Dynamic magnetic information storage or retrieval – Record medium – Disk
Reexamination Certificate
2011-08-16
2011-08-16
Davis, David D (Department: 2627)
Dynamic magnetic information storage or retrieval
Record medium
Disk
Reexamination Certificate
active
08000060
ABSTRACT:
Embodiments of the present invention provide a perpendicular magnetic recording medium having a substrate, a magnetic recording layer and a protective layer. The magnetic recording layer includes a perpendicular recording layer, a magnetic coupling layer and a writing assist layer. The perpendicular recording layer is a Co alloy layer containing an oxide disposed between the magnetic coupling layer and the substrate. The magnetic coupling layer is a ferromagnetic layer disposed between the perpendicular recording layer and the writing assist layer. The writing assist layer is a ferromagnetic layer disposed between the magnetic coupling layer and the protective layer. The saturation magnetization of the magnetic coupling layer is lower than the saturation magnetization of the perpendicular recording layer or the writing assist layer. The thickness of the magnetic coupling layer is 1 nm or more and 3 nm or less.
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Takekuma Ikuko
Tanahashi Kiwamu
Zhang Zhengang
Davis David D
Hitachi Global Storage Technologies - Netherlands B.V.
Zilka-Kotab, PC
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