Recording layer for optical information recording medium, optical information recording medium, and sputtering target

Abstract

Disclosed are: a recording layer for an optical information recording medium, which has excellent recording properties,an optical information recording medium equipped with the recording layer,and a sputtering target useful for the formation of the recording layer. Specifically disclosed is a recording layer for an optical information recording medium, on which the recording is achieved by means of the irradiation with a laser beam. The recording layer comprises an oxide of a metal X, a palladium oxide and a silver oxide, wherein the metal X is characterized in that an oxide thereof has a higher absolute value of a standard free energy of formation per 1 mol of oxygen than those of palladium and silver, the content ratios of palladium atoms and silver atoms relative to the sum total of the metal X atoms, palladium atoms and silver atoms in the recording layer are 10 to 60 at.% and 5 to 45 at.%, respectively, and the content ratio of the sum total of palladium atoms and silver atoms relative to the sum total of the metal X atoms, palladium atoms and silver atoms in the recording layer is 75 at.% or less.

Description

technical field [0001] The present invention relates to a recording layer for an optical information recording medium, an optical information recording medium, and a sputtering target useful for forming the recording layer. Background technique [0002] Optical information recording media (optical discs) are typified by optical discs such as CDs, DVDs, and BDs, and are broadly classified into three types, namely, playback-only types, write-once types, and rewritable types, according to recording and playback methods. Among them, the recording method of the write-once optical disc is mainly divided into a phase change method of causing a phase change in the recording layer, an interlayer reaction method of causing a plurality of recording layers to react, a method of decomposing a compound constituting the recording layer, and a local recording layer on the recording layer. A perforation method for forming recording marks such as holes and pits. [0003] In the phase change ...

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Problems solved by technology

In addition, it is difficult to obtain stable and further improved recording characteristics if only Pd or Ag oxides are formed as in Patent Document 9.

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