| 摘要 |
PURPOSE:To obtain a photomagnetic recording medium where an amorphous magnetic thin film alloy stable for a long term is adopted as a recording medium, excellent in environment-resistance, good in long-term stability and less secular change. CONSTITUTION:The thin film alloy of this invention is to improve a conventionally known photomagnetic recording medium. That is, it is possible to offer the photomagnetic recording medium less in secular change and excellent long- term storage by adding Cu (copper metal element) as an additive element. The ratio (RxT1-x) of R(Gd, Tb, Dy) to T(Co, Fe) is 0.1<=X<=0.4 known conventionally. The added Cu element of <=0.01mol gives almost no good result and when added by >=0.4mol, the deterioration in the magnetic characteristic Ms, Hc takes place, and the Kerr rotating angle is decreased, then it is impossible to use it as an optomagnetic recording medium because of deteriorated S/N and increase in the bit error rate. |
