| 摘要 |
PURPOSE:To obtain a photothermomagnetic recording medium which has well anticorrosive recording layers and excellent magnetic hysteresis characteristics, by forming photothermomagnetic recording layers on a substrate by sputtering in the presence of mixed gas of 100 pressure % gaseous Ar and 0.5-10 pressure % gaseous N2. CONSTITUTION:For the manufacture of a recording medium having information recorded on and reproduced from amorphous photothermomagnetic recording layers of MnBi, CrO2, GdTbFe, etc., by laser light, etc., when said alloy is formed on the substrate by sputtering, a vacuum device is evacuated to 10<-5> or below and then gaseous Ar is introduced to about 3X10<-2>Pa; and while 0.5-10 pressure % gaseous N2 based upon the gaseous Ar is introduced, said magnetic films are formed by sputtering. The gaseous N2 pressure is set as mentioned above to prevent corrosion of the magnetic films due to oxygen, water, etc., without deteriorating magnetic hysteresis characteristics, thus obtaining a long-life recording medium. |
