Invention Application
- Patent Title: Perpendicular magnetic recording media and magnetic storage apparatus using the same
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Application No.: US12079701Application Date: 2008-03-27
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Publication No.: US20080182134A1Publication Date: 2008-07-31
- Inventor: Yoshiyuki Hirayama , Yuzuru Hosoe , Hiroyuki Nakagawa , Ikuko Takekuma
- Applicant: Yoshiyuki Hirayama , Yuzuru Hosoe , Hiroyuki Nakagawa , Ikuko Takekuma
- Applicant Address: NL Amsterdam
- Assignee: Hitachi Global Storage Technologies
- Current Assignee: Hitachi Global Storage Technologies
- Current Assignee Address: NL Amsterdam
- Priority: JP2003-427706 20031224
- Main IPC: G11B5/66
- IPC: G11B5/66

Abstract:
Embodiments of the invention provide a perpendicular magnetic recording medium that not only attains the magnetic isolation of crystal grains in a magnetic recording layer from one another in a region of the medium in which the thickness of an intermediate layer is equal to or smaller than about 20 nm but also exhibits excellent crystallographic texture and that exhibits small medium noise, excellent thermal stability, and high write-ability. In one embodiment, a perpendicular magnetic recording medium has at least a soft-magnetic underlayer, a first intermediate layer, a second intermediate layer, a third intermediate layer, and a magnetic recording layer successively formed on a substrate. The magnetic recording layer is composed of ferromagnetic crystal grains and oxides or nitrides, the third intermediate layer is composed of Ru or an Ru alloy, the second intermediate layer is composed of a metal or an alloy having the face-centered cubic lattice structure, and the first intermediate layer is composed of a metal or an alloy having the hexagonal close-packed structure.
Public/Granted literature
- US07618722B2 Perpendicular magnetic recording media and magnetic storage apparatus using the same Public/Granted day:2009-11-17
Information query
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