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High coercivity is an important property of permanent magnets for application in energy conversion devices. The Nd magnet, Nd2Fe14B, is a typical material. Because coercivity is a long-time relaxation phenomenon, which originates from a strong metastable magnetic state, it is difficult to estimate coercive field (coercive force) studying the time evolution dynamics simulation of a model with atomistic parameters under the limitation of the simulation time. In our recent study [M. Nishino et al., Phys. Rev. B 102, 020413(R) (2020)], we presented a method to estimate coercivity using a statistical method to extend the limitation of simulation time and evaluated appropriately the coercive field of a single grain of the Nd magnet. In the present study, we propose an alternative method to estimate coercivity more conveniently using the field-dependent survival (nonreversal) probability generated by a time evolution simulation under a field sweep.We demonstrate that the coercive field of the single grain can be estimated. In this method, not only coercive field but also the zero-field energy barrier and field for the zero-energy barrier can be estimated. We discuss detailed features of the estimation of these quantities.

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Keyword: estimation of coercivity

Date published: 2023-05-10

Publisher: American Physical Society (APS)

Journal:

• PHYSICAL REVIEW B (ISSN: 24699950) vol. 107 issue. 18 p. 184422-184422

Funding:

• MEXT ESICMM (Grant No. 12016013) (Element Strategy Initiative)

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1103/PhysRevB.107.184422

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Updated at: 2024-01-05 22:14:02 +0900

Published on MDR: 2023-10-17 13:30:09 +0900