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説明:

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.

権利情報:

• In Copyright
  

キーワード: estimation of coercivity

刊行年月日: 2023-05-10

出版者: American Physical Society (APS)

掲載誌:

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

研究助成金:

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

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1103/PhysRevB.107.184422

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更新時刻: 2024-01-05 22:14:02 +0900

MDRでの公開時刻: 2023-10-17 13:30:09 +0900