Patent ID: 7459737

Claim:
A magnetic memory device comprising: at least one memory layer for holding information by a magnetization state of a magnetic material; first and second electrodes coupled to said at least one memory layer and configured to pass an electric current of a single polarity from the first electrode to the second electrode and through the at least one memory layer to change the magnetization state of the magnetic material both to a first state and to a second state; and a drive circuit to apply the electric current of the single polarity to the first electrode, the electric current being of the single polarity regardless of a desired magnetization state of the magnetic material; wherein said at least one memory layer is comprised of at least two magnetic layers and a nonmagnetic layer interposed between said two magnetic layers and wherein one magnetic layer of said two layers of magnetic layers has a large product of a damping constant of magnetization and a magnetization amount and magnetic anisotropy and has a small product of a magnetization amount and magnetic anisotropy as compared with those of the other magnetic layer.