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抄録
Permanent magnets are known as one of the enablers for achieving carbon neutrality due to their applications in green energy conversion. With the growing demand for permanent magnets, concerns arise regarding element criticality while maintaining the magnets’ functionality. Coercivity (resistance to magnetization reversal) is one of the most important extrinsic magnetic properties of permanent magnets, affecting their functionality. To date, coercivity enhancement has mostly been achieved by the addition of scarce elements, e.g. Dy is often used in Nd2Fe14B type permanent magnets, exacerbating the materials’ criticality. This review shows how fundamental research has provided alternative strategies for coercivity enhancement without reliance on scarce elements. Specifically, we showcase microstructural engineering, in particular fine-tuning the composition of grain boundary phase and its coverage of the matrix grains in the Nd2Fe14B type permanent magnets, has led to the development of high coercivity without reliance on Dy. Furthermore, based on micromagnetic simulations, we also discuss further microstructural modifications in the Nd2Fe14B type magnets required to push coercivity towards its physical limit. Lastly, we will demonstrate how the principles of microstructure engineering can be extended to improve the coercivity of other permanent magnets such as SmCo5-type and recently-developed SmFe12-based sintered magnets.

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  Author's final manuscript file is submitted and it is not in copyright of journal

Keyword: Permanent Magnets, Coercivity, Microstructure

Date published:

Publisher: 公益社団法人 応用物理学会

Journal:

• 応用物理 (ISSN: 03698009) vol. 93 issue. 8 p. 466-471

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4727

First published URL: https://doi.org/10.11470/oubutsu.93.8_466

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Updated at: 2025-08-01 08:30:41 +0900

Published on MDR: 2025-08-01 08:16:52 +0900