Authors
WK Hiebert, GE Ballentine, Liesbet Lagae, RW Hunt, MR Freeman
Publication date
2002/7/1
Journal
Journal of applied physics
Volume
92
Issue
1
Pages
392-396
Publisher
American Institute of Physics
Description
The magnetic switching dynamics of a thin-film microstructured Permalloy element were directly observed undergoing incoherent rotation reversal processes. Experimental spatiotemporally and vectorially resolved micromagnetic data show qualitative agreement with numerically simulated micromagnetic data for the nonequilibrium states during reversal. The application of a longitudinal reversal field launches rotations in both clockwise and counterclockwise directions, governed by magnetostatic effects, at different locations within a shaped sample. Reversal proceeds by fast initial selection into these rotation directions, immediately leading to vortex formation throughout the sample, and is followed by slower expulsion of the vortices in the transverse-to-field direction through local coherent rotation. Apparent transient damping, magnetization vector length averages, and spatial frequency representations support …
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