Magneto-optical recording medium anti-reflective layers made of amorphous thin films having a specific reflective index range

摘要

An optical magnetic disk is disclosed having an anti- reflective layer thereon for enhancing the Kerr rotation angle (&thgr;k) and the Faraday effect (&thgr;f), which comprises a first anti-reflection layer and a second anti-reflective layer coating of an amorphous material forming a thin film layer coating composed of As.sub.40 Se.sub.50-x S.sub. x Ge.sub. 10 on the upper and/or the lower surface of a recording layer, selectively, in which x is between 15 to 40, the reflective index (n) is in the range of 2.5 to 2.7, each of the thicknesses of the first and the second anti-reflective layers is between 600-660 Å and 250-350 Å, and the Kerr rotation angle (&thgr;k) of the amorphous thin film is 1.55. degree. at maximum.