MAGNETO-OPTIC MEMORY MEDIUM

摘要

Magneto-optic memory media comprising a transparent substrate, a magneto-optic memory layer and a protective layer formed on at least one of the lower and upper sides of the magneto-optic memory layer which are superposed on the substrate. The protective layer is made of a covalently bonded material of at least three elements or components of silicon (Si), aluminium (Al), oxygen (O) and nitrogen (N). More particularly, the material is Si-Al-N, Si-Al-O, Si-Al-N, Si-O-N or Al-O-N. The medium may further comprises a reflective layer and/or a cover substrate for preventing mechanical breakage of the medium. The protective layer has a good corrosion resistance, can suppress a variation in coercive force and can enhance magneto-optic effects, enabling one to make reliable magneto-optic memory media of a high performance.