Patent ID: 6699637
Filing Date: 2004-03-02
Classification: G11B,Y10S

Abstract:
A method for producing an optical information recording medium having a recording layer of materials whose main components comprise germanium (Ge), antimony (Sb) and tellurium (Te) on one side of a substrate comprising:forming on one side of the substrate a crystallization assisting layer in the form of a discontinuous island-like film of materials having a crystal structure of a face-centered cubic lattice system or of a tellurium (Te)-free material having a crystal structure of a rhombohedral lattice system, an absolute value of lattice unconformity between the crystal structure of the crystallization assisting layer and that of the recording layer being not more than 8%, the material of the crystallization assisting layer containing Bi (bismuth) and/or a bismuth (Bi) compound, the thickness of the crystallization assisting layer being from 3 to less than 30 Ã¥; and forming a recording layer by sputtering in a crystalline state without initial crystallization directly over the crystallization assisting layer.