| 摘要 |
PURPOSE:To permit vertical magnetization like a magnetic scale while having anisotropy in a thickness direction by specifying the components of a permanent magnet material to be used for a magnetic scale of a recording medium. CONSTITUTION:This recording medium is formed by using the permanent mag net material consisting of an Fe-Cr-Co alloy, more particularly, 24-30% Cr, 7-19% Co and the balance Fe, impurities and additive elements for a magnetic disk-shaped substrate 1. The substrate 1 is so treated as to have the magnetic anisotropy in the thickness direction Z-Z of the substrate. The substrate is so formed that said substrate can be magnetized like the magnetic scale 8 to be made when there is the magnetic anisotropy in the radial direction R-R in the stage of magnetizing the magnetic scale.
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