Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.1428791
Title: Reversal mechanism in permanent magnetic materials
Authors: Zhao, G.P. 
Lim, H.S.
Feng, Y.P.
Ong, C.K.
Liu, G.R. 
Issue Date: 1-Feb-2002
Source: Zhao, G.P., Lim, H.S., Feng, Y.P., Ong, C.K., Liu, G.R. (2002-02-01). Reversal mechanism in permanent magnetic materials. Journal of Applied Physics 91 (3) : 2186-2191. ScholarBank@NUS Repository. https://doi.org/10.1063/1.1428791
Abstract: The phenomenon of magnetization reversal in a hard magnet is studied analytically within a framework of a simplified energy minimization model for a two grain system. The transition region (a domain wall-like moment structure) is found to play a crucial role in nucleating a reversed domain and in the subsequent formation of a domain wall near the grain boundary. This is shown to result in a considerable reduction in coercivity. Temperature effects are taken into account by considering thermally activated jumps over energy barriers that hinder the motion of the transition region. We found that thermal fluctuations at room temperature can substantially reduce coercivity provided the grains are sufficiently small. © 2002 American Institute of Physics.
Source Title: Journal of Applied Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/51515
ISSN: 00218979
DOI: 10.1063/1.1428791
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