| 摘要 |
PURPOSE:To obtain a vertical magnetic recording medium having good reproducibility and remarkably improved running durability by subjecting a magnetic layer to a plasma treatment then providing a protective layer thereon. CONSTITUTION:A vertically magnetized film having the axis of easy magnetization in the direction perpendicular to the film plane, for example, Co-Cr film is formed by a so-called thin film forming system such as sputtering, vacuum deposition or ion plating on one or both faces of a nonmagnetic substrate. The surface of the formed magnetic layer is subjected to the plasma treatment, then the protective layer is provided thereon. The plasma treatment includes a glow discharge treatment by DC, AC or high frequency or reverse sputtering treatment by high frequency or DC. Carbon, SiO2, Co-O-Cr, Cr-O, etc., are used as the protective layer and the film thickness is 0.002-0.1mum, more particularly preferably 0.005-0.05mum.
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