Patent ID: 7037413
Filing Date: 2006-05-02
Classification: G11B,Y10S

Abstract:
1. A method of producing a phase change optical information recording medium comprising: a) forming a protective layer; b) forming a recording layer that generates a reversible phase-change, which can be optically detected according to an irradiation of an energy beam; c) forming a first barrier layer by sputtering using a target containing a barrier material in an atmosphere gas containing nitrogen; and d) forming a second barrier layer by sputtering using a target containing a barrier material in an atmosphere gas containing nitrogen; wherein said first barrier layer is formed between said protective layer and said recording layer, said protective layer comprises sulfur, said recording layer has a thickness less than or equal to 20 nm and comprises tellurium, said second barrier layer is formed at a side of said recording layer opposite to said first barrier layer; and wherein a nitrogen partial pressure in the atmosphere gas for forming said first barrier layer is higher than a nitrogen partial pressure in the atmosphere gas for forming said second barrier layer.