AMORPHOUS OR QUASI-AMORPHOUS FILM STRUCTURE FOR OPTICAL OR MAGNETO-OPTICAL DATA MEMORY MEDIUM, OPTICAL DATA MEMORY DEVICE AND ITS PRODUCTION

摘要

PURPOSE: To obtain an excellent optical data memory device by preventing the generation of the noise occurring in the crystal grain boundaries within a ZrO2 layer for the signal by a laser beam transmitting the layer as the layer is amorphous, etc. CONSTITUTION: A disk 100 has a glass substrate 101, a dielectric layer 102, a magneto-optical allay layer 104, a dielectric substance layer 106 and a metallic layer 108. The alloy layer 104 consists of a TbFe alloy contg., for example, 26% Tb and 74% Fe. The layers 102 and 106 contain 5wt.% Y2 O3 , 10wt.% Al2 O3 and the balance ZrO2 . Al2 O3 is incorporated into the layers 102 and 106, by which the resistance force to corrosion is improved. Since the layers 102 and 106 are amorphous, the projected laser beam is not scattered by the coarse boundary face or crystal boundary face formed according to the state of crystalline ZrO2 between the ZrO2 and the adjacent layers and the noise by double refraction is prevented.