| 摘要 |
PURPOSE:To improve the running stability, durability, and dropout of a magnetic recording medium, by continuously forming a low-melting point nonmagnetic metal and magnetic metal by vapor phase plating on a nonmagnetic base body, on the surface of which fine particles are fitted under high-density conditions. CONSTITUTION:A nonmagnetic base body 4 is run by rotating a metallic can 3 in a vacuum chamber 2 and vapor-depositing sources 7 and 8 and a shutter 9 between the sources 7 and 8 are provided so as to oppose them to the running base body 4. Projections of 0.01-0.3mum in particle diameter are fitted to the surface of the base body 4 in density of 10,000-10,000,000 particles/mm.<2> and, when the base body 4 is run, the vapor-deposited film of a low-melting point nonmagnetic metal is formed on the base body 4 to thickness of 200lambda by means of the source 7 and the deposited film of a magnetic metal to thickness of 450lambda by means of the source 8. Therefore, the running stability and durability of the magnetic recording medium, on the surface of which projections of fine particle diameters larger than the thickness of the nonmagnetic metal film are formed, can be improved without lowering the coercive force and rectangular ratio. In addition to the above, the dropout of the magnetic recording medium can be reduced.
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