2019-Sustainable Industrial Processing Summit
SIPS2019 Volume 3: Kobe Intl. Symp. / Science of Innovative and Sustainable Alloys and Magnets (SISAM)
| Editors: | F. Kongoli, M. Calin, J.M. Dubois, K. Zuzek-Rozman |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2019 |
| Pages: | 156 pages |
| ISBN: | 978-1-989820-02-5 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Effect of grain size on the coercive field of hard and soft magnetic materials
Marcos de Campos1; Jose Adilson de Castro1;1UFF - FEDERAL FLUMINENSE UNIVERSITY, Volta Redonda, Brazil;
Type of Paper: Regular
Id Paper: 208
Topic: 42
Abstract:
Several models for predicting the effect of grain size on the coercive field are presented and discussed.
For small grain size, near the mono domain grain size, a law Hc ~ 1 / D0.5 has been observed [1]. Here, Hc is the coercive field and D is the grain size. For sintered NdFeB and Strontium ferrites, the Hc ~ 1 / D0.5 law has been experimentally confirmed.
For very large grain size, however, a case of soft magnetic materials as electric steels, a Hc ~ 1 / D is observed [2].
The origin of these different behaviors is discussed [3].
We also discuss how to evaluate the effect of grain size on the coercive field by means of a nucleation model.
Keywords:
Energy applications; Magnetic Materials; Nanomaterials;References:
[1] M. F de Campos. Effect of Grain Size on the Coercivity of Sintered NdFeB Magnets. Materials Science Forum, v. 660, p. 284-289, 2010.[2] M. F. de Campos. A General Coercivity Model for Soft Magnetic Materials. Materials Science Forum, v. 727-728, p. 157-162, 2012.
[3] M. F. de Campos. Coercivity Mechanism in Hard and Soft Sintered Magnetic Materials. Materials Science Forum , v. 802, p. 563-568, 2014.