| 摘要 |
PURPOSE:To improve the crystal orientation and magnetic characteristic of a magnetic layer and to increase the number of times of CSS by providing a nonmagnetic underlying layer consisting of one kind of B4C and BN between a nonmagnetic hardened layer and magnetic medium layer. CONSTITUTION:An alumite film is coated as the nonmagnetic hardened layer 2 to about 4mum on a disk-shaped aluminum alloy substrate 1. After the film is finished to a specular surface, the film consisting of one kind of B4C and BN is formed as the nonmagnetic underlying layer 3 thereon to the thickness ranging 50-2,400Angstrom and a thin gamma-Fe2O3 film is formed as the magnetic medium layer 4 thereon. The adverse effect of the nonmagnetic hardened layer 2 is prevented and the crystal orientation and magnetic characteristic of the magnetic layer are improved by providing the nonmagnetic underlying layer 3 consisting of, for example, the B4C film in the above-mentioned manner. The increase in the number of times of CSS is thus made possible.
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