Invention Grant
- Patent Title: Magnetic recording medium, method for producing thereof, and magnetic recording and reproducing apparatus
- Patent Title (中): 磁记录介质，其制造方法以及磁记录和再现装置
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Application No.: US12274879Application Date: 2008-11-20
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Publication No.: US07867638B2Publication Date: 2011-01-11
- Inventor: Akira Sakawaki , Kenji Shimizu , Kazuo Kobayashi , Hiroshi Sakai , Soichi Oikawa , Takeshi Iwasaki , Tomoyuki Maeda , Futoshi Nakamura
- Applicant: Akira Sakawaki , Kenji Shimizu , Kazuo Kobayashi , Hiroshi Sakai , Soichi Oikawa , Takeshi Iwasaki , Tomoyuki Maeda , Futoshi Nakamura
- Applicant Address: JP Tokyo JP Tokyo
- Assignee: Showa Denko K.K.,Kabushiki Kaisha Toshiba
- Current Assignee: Showa Denko K.K.,Kabushiki Kaisha Toshiba
- Current Assignee Address: JP Tokyo JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2003-103454 20030407
- Main IPC: G11B5/66
- IPC: G11B5/66 ; G11B5/673 ; C23C16/40
Abstract:
A magnetic-recording medium which is provided on a nonmagnetic substrate with at least an orientation-controlling layer for controlling the orientation of a layer formed directly thereon, a perpendicularly magnetic layer having an easily magnetizing axis oriented mainly perpendicularly relative to the nonmagnetic substrate, and a protective layer. The perpendicularly magnetic layer includes two or more magnetic layers, at least one of the magnetic layers is a layer having Co as a main component and containing Pt as well and containing an oxide, and at least another of the magnetic layers is a layer having Co as a main component and containing Cr as well and containing no oxide.
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