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The possibility of quantum oscillations of the tunnel conductance andmagnetoresistance induced by spin-wave excitations in aferromagnet-ferromagnet-ferromagnet double barrier tunnel junction, when themagnetizations of the two side ferromagnets are aligned antiparallel to that ofthe middle ferromagnet, is investigated in a self-consistent manner by means ofKeldysh nonequilibrium Green function method. It has been found that owing tothe s-d exchange interactions between conduction electrons and the spin densityinduced by spin accumulation in the middle ferromagnet, the differentialconductance and the TMR indeed oscillate with the increase of bias voltage,being consistent with the phenomenon that is observed recently in experiments.The effects of magnon modes, the energy levels of electrons as well as themolecular field in the central ferromagnet on the oscillatory transportproperty of the system are also discussed.

physical review. b, condensed matter and materials physics

Quantum Oscillations of Tunnel Magnetoresistance Induced by Spin-Wave  Excitations in Ferromagnet-Ferromagnet-Ferromagnet Double Barrier Tunnel  Junctions