Patent ID: 8687405

Claim:
A phase change memory, comprising: an insulating layer formed on a substrate; an electrode layer having one pole and an electrode layer having another pole, both electrode layers being formed within the insulating layer; an opening portion whose lower portion is on an upper portion of the insulating layer and having a substantially square or substantially rectangular shape; a phase change portion formed substantially parallel to a surface of the substrate along the respective sides of the lower portion of the opening portion; and two connection electrodes having one pole and respectively connected to the phase change portion at two corners of the lower portion of the opening portion opposite each other among four corners, and two connection electrode having another pole and respectively connected to the phase change portion at the other two corners opposite each other, wherein the connection electrode having one pole connects a diode portion connected to the electrode layer having one pole and the phase change portion, and the connection electrode having another pole connects the phase change portion and the electrode layer having another pole.