Patent ID: 8014193

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 the second ferromagnetic layer from the first nonmagnetic layer, and having variable magnetization parallel to the film plane; and a second nonmagnetic layer interposed between the second ferromagnetic layer and the third ferromagnetic layer, spin-polarized electrons being injected into the second ferromagnetic layer by flowing a current in the direction perpendicular to the film plane between the first ferromagnetic layer and the third ferromagnetic layer, 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 second ferromagnetic layer through the second nonmagnetic layer, a microwave magnetic field of a frequency corresponding to the precession movement being applied to the second ferromagnetic layer.