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29 March 2024
 
  » arxiv » 0903.0175

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Depinning of domain walls with an internal degree of freedom
Vivien Lecomte ; Stewart E. Barnes ; Jean-Pierre Eckmann ; Thierry Giamarchi ;
Date 1 Mar 2009
AbstractTaking into account the coupling between the position of the wall and an internal degree of freedom, namely its phase $phi$, 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 standard depinning laws. 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 non-monotonous. We compare our results to recent experiments on permalloy nanowires.
Source arXiv, 0903.0175
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