Patent ID: 7375365
Filing Date: 2008-05-20
Classification: G11C,H01L

Abstract:
1. A multilevel phase-change memory, comprising: a first phase-change layer; a second phase-change layer; a first heating layer formed on a first surface of the first phase-change layer; a second heating layer formed between the first heating layer and the second phase-change layer; a first top electrode formed on a second surface of the first phase-change layer; a second top electrode formed on a second surface of the second phase-change layer opposite to the second heating layer; and a bottom electrode formed on a second surface of the first heating layer opposite to the second heating layer; wherein the bottom electrode, the first heating layer and the first phase-change layer constitute an electrical current path, the bottom electrode, the first heating layer, the second heating layer and the second phase-change layer constitute another electrical current path, and the resistances of the two electrical current path are different.