Effective pinning energy landscape perturbations for propagating magnetic domain walls.
The interaction between a magnetic domain wall and a pinning site is explored in a planar nanowire using micromagnetics to reveal perturbations of the pinning energetics for propagating domain walls. Numerical simulations in the high damping 'quasi-static' and low damping 'dynamic' regimes are compared and show clear differences in de-pinning fields, indicating that dynamical micromagnetic models, which incorporate precessionally limited magnetization processes, are needed to understand domain wall pinning. Differences in the micromagnetic domain wall structure strongly influence the pinning and show periodic behaviour with increasing applied field associated with Walker breakdown. In the propagating regime pinning is complicated.
Department of Physics, Imperial College London, London SW7 2BZ, United Kingdom.
D M
DM
Burn
Department of Physics, Durham University, Durham DH1 3LE, United Kingdom.
D
D
Atkinson
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23971606
Science. 2005 Sep 9;309(5741):1688-92
16151002
Science. 2008 Apr 11;320(5873):190-4
18403702
J Magn Magn Mater. 2008;320(18):2279-2283
20463913
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19113374
Nano Lett. 2010 Jun 9;10(6):2220-4
20450169
Adv Mater. 2010 Jun 25;22(24):2706-10
20586046
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23971607
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25768777
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23978905
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26304797