Magnetization reversal in a chain of Permalloy spheres, whose diameters of are large enough to support vortex structures, is investigated using micromagnetic modeling based on the Landau-Lifshitz-Gilbert equations. The emphasis is on a chain of two spheres with fields applied along and perpendicular to the axis of rotational symmetry. Magnetization processes and critical fields are given for (1) inversion symmetry, with opposite senses of vortex rotation in the two spheres, and (2) a more uniform curling mode, with the sense of rotation the same in both spheres. Symmetry breaking perturbations are shown to be important in the nucleation of changes from one magnetic configuration to the next. As the geometry is approximated by cubic grid cells, whose centers lie within the boundaries of the ideally smooth surfaces, the critical fields are influenced by the grid size. The results for two spheres are generalized in the description of a chain of spheres, in which at least symmetry states can be selected by the application of inhomogeneous fields.
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15 April 2006
Research Article|
Magnetism and Magnetic Materials|
April 24 2006
Evolution and propagation of magnetic vortices in chains of Permalloy nanospheres
P. Barpanda;
P. Barpanda
a)
Department of Materials Science and Engineering,
Rutgers University
, Piscataway, New Jersey 08854
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T. Kasama;
T. Kasama
Frontier Research System,
The Institute of Physical and Chemical Research
, Hatoyama, Saitama 350-0395, Japan and Department of Materials Science and Metallurgy, University of Cambridge
, Cambridge CB2 3QZ, United Kingdom
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R. E. Dunin-Borkowski;
R. E. Dunin-Borkowski
Department of Materials Science and Metallurgy,
University of Cambridge
, Cambridge CB2 3QZ, United Kingdom and Frontier Research System, The Institute of Physical and Chemical Research
, Hatoyama, Saitama 350-0395, Japan
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M. R. Scheinfein;
M. R. Scheinfein
Department of Physics,
Simon Fraser University
, Burnaby, British Columbia V5A 1S6, Canada
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A. S. Arrott
A. S. Arrott
Department of Physics,
Simon Fraser University
, Burnaby, British Columbia V5A IS6, Canada
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a)
Electronic mail: [email protected]
J. Appl. Phys. 99, 08G103 (2006)
Citation
P. Barpanda, T. Kasama, R. E. Dunin-Borkowski, M. R. Scheinfein, A. S. Arrott; Evolution and propagation of magnetic vortices in chains of Permalloy nanospheres. J. Appl. Phys. 15 April 2006; 99 (8): 08G103. https://doi.org/10.1063/1.2171957
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