Invention Grant
- Patent Title: Perpendicular magnetic recording medium
- Patent Title (中): 垂直磁记录介质
-
Application No.: US10898348Application Date: 2004-07-26
-
Publication No.: US07993765B2Publication Date: 2011-08-09
- Inventor: Kong Kim , Kinobu Osakabe , Junichi Horikawa
- Applicant: Kong Kim , Kinobu Osakabe , Junichi Horikawa
- Applicant Address: SG Singapore
- Assignee: WD Media (Singapore) Pte. Ltd.
- Current Assignee: WD Media (Singapore) Pte. Ltd.
- Current Assignee Address: SG Singapore
- Priority: JP2003/279861 20030725
- Main IPC: G11B5/667
- IPC: G11B5/667 ; G11B5/66

Abstract:
In a perpendicular magnetic recording medium which includes a substrate (1) of a nonmagnetic material, first and second nonmagnetic underlayers (4 and 5) formed on the substrate, and a perpendicular magnetic recording layer (6) formed on the first and the second nonmagnetic underlayers, the first nonmagnetic underlayer is made of an amorphous nonmagnetic metal material containing a metal element which forms a face-centered cubic (fcc) crystal structure by a simple substance. The second nonmagnetic underlayer is formed on the first nonmagnetic underlayer in contact with the first nonmagnetic underlayer and made of a nonmagnetic material containing a hexagonal close packed structure. The perpendicular magnetic recording layer is formed on the second nonmagnetic underlayer in contact with the second nonmagnetic layer.
Public/Granted literature
- US20050019608A1 Perpendicular magnetic recording medium Public/Granted day:2005-01-27
Information query
IPC分类: