The distribution of states upon the removal of applied magnetic field in an array of 7.5 X 7.5 mu m(2) permalloy square elements, as observed by transmission electron microscopy in Lorentz mode, shows a predominance of two states: the vortex state and the seven-domain state. The distributional dependence of these two states on the rate of change of the reversal field is established. Micromagnetic simulations suggest that vortex nucleation and the subsequent domain-wall propagation are the two primary mechanisms for magnetization reversal. The kinetics of the two pathways is examined in a manner that conforms to the observed distribution of states. (c) 2005 American Institute of Physics.
Direct correlation of reversal rate dynamics to domain configurations in micron-sized permalloy elements / Lau, Jw; Beleggia, M; Schofield, Ma; Neumark, Gf; Zhu, Y. - In: JOURNAL OF APPLIED PHYSICS. - ISSN 0021-8979. - 97:10(2005). [10.1063/1.1851731]
Direct correlation of reversal rate dynamics to domain configurations in micron-sized permalloy elements
Beleggia M;
2005
Abstract
The distribution of states upon the removal of applied magnetic field in an array of 7.5 X 7.5 mu m(2) permalloy square elements, as observed by transmission electron microscopy in Lorentz mode, shows a predominance of two states: the vortex state and the seven-domain state. The distributional dependence of these two states on the rate of change of the reversal field is established. Micromagnetic simulations suggest that vortex nucleation and the subsequent domain-wall propagation are the two primary mechanisms for magnetization reversal. The kinetics of the two pathways is examined in a manner that conforms to the observed distribution of states. (c) 2005 American Institute of Physics.
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