Effects of disorder and internal dynamics on vortex wall propagation

Effects of disorder and internal dynamics on vortex wall propagation

Experimental measurements of domain wall propagation are typically interpreted by comparison to reduced models that ignore both the effects of disorder and the internal dynamics of the domain wall structure. Using micromagnetic simulations, we study vortex wall propagation in magnetic nanowires indu...

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Veröffentlicht in:Physical review letters 2010-05, Vol.104 (21), p.217201-217201, Article 217201
Hauptverfasser: Min, Hongki, McMichael, Robert D, Donahue, Michael J, Miltat, Jacques, Stiles, M D
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Condensed Matter
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container_title Physical review letters
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creator Min, Hongki
McMichael, Robert D
Donahue, Michael J
Miltat, Jacques
Stiles, M D
description Experimental measurements of domain wall propagation are typically interpreted by comparison to reduced models that ignore both the effects of disorder and the internal dynamics of the domain wall structure. Using micromagnetic simulations, we study vortex wall propagation in magnetic nanowires induced by fields or currents in the presence of disorder. We show that the disorder leads to increases and decreases in the domain wall velocity depending on the conditions. These results can be understood in terms of an effective damping that increases as disorder increases. As a domain wall moves through disorder, internal degrees of freedom get excited, increasing the energy dissipation rate.
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Physics
title Effects of disorder and internal dynamics on vortex wall propagation
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