Invention Application
- Patent Title: Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus
- Patent Title (中): 垂直磁记录介质和磁记录/再现装置
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Application No.: US10791277Application Date: 2004-03-03
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Publication No.: US20040219329A1Publication Date: 2004-11-04
- Inventor: Soichi Oikawa , Takeshi Iwasaki , Hiroshi Sakai , Akira Sakawaki , Kenji Shimizu
- Applicant: KABUSHIKI KAISHA TOSHIBA , SHOWA DENKO K.K.
- Applicant Address: JP Tokyo JP Tokyo
- Assignee: KABUSHIKI KAISHA TOSHIBA,SHOWA DENKO K.K.
- Current Assignee: KABUSHIKI KAISHA TOSHIBA,SHOWA DENKO K.K.
- Current Assignee Address: JP Tokyo JP Tokyo
- Priority: JP2003-097318 20030331
- Main IPC: B32B003/02
- IPC: B32B003/02
Abstract:
Disclosed is a perpendicular magnetic recording medium including a nonmagnetic substrate, a multilayered underlayer which includes a ferromagnetic underlayer having a perpendicular coercive force of 39.5 kA/m or less and a weakly magnetic underlayer having a saturation magnetization Ms of 50 to 150 emu/cc, and a perpendicular magnetic recording layer.
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