| 摘要 |
PURPOSE:To obtain a magnetic recording medium having superior durability by allowing a Cr-rich layer having a specified compsn. to exist in a magnetic layer within a specified depth range from the surface of the magnetic layer. CONSTITUTION:When a Cr-contg. magnetic recording layer 20 of Co-Cr, Co-Ni-Cr or the like is formed on a substrate 6 to obtain a magnetic recording medium, a Cr-rich layer 30 having 0.3-0.7 ratio of Cr to (Co+Cr) or (Co+Ni+Cr) is allowed to exist in the layer 20 within the depth range of 100Angstrom from the surface of the layer 20. In case of <0.3 ratio, the hardness of the layer 30 is low. In case of >0.7 ratio, the wear resistance is deteriorated. Thus, a surface layer having high hardness and superior wear resistance can be formed and the mechanical durability of the magnetic recording medium can be improved.
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