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Abstract

An information-recording thin film provided on a substrate directly or through a protective layer has an average composition of the thin film being represented by the general formula; A.sub.X B.sub.Y C.sub.Z D.sub..alpha. E.sub..beta. F.sub..gamma. wherein X, Y, Z, .alpha., .beta. and .gamma. are in ranges of 0.ltoreq.X<30, 0.ltoreq.Y.ltoreq.60, 3.ltoreq.Z.ltoreq.70, 30.ltoreq..alpha..ltoreq.80, 0.ltoreq..beta.60 and 0.ltoreq..gamma..ltoreq.67 in atomic percentage, F is at least one element of As, Sb, Si and Ge; E is at least one element of Cu, Ag, Au, Sc, Y, Ti, Zr, V, Nb, Cr, Mo, Mn, Fe, Co, Rh, Ni, and Pd; D is at least one element of Se and S; C is at least one element of Sn, Pb, Bi, Zn, Cd, Ga and In; B is at least one element of Tl, halogen elements and alkali metal elements; and A is at least one of other elements than those represented by B, C, D, E and F, and records information through changes in the atomic configuration.

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First Claim