Current driven defect unbinding transition in an XY ferromagnet
arXiv:1104.1345 · doi:10.1103/PhysRevB.84.054458
Abstract
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.
13 pages. Minor changes, to appear in PRB
References in corpus (13)
- Spin Transfer Torques in MnSi at Ultra-low Current Densities
- Quantum phase transition in a far from equilibrium steady state of XY spin chain
- Nonequilibrium quantum criticality in open electronic systems
- Quantum critical states and phase transitions in the presence of non equilibrium noise
- Functional Keldysh Theory of Spin Torques
- Current driven quantum criticality in itinerant electron ferromagnets
- Quantum Criticality out of Equilibrium: Steady State in a Magnetic Single-Electron Transistor
- Effective temperature and Gilbert damping of a current-driven localized spin
- Driven quantum coarsening
- Current induced decoherence in the multichannel Kondo problem
- Nonequilibrium quantum criticality in bilayer itinerant ferromagnets
- Dissipative and nonequilibrium effects near a superconductor-metal quantum critical point
- Nonequilibrium magnetic and superconducting phases in the two-dimensional Hubbard model coupled to electrodes