PURPOSE: To provide a titled medium which has good perpendicular magnetic anisotropy, decreases the disturbance in the shape of recording pits, has a low noise level during reproducing and has an excellent erasing characteristic by forming said medium of a (Gd1-XRx)ZCo1-Z alloy film having the axis of easy magnetization in the direction perpendicular to the film plane and having a specific atomic compsn. ratio and coercive force.
CONSTITUTION: This medium is formed of the (Gd1-XRx)ZCo1-Z alloy film (R is a rare earth metal) which has the axis of easy magnetization in the direction perpendicular to the film plane and has the atomic compsn. ratio 0.3≤x≤0.9 and ≥4KOe coercive force at 20°C. The perpendicularly magnetized film suitable for magneto-optical recording is obtd. when x≥0.1, but the stability of the recording pits is poor is x is <0.3. The coercive force Hc is increased too much by the increase of the perpendicular magnetic anisotropy constant Ky and the decreased recording density is resulted if x>0.9. The noise level is low and constant if the coercive force at 20°C is ≥4KOe. The coercive force can be controlled by adjusting the content of Co, i.e., the value of z or adjusting the value of x or both said values.
TSUTSUMI KAZUHIKO
HAJIMA KAZUO
NOSE YUKARI
SUGAWARA HIROSHI
KUROKAWA HIROSHI
| JPS6148149A | 1986-03-08 |