期刊
ACTA MATERIALIA
卷 162, 期 -, 页码 1-9出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2018.09.053
关键词
Nd-Fe-B magnet; FORC; XMCD; Magnetization reversal
资金
- Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials from MEXT
- Management Expenses Grants for National Universities Corporations from MEXT
- JSPS KAKENHI [17H03376]
- JST
- Collaborative Research Based on Industrial Demand
- NIMS Joint Research Hub Program
- Grants-in-Aid for Scientific Research [17H03376] Funding Source: KAKEN
First-order reversal curve (FORC) diagram, which visualizes the variation of magnetic susceptibility on a field plane, has been applied to a Nd-Fe-B sintered magnet. The FORC diagram exhibits the characteristic behavior of two remarkable spots in low-field and high-field regions. The high-field FORC spot corresponds to the irreversible magnetization reversal at a coercive field, whereas the low-field FORC spot indicates the appearance of a large magnetic susceptibility state during the demagnetization process. Moreover, this low-field FORC spot becomes dominant at high temperature, accompanied by a significant reduction in coercivity. These results suggest that the low-field FORC spot has a strong correlation with the degradation of magnetic properties of a Nd-Fe-B sintered magnet. To clarify the actual magnetization reversal processes corresponding to these two FORC spots, soft X-ray magnetic circular dichroism (XMCD) microscopy observation was employed with similar field sequences of the FORC measurements. Consequently, the low-field FORC spot is mainly attributed to the domain wall motion in multi-domain grains, whereas the high-field FORC spot corresponds to the magnetization reversal of single-domain grains. These indicate that a FORC diagram is a powerful evaluation method for the magnetization reversal processes of permanent magnets. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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