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Transversal walls versus vortex walls in magnetic nanowires
Author(s) -
Kühn Katharina
Publication year - 2006
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200610227
Subject(s) - vortex , nanowire , radius , scaling , physics , condensed matter physics , micromagnetics , magnetic field , classical mechanics , mathematics , geometry , mechanics , quantum mechanics , magnetization , computer security , computer science
In numeric simulations of magnetic nanowires several groups have observed two different types of reversal modes. It is suggested that the reversal mode corresponds to an energetically optimal domain wall profile. We investigate the energy minimisation problem in different regimes of thickness. When the radius goes to zero, the energy minimisation problem Γ‐converges to a reduced local one dimensional problem. Thus for small radii, minimisers of the energy functional are almost constant on the cross section. This is not the case for big radii. For radius to infinity, a class of magnetisations with a vortex has the optimal energy scaling. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)