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Depinning of domain walls with an internal degree of freedom

Published in Physical Review. B, Condensed Matter. 2009, vol. 80, no. 5
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.
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LECOMTE, Vivien et al. Depinning of domain walls with an internal degree of freedom. In: Physical Review. B, Condensed Matter, 2009, vol. 80, n° 5. https://archive-ouverte.unige.ch/unige:36003

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Deposited on : 2014-04-28

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