Journal
SCRIPTA MATERIALIA
Volume 89, Issue -, Pages 29-32Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2014.06.020
Keywords
Micromagnetic simulations; Nd-Fe-B sintered magnets; Coercivity; Demagnetization field
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Funding
- Japan Science and Technology Agency (JST), CREST
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Micromagnetic simulations of magnetization reversals of Nd-Fe-B anisotropic magnets with exchange-coupled grains demonstrate that the local demagnetization factor decreases as the grain size is reduced. This explains the higher coercivity and the lower temperature dependence of coercivity in magnets with smaller grain sizes. When a fraction of Nd2Fe14B grains become a single domain state for average grain sizes <1 mu m, a higher magnetic field is needed to magnetize them, giving rise to a two-step initial magnetization curve. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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