Gong, Qihua, Yi, Min, Evans, Richard F.L. orcid.org/0000-0002-2378-8203 et al. (2 more authors) (2019) Anisotropic exchange in Nd–Fe–B permanent magnets. Materials Research Letters. pp. 89-96. ISSN 2166-3831
Abstract
The exchange is critical for designing high-performance Nd–Fe–B permanent magnets. Here we demonstrate through multiscale simulations that the exchange in Nd–Fe–B magnets, including bulk exchange stiffness (Ae) in Nd2Fe14B phase and interface exchange coupling strength (Jint>) between Nd2Fe14B and grain boundary (GB), is strongly anisotropic. Ae is larger along crystallographic a/b axis than along c axis. Even when the GB FexNd1–x has the same composition, Jint for (100) interface is much higher than that for (001) interface. The discovered anisotropic exchange is shown to have profound influence on the coercivity. These findings enable more freedom in designing Nd–Fe–B magnets by tuning exchange. IMPACT STATEMENT: Bulk exchange stiffness in Nd2Fe14B and interface exchange coupling strength between Nd2Fe14B and grain boundary are found strongly anisotropic, which have profound influence on the coercivity of Nd–Fe–B magnets.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 The Author(s) |
Keywords: | coercivity,grain boundary,interface exchange,multiscale simulations,Permanent magnets |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 03 Mar 2020 14:00 |
Last Modified: | 16 Oct 2024 16:27 |
Published Version: | https://doi.org/10.1080/21663831.2019.1702116 |
Status: | Published online |
Refereed: | Yes |
Identification Number: | 10.1080/21663831.2019.1702116 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:157922 |
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Description: 2019MaterResLett-AnisotropicExchange
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