Patent ID: 8530024

Claim:
A recording layer, comprising: an oxide of a metal X, wherein an absolute value of the standard free energy of oxide formation per 1 mol of oxygen is larger than an oxide of Pd and Ag, and the metal X is at least one selected from the group consisting of In, Sn, Zn, Bi, Ge, Co, W, Cu, and Al; a Pd oxide; and an Ag oxide, wherein, in the recording layer: a ratio of a Pd atom content to a total of a metal X atom content, the Pd atom content, and an Ag atom content is from 10 to 60 atomic %; a ratio of the Ag atom content to the total is from 5 to 45 atomic %; and a ratio of a total of the Pd atom content and the Ag atom content to the total is 75 atomic % or less.