Current driven defect unbinding transition in an XY ferromagnet

Details Current driven defect unbinding transition in an XY ferromagnet Current driven defect unbinding transition in an XY ferromagnet

2011-04-07

arxiv.org/abs/1104.1345v2

Phys. Rev. B 84, 054458 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages. Minor changes, to appear in PRB

Scientific paper

A Keldysh-contour effective field theory is derived for magnetic vortices in the presence of current flow. The effect of adiabatic and non-adiabatic spin transfer torques on vortex motion is highlighted. Similarities to and differences from the superconducting case are presented and explained. Current flow across a magnetically ordered state is shown to lead to a defect-unbinding phase transition which is intrinsically nonequilibrium in the sense of not being driven by a variation in effective temperature. The dependence of the density of vortices on the current density is determined.

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