| 摘要 |
PURPOSE:To efficiently obtain a magnetic recording medium for high-density recording by the vertical vapor-deposition of an alloy by forming an amorphous continuous film of Si or an Si compound, a discontinuous islandlike bismuth layer and a magnetic thin film of a Co-Ni alloy having a specified composition on a nonmagnetic support in order. CONSTITUTION:A continuous film 2 of Si or an Si compound such as SiO2, Si3N4 or SiC is formed on the surface of a nonmagnetic support 1 in 50-500Angstrom thickness by vapor deposition or other method. A Bi layer 3 is formed on the film 2 in 10-1,000Angstrom thickness, and an Ni-Co alloy layer 4 contg. 30-50atomic% Ni is formed on the layer 3 in 250-500Angstrom thickness by vapor deposition in a high vacuum without requiring a diagonal vapor deposition method. The magnetic layer 4 is provided with sufficient coercive force and square ratio, and a magnetic recording medium suitable for high-density recording is obtd. with high productivity. Since the layers 2, 3 can be vapor-deposited at low boiling points, the magnetic layer can be formed even on a film support with relatively low heat resistance such as a polyester film without causing thermal deformation, etc. |
