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Advances in Condensed Matter Physics
Volume 2012 (2012), Article ID 105253, 8 pages
http://dx.doi.org/10.1155/2012/105253
Research Article

On the Travelling Wave Solution for the Current-Driven Steady Domain Wall Motion in Magnetic Nanostrips under the Influence of Rashba Field

1Department of Matter Physics and Electronic Engineering, University of Messina, V.le F. Stagno D’Alcontres 31, 98166 Messina, Italy
2Department of Science for Engineering and Architecture, University of Messina, Contrada Di Dio, 98166 Messina, Italy

Received 31 March 2012; Revised 17 May 2012; Accepted 19 May 2012

Academic Editor: Roberto Zivieri

Copyright © 2012 Vito Puliafito and Giancarlo Consolo. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Spin-orbit Rashba effect applies a torque on the magnetization of a ferromagnetic nanostrip in the case of structural inversion asymmetry, also affecting the steady domain wall motion induced by a spin-polarized current. This influence is here analytically studied in the framework of the extended Landau-Lifshitz-Gilbert equation, including the Rashba effect as an additive term of the effective field. Results of previous micromagnetic simulations and experiments have shown that this field yields an increased value of the Walker breakdown current together with an enlargement of the domain wall width. In order to analytically describe these results, the standard travelling wave ansatz for the steady domain wall motion is here adopted. Results of our investigations reveal the impossibility to reproduce, at the same time, the previous features and suggest the need of a more sophisticated model whose development requires, in turn, additional information to be extracted from ad hoc micromagnetic simulations.