Spin transfer torque in continuous textures: semiclassical Boltzmann approach

Details Spin transfer torque in continuous textures: semiclassical Boltzmann approach Spin transfer torque in continuous textures: semiclassical Boltzmann approach

2006-11-13

arxiv.org/abs/cond-mat/0611320v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Revised version accepted for publication, 12 pages, one figure

Scientific paper

10.1103/PhysRevB.75.174414

We consider a microscopic model of itinerant electrons coupled via ferromagnetic exchange to a local magnetization whose direction vector n(r,t) varies in space and time. We assume that to first order in the spatial gradient and time derivative of n(r,t) the magnetization distribution function f(p,r,t) of itinerant electrons has the Ansatz form: f(p,r,t)=f_{parallel}(p)n(r,t)+ f_{1 r}(p) n ^ nabla_{r} n+f_{2 r}(p) nabla_{r} n+ f_{1 t}(p) n ^ partial_t n+f_{2 t}(p) partial_t n. Using then the Landau-Sillin equations of motion approach we derive explicit forms for the components f_{parallel}(p), f_{1 r}(p), f_{2 r}(p), f_{1 t}(p) and f_{2 t}(p) in "equilibrum" and in out of equilibrum situations for: (i) no scattering by impurities, (ii) spin conserving scattering and (iii) spin non-conserving scattering. The back action on the localized electron magnetization from the out of equilibrum part of the two components f_{1 r}, f_{2 r} constitutes the two spin transfer torque terms.

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