Patent ID: 11889773
Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A phase change memory (PCM) cell comprising:
a first electrode comprised of a first electrically conductive material;
a second electrode comprised of a second electrically conductive material;
a first phase change layer positioned between the first electrode and the second electrode and being comprised of a first phase change material having a first resistivity;
a second phase change layer positioned between the first electrode and the second electrode and being comprised of a second phase change material having a second resistivity; and
a third phase change layer in contact with the first phase change layer and the second electrode, the third phase change layer comprised of a third phase change material having a third resistivity;
wherein the first resistivity is at least two times the second resistivity and is at least two times the third resistivity.