| 摘要 |
<p>This invention provides an optical disk comprising a Cu alloy recording layer and having a structure comprising a recording layer held between protective layers of ZnS-SiO<SUB>2</SUB>, characterized in that the recording layer comprises 1 to 20 at% in total of one or more components selected from Zn, Mn, Ga, Ti, and Ta with the balance consisting of Cu and unavoidable impurities, and a sputtering target for a Cu alloy recording layer. The optical disk and sputtering target for a Cu alloy recording layer, particularly when ZnS-SiO<SUB>2</SUB> is used as a protective layer, can prevent or suppress the sulfidization of the Cu recording layer caused by the diffusion of S from the protective layer to provide an optical recording medium free from recording bit errors.</p> |
