Browsing by Author "Roy, P. E."
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Antivortex domain walls observed in permalloy rings via magnetic force microscopy
Roy, P. E.; Lee, J. H.; Trypiniotis, Theodossis; Anderson, D.; Jones, G. A. C.; Tse, D.; Barnes, C. H. W. (2009)Magnetic domain walls in patterned permalloy ring elements of different widths and thicknesses have been probed by magnetic force microscopy and micromagnetic simulations. We report the experimental observation of antivortex ...
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Article
Micromagnetic simulations of spin-wave normal modes and the resonant field-driven magnetization dynamics of a 360° domain wall in a soft magnetic stripe
Roy, P. E.; Trypiniotis, Theodossis; Barnes, C. H. W. (2010)Spin normal modes of a 360° domain wall trapped in a stripe are investigated by micromagnetic simulations, for two in-plane field excitation directions. Within the substructure of the 360° domain wall, we identify highly ...
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Article
Topological-charge-driven reversal of ferromagnetic rings via 360 â^~ domain-wall formation
Oyarce, A. L. G.; Trypiniotis, Theodossis; Roy, P. E.; Barnes, C. H. W. (2013)We study the reversal mechanism between opposite closed flux states of ferromagnetic nanorings driven by an azimuthal magnetic field. The reversal proceeds via the formation of 360â^~ domain walls, and we show that the ...