| 摘要 |
PROBLEM TO BE SOLVED: To provide a sputtering target suitable for the formation of an optical recording medium which is capable of high-density recording with the capacity equal to or higher than a DVD-ROM, which shows superior overwriting characteristics at a high recording line velocity and deterioration characteristics by reproducing light, and which shows sufficient reliability even when the medium is stored in a high temperature environment, and to provide an optical recording medium having high density and excellent characteristics for repeated recording and having the recording layer formed by using the above target. SOLUTION: The sputtering target for the formation of the recording layer of a phase change type optical recording medium contains Ag, Ge, Sb and Te as the main components expressed by the composition formula of AgaGebSbyTe(1-a-b-y) representing the atomic ratio of each component and satisfying 0.001<=a<=0.01, 0.01<=b<=0.05 and 0.40<=y<=0.90. The optical recording medium is formed by using the above sputtering target. |
