Depinning of domain walls with an internal degree of freedom

V. Lecomte, S. E. Barnes, J. P. Eckmann, T. Giamarchi

Research output: Contribution to journalArticle

22 Scopus citations


Taking into account the coupling between the position of the wall and an internal degree of freedom, namely, its phase φ, we examine, in the rigid-wall approximation, the dynamics of a magnetic domain wall subject to a weak pinning potential. We determine the corresponding force-velocity characteristics, which display several unusual features when compared to the standard depinning behavior. At zero temperature, there exists a bistable regime for low forces, with a logarithmic behavior close to the transition. For weak pinning, there occurs a succession of bistable transitions corresponding to different topological modes of the phase evolution. At finite temperature, the force-velocity characteristics become nonmonotonous. We compare our results to recent experiments on permalloy nanowires.

Original languageEnglish (US)
Article number054413
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number5
StatePublished - Aug 21 2009

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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