Current-Spin Coupling for Ferromagnetic Domain Walls in Fine Wires

S. E. Barnes and S. Maekawa
Phys. Rev. Lett. 95, 107204 – Published 2 September 2005

Abstract

The coupling between a current and a domain wall is examined. In the presence of a finite current and in the absence of a potential which breaks the translational symmetry, there is a perfect transfer of angular momentum from the conduction electrons to the wall. As a result, the ground state is in uniform motion and this remains the case even when relaxation is included. This is described by, appropriately modified, Landau-Lifshitz-Gilbert equations. The results for a simple pinning model are compared with experiment.

  • Figure
  • Received 1 October 2004

DOI:https://doi.org/10.1103/PhysRevLett.95.107204

©2005 American Physical Society

Authors & Affiliations

S. E. Barnes1,2 and S. Maekawa1

  • 1Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 2Physics Department, University of Miami, Coral Gables, Florida 33124, USA

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Issue

Vol. 95, Iss. 10 — 2 September 2005

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