Invention Grant
- Patent Title: Perpendicular magnetic recording medium and magnetic storage device
- Patent Title (中): 垂直磁记录介质和磁存储装置
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Application No.: US12362677Application Date: 2009-01-30
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Publication No.: US07862916B2Publication Date: 2011-01-04
- Inventor: Ryosaku Inamura
- Applicant: Ryosaku Inamura
- Applicant Address: JP Tokyo
- Assignee: Showa Denko K.K.
- Current Assignee: Showa Denko K.K.
- Current Assignee Address: JP Tokyo
- Agency: Staas & Halsey LLP
- Priority: JP2008-023113 20080201
- Main IPC: G11B5/66
- IPC: G11B5/66

Abstract:
The perpendicular magnetic recording medium includes a non-magnetic underlayer composed of Ru or an Ru alloy having a columnar structure in which crystalline particles are isolated from each other by a space, a non-magnetic granular layer provided on the non-magnetic underlayer and composed of crystalline particles and a non-soluble phase and a granular magnetic layer provided on the non-magnetic granular layer and composed of CoCrPt alloy crystalline particles and the non-soluble phase, wherein when a lattice constant in an in-plane direction of the non-magnetic underlayer is a1, the lattice constant in the in-plane direction of the non-magnetic granular layer is a2, and the lattice constant in the in-plane direction of the granular magnetic layer is a3, the relation a1>a2>a3 is satisfied.
Public/Granted literature
- US20090197122A1 PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE Public/Granted day:2009-08-06
Information query
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