Patent ID: 7400522

Claim:
A resistance change memory device comprising: a semiconductor substrate; at least one cell array, in which memory cells are arranged, formed above the semiconductor substrate, each the memory cell having a stack structure of a variable resistance element and an access element, the variable resistance element storing a high resistance state or a low resistance state in a non-volatile manner, the access element having such an off-state resistance value in a certain voltage range that is ten times or more as high as that in a select state; and a read/write circuit formed on the semiconductor substrate as underlying the cell array for data reading and data writing in communication with the cell array, wherein the variable resistance element comprises a recording layer formed of a first composite compound expressed by A x M y O z (where “A” and “M” are cation elements different from each other; “O” oxygen; and 0.5≦x≦1.5, 0.5≦y≦2.5 and 1.5≦z≦4.5) and a second composite compound containing at least one transition element and a cavity site for housing a cation ion.