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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. pp. 89-96, ISSN 2166-3831,
DOI: 10.25534/tuprints-00011579,
[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 ([Math Processing Error]) 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.

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.

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 ([Math Processing Error]) 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.

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.

Journal or Publication Title: Materials Research Letters
Journal volume: 8
Number: 3
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Mechanics of functional Materials
Date Deposited: 29 Mar 2020 19:57
DOI: 10.25534/tuprints-00011579
Official URL: https://doi.org/10.1080/21663831.2019.1702116
URN: urn:nbn:de:tuda-tuprints-115791
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