Depinning of domain walls with an internal degree of freedom

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

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Abstract

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
Volume80
Issue number5
DOIs
StatePublished - Aug 21 2009

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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