Spin-torque generation by dc or ac voltages in magnetic layered structures

Details Spin-torque generation by dc or ac voltages in magnetic layered structures Spin-torque generation by dc or ac voltages in magnetic layered structures

2009-09-02

arxiv.org/abs/0909.0374v1

Phys. Rev. B 81, 045307 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.81.045307

A general expression of the current induced spin torque in a magnetic layered structure in the presence of external dc or ac voltages is derived in the framework of the scattering matrix approach. A detailed analysis is performed for a magnetic-nonmagnetic-magnetic trilayer connected to external leads in the presence of dc voltage bias in the ballistic regime. Alternatively, the possibility of producing spin torque by means of the adiabatic ac modulation of external gate voltages (quantum pumping) is proposed and discussed.

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