| 摘要 |
PURPOSE:To extremely improve lubricating performance by further providing a carbon film having a lower coefft. of friction on two-layered protective films consisting of a carbon film and carbide film. CONSTITUTION:An underlying film 2 is formed by Ni-P electroless plating to, for example, 20mum film thickness on a substrate 1 for a disk. This recording medium is made into, for example, the constitution consisting in adjusting the surface roughness of the substrate to 0.5-5nm Ra, forming a magnetic metallic film 3 consisting of Co-Ni or Co-Cr having chromium base thereon, and coating the metallic carbide film 4 consisting of chromium carbide, etc. thereon and further the carbon film (middle layer) 5 and carbon film (upper layer) 6 thereon. The carbon film having the lower coefft. of friction is further formed on the two-layered protective films consisting of the carbon film and the carbide film to form the protective films having 3-layered structure, then the lower layer of the protective films is the metallic carbide having high hardness and the surface exhibits the low coefft. of friction.
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