Patent ID: 8901531

Claim:
A magnetic memory device comprising: a memory layer having magnetization, the direction of magnetization of which changes according to information recorded therein; a reference layer having a fixed magnetization against which magnetization of the memory layer can be compared; a nonmagnetization layer between the memory layer and the reference layer; and an electrode on one side of the memory layer facing away from the reference layer, wherein, the memory device memorizes the information by reversal of the magnetization of the memory layer by a spin torque generated when a current flows between the memory layer, the nonmagnetization layer and the reference layer, a heat conductivity of a center portion of the electrode is lower than a heat conductivity of surroundings thereof, and the electrode substantially has a concave cross section, in which a thickness of a center portion thereof is thinner than that of the surroundings thereof, and a depressed portion at the center portion is filled with an insulator of low heat conductivity.