| 摘要 |
PURPOSE:To set the coercive force of a recording medium to the magnitude to be readily handled by forming the composition of a magnetooptical recording medium alloy of TbY(Fe1-XCOX)1-Y, where X and Y satisfy the prescribed conditions. CONSTITUTION:A white plate glass is used as a base, and thin plates of Tb, Co are placed on a disc of Fe as a target. After the base and the target are set, it is evacuated in vacuum, an Ar gas is introduced. Electric power is applied to the target from a high frequency power source to form a film. This film is formed of Fe-Tb-Co amorphous magnetic alloy, and when the composition of the alloy is represented by TbY(Fe1-XCoS)1-Y, X and Y satisfy any one of four conditions 0<X<=0.375 and 0.1<=Y<=0.16+4X/57.7, 0.375<X<1 and 0.1<=Y<=0.2-0.064(X- 0.375), 0<X<=0.3 and 0.2+X/3<=Y<=0.4, 0.3<X<1 and 0.3<=Y<=0.4. |
