Volume 111, Number 2, July 2015
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||18 August 2015|
Speed of field-driven domain walls in nanowires with large transverse magnetic anisotropy
Instituto de Física, Pontificia Universidad Católica de Chile - Casilla 306, Santiago 22, Chile
Received: 7 May 2015
Accepted: 20 July 2015
Recent analytical and numerical work on field-driven domain wall propagation in nanowires and thin films has shown that for large transverse anisotropy and sufficiently large applied fields the Walker profile becomes unstable before the breakdown field, giving way to a domain wall whose speed increases at a slower rate with the applied field. We perform an asymptotic expansion of the Landau-Lifshitz-Gilbert equation for large transverse magnetic anisotropy and show that the asymptotic dynamics reproduces this behavior. The appearance of a different regime in the asymptotic dynamics is due to a transition from a pushed to a pulled front of a reaction diffusion equation in which the speed of the domain wall increases with the square root of the applied field
PACS: 75.78.-n – Magnetization dynamics / 75.78.Fg – Dynamics of domain structures / 75.75.-c – Magnetic properties of nanostructures
© EPLA, 2015
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