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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 | Abstract: | Taking 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 | Services: | Forum | Review | PDF | Favorites |
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