Optical information recording medium and manufacturing method thereof and optical information recording medium recording layer

An optical information recording medium recording layer comprising:

• W oxide, Pd oxide, and Cu oxide as principal components,
• wherein a ratio of W, Pd, and Cu that are respectively included in the W oxide, the Pd oxide, and the Cu oxide satisfies a relationship 0.17≦x1 (where x1=a/(b+0.8c), where a:
• atomic ratio (atomic %) of W with respect to a total of W, Pd, and Cu, b:
• atomic ratio (atomic %) of Pd with respect to a total of W, Pd, and Cu, and c:
• atomic ratio (atomic %) of Cu with respect to a total of W, Pd, and Cu).

A manufacturing method of an optical information recording medium comprising:

• forming a metal oxide recording layer by reactive sputtering with at least oxygen using an optical information recording medium target,
• wherein the optical information recording medium target includes W, Pd, and Cu as principal components,
• and a ratio of W, Pd, and Cu satisfies a relationship 0.17≦x1 (where x1=a/(b+0.8c), where a:
• atomic ratio (atomic %) of W with respect to a total of W, Pd, and Cu, b:
• atomic ratio (atomic %) of Pd with respect to a total of W, Pd, and Cu, and c:
• atomic ratio (atomic %) of Cu with respect to a total of W, Pd, and Cu).