| 摘要 |
PURPOSE:To improve corrosion resistance and to extend life without deteriorating magnetic characteristics by adding a surface passive film forming metal element and noble metal element into a recording medium essentially consisting of a rare earth-ferrous group. CONSTITUTION:The element selected from Tb, Gd, Ho, and Dy is used as the rare earth Re of a thin amorphous rare earth-ferrous film which is the base body of the recording medium (Re-Fe-Co)1-xXx and Fe and Co are used as the ferrous element. The chemically stable passive film is formed by adding the metal element and noble metal element thereto in order to improve the corrosion resistance of the recording film itself. The element selected from V, Ta, Y, and Sn is used as the metal element and is added in a 0.01<=x<=0.15 compsn. range in order to prevent the deterioration in the magnetic characteristics. The metal selected from Au, Ag, Pd, and Pt is used as the noble metal X and is added in a 0.005<=x<=0.05 compsn. range in order to prevent the deterioration in the characteristics such as Kerr rotating angle and coercive force. The magnetic recording film 2 is thus formed by sputtering method on the cleaned glass or resin substrate 1.
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