Magneto-optical recording medium and manufacturing method thereof.

摘要

According to a disk-shaped magneto-optical recording medium (10) of the invention, a transparent thin film (14) serving as an interference layer is formed on a transparent substrate (12). The thin film (14) is subjected to a plasma surface treatment, thereby decreasing the fused oxygen content in at least a surface portion thereof. A recording layer (16) of a rare-earth-transition metal amorphous ferrimagnetic alloy thin film is formed on the plasma surface-treated film (14). Since the content of active, fused oxygen contained in at least the surface portion of the film (14) decreases, rare-earth element oxide can hardly be formed in a boundary region (18) between the recording layer (16) and the transparent thin film (14). The content of the rare-earth element in this region (18) is smaller than the average content in the overall recording layer (16).