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Title: Current-driven defect-unbinding transition in an XY ferromagnet

Abstract

A Keldysh-contour effective field theory is derived for magnetic vortices in the presence of current flow. The effect of adiabatic and nonadiabatic spin-transfer torques on vortex motion is highlighted. Similarities to and differences from the superconducting case are presented and are 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.

Authors:
 [1];  [2]
  1. Department of Physics, New York University, 4 Washington Place, New York, New York 10003 (United States)
  2. Department of Physics, Columbia University, 538 W. 120th Street, New York, New York 10027 (United States)
Publication Date:
OSTI Identifier:
21596837
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 84; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevB.84.054458; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CURRENT DENSITY; DEFECTS; DENSITY; FIELD THEORIES; MAGNETIC FLUX; PHASE TRANSFORMATIONS; SPIN; VORTICES; ANGULAR MOMENTUM; PARTICLE PROPERTIES; PHYSICAL PROPERTIES

Citation Formats

Mitra, Aditi, and Millis, Andrew J. Current-driven defect-unbinding transition in an XY ferromagnet. United States: N. p., 2011. Web. doi:10.1103/PHYSREVB.84.054458.
Mitra, Aditi, & Millis, Andrew J. Current-driven defect-unbinding transition in an XY ferromagnet. United States. doi:10.1103/PHYSREVB.84.054458.
Mitra, Aditi, and Millis, Andrew J. Mon . "Current-driven defect-unbinding transition in an XY ferromagnet". United States. doi:10.1103/PHYSREVB.84.054458.
@article{osti_21596837,
title = {Current-driven defect-unbinding transition in an XY ferromagnet},
author = {Mitra, Aditi and Millis, Andrew J.},
abstractNote = {A Keldysh-contour effective field theory is derived for magnetic vortices in the presence of current flow. The effect of adiabatic and nonadiabatic spin-transfer torques on vortex motion is highlighted. Similarities to and differences from the superconducting case are presented and are 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.},
doi = {10.1103/PHYSREVB.84.054458},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 5,
volume = 84,
place = {United States},
year = {2011},
month = {8}
}