| 摘要 |
PURPOSE:To form a two-layered protective film having high bonding strength and causing no stripping on the thin magnetic metallic film of a thin film type magnetic recording medium by forming a thin nonmagnetic oxide film contg. the constituent atoms of the metallic film as constituent atoms on the metallic film and a thin carbon film on the oxide film. CONSTITUTION:The thin magnetic layer such as a vertically magnetizable Co-Cr film is formed on a substrate such as a polyester film. The layer of the oxide of the same metal or alloy as the metal or alloy of the magnetic layer is formed on the magnetic layer, and the thin carbon film is formed on the oxide layer by sputtering to form a two-layered protective film consisting of the oxide layer and the carbon film. Since the oxide layer contains the same metal as the metal of the magnetic layer, the bonding strength of the carbon film to the magnetic layer is increased, and a magnetic recording medium having superior durability and wear resistance is obtd. The wear of a magnetic head can be reduced.
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