Invention Grant
- Patent Title: Perpendicular magnetic recording medium, method of producing the same, and magnetic storage device
- Patent Title (中): 垂直磁记录介质，其制造方法和磁存储装置
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Application No.: US11114894Application Date: 2005-04-26
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Publication No.: US07767322B2Publication Date: 2010-08-03
- Inventor: Ryoichi Mukai
- Applicant: Ryoichi Mukai
- Applicant Address: JP Tokyo
- Assignee: Showa Denko K.K.
- Current Assignee: Showa Denko K.K.
- Current Assignee Address: JP Tokyo
- Agency: Greer, Burns & Crain, Ltd.
- Priority: JP2004-144011 20040513; JP2005-062662 20050307
- Main IPC: G11B5/66
- IPC: G11B5/66
Abstract:
A perpendicular magnetic recording medium is disclosed that includes a recording layer having a columnar granular structure possessing an appropriate diameter distribution and uniform arrangement of magnetic particles. The perpendicular magnetic recording medium includes a substrate, and a soft-magnetic underlayer, a seed layer, an underlayer, a recording layer, a protection film, and a lubrication layer stacked on the substrate in order. The underlayer includes granular crystals formed from Ru or a Ru alloy and interstices separating the granular crystals from each other so as to isolate individual granular crystals. A continuing film formed from Ru or Ru alloys may be provided below the underlayer.
Public/Granted literature
- US20050255337A1 Perpendicular magnetic recording medium, method of producing the same, and magnetic storage device Public/Granted day:2005-11-17
Information query
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