科研之友
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摘要
Analytical expressions for the spin-transfer torque (STT) in magnetic junctions with a ferromagnetic insulator (FI) are derived using the Keldysh formalism. Adopting simple approximations and ballistic transport, both parallel and perpendicular torques are expressed in terms of spin-dependent intersite Green's functions of the insulator. They depend linearly on the bias voltage because of the asymmetry of junctions. The relationship between STT and tunnel magnetoresistance, the difference between the features of the STT obtained in the present and previous works, and effects of the electronic structures of FI and those of impurities on the STT are discussed.
- 出版日期2011-11-3
