| 摘要 |
PURPOSE:To improve corrosion resistance without spoiling magnetic characteristics by incorporating >=1 kinds of either Ru or Al into a magnetic film consisting of a specific amorphous are earth-transition metal alloy. CONSTITUTION:The amorphous alloy film of a photomagnetic recording medium having a substrate and the amorphous alloy film which is deposited on the substrate and has the axis of easy magnetization in the direction perpendicular to the film plane is the magnetic rare earth-transition metal alloy film which contains Ru and/or Al as the additive element and is expressed by the formula. Said film is constituted of 10-40at% rare earth metal, 60-70at% Fe, <=20at% Co nd the balance Ru and/or Al. R is selected from Tb, Gd and Dy and A is selected from Ru and/or Al, (x), (y), (z) are the values within a 0.10<=x<=0.40, 0<=y<=0.20 and 0.01<=z<=0.20 range. The spoiling of the magnetical and photomagnetical characteristics is thereby obviated and the improvement of the corrosion resistance is made possible.
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