| 摘要 |
PURPOSE:To obtain the titled high-density and high-reliability recording medium with less aged deterioration by forming a metallic magnetic film layer and then oxidizing the magnetic film layer. CONSTITUTION:A metallic magnetic thin film layer is formed and then the magnetic film layer is oxidized. For example, a nonmagnetic NiP substrate layer is chemically formed on an aluminum or an aluminum-base alloy substrate by using a plating bath using sodium hypophosphite as a reducing agent. Then a CoNi-Pt alloy thin film is formed in a pure gaseous Ar atmosphere on the substrate layer by sputtering, etc., and then a C protective film is immediately formed by sputtering. Subsequently, the magnetic film layer is heated in the atmosphere at 120 deg.C for 1hr and oxidized.
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