Patent number: 4866672
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.
Type:
Grant
Filed:
November 14, 1988
Date of Patent:
September 12, 1989
Assignee:
Hitachi, Ltd.
Inventors:
Motoyasu Terao, Tetsuya Nishida, Yasushi Miyauchi, Shinkichi Horigome
Patent number: 4668573
Abstract: A thin film for recording data which is formed on a substrate directly or via a protection layer, and which develops change in the arrangement of atoms upon irradiation with a recording beam, wherein an average composition in the direction of film thickness is represented by the general formula,A.sub.X B.sub.Y C.sub.Z D.sub..alpha. E.sub..beta.wherein X, Y, Z, .alpha. and .beta. are values that lie over the ranges of 0.ltoreq.X<30, 0.ltoreq.Y.ltoreq.40, 0.ltoreq.Z.ltoreq.70, 15.ltoreq.Y+Z.ltoreq.70, 10.ltoreq..alpha..ltoreq.65, 20.ltoreq..beta..ltoreq.70, E denotes at least one element between Se and S, D denotes at least one element among As, Sb, Si and Ge, C denotes at least one element among Bi, Sn and Pb, B denotes at least one element among Cu, Ag, Au, Sc, Y, Ti, Zr, V, Nb, Cr, Mo, Mn, Fe, Ru, Co, Rh, Ni and Pd, and A denotes an element or elements other than those elements denoted by E, D, C and B.
Type:
Grant
Filed:
January 16, 1986
Date of Patent:
May 26, 1987
Assignee:
Hitachi, Ltd.
Inventors:
Motoyasu Terao, Tetsuya Nishida, Yasuhiro Ohta, Shinkichi Horigome, Yasushi Miyauchi