Patent ID: 7838953

Claim:
A magnetic memory cell comprising: a magnetoresistive element comprising a ferromagnetic free layer and a ferromagnetic pinned layer between which a nonmagnetic film is disposed; an upper electrode disposed in contact with an upper surface of the ferromagnetic free layer; and a lower electrode disposed under the ferromagnetic pinned layer, wherein A C >A E , where A C is the area of the upper surface of the ferromagnetic free layer and A E is the area of a connecting surface of the upper electrode that is in contact with the ferromagnetic free layer, and the barycentric coordinates in the upper surface of the ferromagnetic free layer are different from the barycentric coordinates in the connecting surface, wherein the magnetization of the ferromagnetic free layer is reversed by a spin-transfer torque produced by the flow of current through the magnetoresistive element when information is written.