地址： JP Tokyo JP Tokyo
- 专利权人： KABUSHIKI KAISHA TOSHIBA,SHOWA DENKO K.K.
- 当前专利权人： KABUSHIKI KAISHA TOSHIBA,SHOWA DENKO K.K.
- 当前专利权人地址： JP Tokyo JP Tokyo
- 优先权： JP2003-347192 20031006
- 国际申请： PCT/JP04/15007 WO 20041005
- 主分类号： G11B5/82
- IPC分类号： G11B5/82 ; H01L21/00
摘要：
A perpendicular magnetic recording medium includes: a substrate; at least one underlayer formed above the substrate; and a perpendicular magnetic recording layer formed above the at least one underlayer, an easy magnetization axis of the perpendicular magnetic recording layer being oriented perpendicular to the substrate, the perpendicular magnetic recording layer including magnetic crystal particles and grain boundaries surrounding the magnetic crystal particles, wherein the grain boundaries contain an oxide of silicon and at least one element selected from the group consisting of Li, Na, K, Rb, Cs, Ca, Sr, and Ba, and the ratio of a total amount of substance of Si, Li, Na, K, Rb, Cs, Ca, Sr, and Ba in the perpendicular magnetic recording layer is no less than 1 mol % and no more than 20 mol %.