Patent ID: 8279663

Claim:
A magnetoresistance effect element comprising: a first ferromagnetic layer having invariable magnetization perpendicular to a film plane; a second ferromagnetic layer having variable magnetization perpendicular to the film plane; a first nonmagnetic layer interposed between the first ferromagnetic layer and the second ferromagnetic layer; a third ferromagnetic layer provided on an opposite side of one of the first and second ferromagnetic layers from the first nonmagnetic layer, and having variable magnetization parallel to the film plane; and a second nonmagnetic layer interposed between the third ferromagnetic layer and the one of the first and second ferromagnetic layers, and spin-polarized electrons being injected into the second ferromagnetic layer by flowing a current in the direction perpendicular to the film planes between the third ferromagnetic layer and the other of the first and second ferromagnetic layers, precession movement being induced in the magnetization of the third ferromagnetic layer by injecting the spin-polarized electrons into the third ferromagnetic layer from the one of the first and second ferromagnetic layers through the second nonmagnetic layer, a rotating magnetic field of a frequency corresponding to the precession movement being applied to the second ferromagnetic layer.