Quantum spin pumping mediated by magnon

Details Quantum spin pumping mediated by magnon Quantum spin pumping mediated by magnon

2012-01-10

arxiv.org/abs/1201.1947v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

27 pages, 2 figures. v2; the detail of the calculation has been added in Appendix. The distinction from the spin pumping theor

Scientific paper

We theoretically propose quantum spin pumping mediated by magnons, under a time-dependent transverse magnetic field, at the interface between a ferromagnetic insulator and a non-magnetic metal. The generation of a spin current under a thermal equilibrium condition is discussed by calculating the spin transfer torque, which breaks the spin conservation law for conduction electrons and operates the coherent magnon state. Localized spins lose spin angular momentum by emitting magnons and conduction electrons flip from down to up by absorbing the momentum. The spin transfer torque has a resonance structure as a function of the angular frequency of the applied transverse field. This fact is useful to enhance the spin pumping effect induced by quantum fluctuations. We also discuss the distinction between our quantum spin pumping theory and the one proposed by Tserkovnyak et al.

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