Perpendicular magnetic recording medium
AssigneeNEC Corporation
InventorsHirotaka Hokkyo, Shinzo Tsuboi, Katsumichi Tagami
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Abstract
In a perpendicular magnetic recording medium, a soft magnetic film playing the role of an back layer, but not having a domain wall structure, is positioned beneath a perpendicular magnetization film. Such a back layer improves the envelope characteristic of the medium at the time of recording and reproduction. Moreover, the medium is free from spike noise and the decrease or cancellation of recorded magnetization ascribable to the movement of the domain wall of a back layer. The medium of the present invention is therefore a drastic solution to the problems particular to a conventional perpendicular magnetic recording medium and realizes desirable recording and reproducing characteristics.
Claims17
A perpendicular magnetic recording medium comprising:
- a substrate;
- a soft magnetic film formed on said substrate;
- and
- a perpendicular magnetization film formed on said soft magnetic film;
- said soft magnetic film being formed of a material not having a domain wall structure and having a coercive force of less than 300 Oe inclusive.
Dependencies are inferred from the claim text.