| 摘要 |
PROBLEM TO BE SOLVED: To provide a perpendicular magnetic recording medium reducing medium noise and suitable for high density recording even when a medium substrate has a small diameter and is made a thin plate. SOLUTION: In the perpendicular magnetic recording medium wherein at least soft magnetic layers 30 and perpendicular magnetic recording layers are sequentially formed on the principal surface of a non-magnetic substrate 10, directions of magnetization easy axes of the soft magnetic layers 30 and 30 vertically sandwiching the substrate are parallel to a film surface, different by nearly 180°sandwiching the substrate and mutually magnetically coupled. Thereby, the perpendicular magnetic recording medium reducing medium noise and suitable for high recording density even when the medium substrate has the small diameter and is made the thin plate can be obtained with stable quality. COPYRIGHT: (C)2007,JPO&INPIT
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