| 摘要 |
PROBLEM TO BE SOLVED: To provide a perpendicular magnetic recording medium in which high recording density is obtained with low noise level from the medium. SOLUTION: The perpendicular magnetic recording medium is formed by successively laminating a base layer, CoCr alloy magnetic recording layer and carbon protective film on a substrate. Or in the perpendicular magnetic recording medium formed by successively laminating a base layer, soft magnetic layer, CoCr alloy magnetic recording layer and carbon protective film on the substrate, B is added to the base layer by the range of >=0.5 at.% to <=10 at.%.
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