Phys. Rev. B 79, 174401 (2009) [8 pages]Influence of interfacial magnons on spin transfer torque in magnetic tunnel junctionsReceived 4 December 2008; revised 6 April 2009; published 1 May 2009 The role of interfacial electron-magnon interaction in a noncollinear magnetic tunnel junction is investigated using the transfer Hamiltonian method. It is shown that the interfacial electron-magnon scattering modifies the bias dependence of both components of the spin-transfer torque. In particular, we find that at low temperature, the magnons emission adds a quadratic contribution and at finite temperature, both quadratic and linear terms appear. These contributions can explain recent experimental results on the bias dependence of spin-transfer torque. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.79.174401
DOI:
10.1103/PhysRevB.79.174401
PACS:
72.25.−b, 73.43.Jn, 73.40.Rw, 73.43.Qt
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