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US 6,607,849 B2Granted
Magnetic recording medium and magnetic recording apparatus using the same
AssigneeHitachi, Ltd.
InventorsMasaaki Futamoto, Nobuyuki Inaba, Yoshiyuki Hirayama, Yukio Honda, Kazuetsu Yoshida, Kenya Ito
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Abstract
Magnetic recording medium includes at least two layers having different magnetic anisotropy constants formed on a substrate and the perpendicular magnetic anisotropy of the second magnetic film of those magnetic films, far from the substrate surface, made equal to or larger than that of the first magnetic film near to the substrate surface, thus improving the magnetic isolation.
Claims2
A perpendicular recording medium comprising:
- a substrate,
- a perpendicular magnetization film,
- at least one first soft magnetization film formed between the substrate and the perpendicular magnetization film, and
- a second soft magnetization film formed on said perpendicular magnetization film, wherein a thickness of the second soft magnetization film is less than a thickness of the perpendicular magnetization film, and
- the thickness of the second soft magnetization film is within a range of 2 nm to 10 nm, and
- a total thickness of said second soft magnetization film and the perpendicular magnetization film is within a range of 7 nm to 100 nm.
3 more elements
Dependencies are inferred from the claim text.