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Anisotropic exchange in Nd–Fe–B permanent magnets

Gong, Qihua and Yi, Min and Evans, Richard F. L. and Gutfleisch, Oliver and Xu, Bai-Xiang (2020):
Anisotropic exchange in Nd–Fe–B permanent magnets.
In: Materials Research Letters, (3), 8. Taylor & Francis, pp. 89-96, ISSN 2166-3831,
DOI: 10.25534/tuprints-00011409,
[Online-Edition: https://doi.org/10.1080/21663831.2019.1702116],
Secondary publishing via sponsored Golden Open Access, [Article]

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.

Item Type: Article
Erschienen: 2020
Creators: Gong, Qihua and Yi, Min and Evans, Richard F. L. and Gutfleisch, Oliver and Xu, Bai-Xiang
Title: Anisotropic exchange in Nd–Fe–B permanent magnets
Language: English
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.

Journal or Publication Title: Materials Research Letters
Journal volume: 8
Number: 3
Publisher: Taylor & Francis
Divisions: DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
Date Deposited: 02 Feb 2020 20:55
DOI: 10.25534/tuprints-00011409
Official URL: https://doi.org/10.1080/21663831.2019.1702116
URN: urn:nbn:de:tuda-tuprints-114090
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