Anisotropic exchange in Nd–Fe–B permanent magnets

Qihua Gong; Min Yi; Richard F. L. Evans; Oliver Gutfleisch; Bai-Xiang Xu

doi:10.1080/21663831.2019.1702116

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Anisotropic exchange in Nd–Fe–B permanent magnets

Original Report | 更新时间：2026-08-19

- Anisotropic exchange in Nd–Fe–B permanent magnets
- Materials Research Letters Vol. 8, Issue 3, Pages: 89-96(2020)
- 作者机构：
  
  1. Institute of Materials Science Technische Universität Darmstadt
  2. Institute of Materials Science Technische Universität Darmstadt Darmstadt Germany
  3. State Key Lab of Mechanics and Control of Mechanical Structures & Key Lab for Intelligent Nano Materials and Devices of Ministry of Education & College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics (NUAA)
  4. Department of Physics The University of York
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2019.1702116
  CLC：
- Online First：18 December 2019，
  
  Published：2020
- 稿件说明：
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Qihua Gong, Min Yi, Richard F. L. Evans, et al. Anisotropic exchange in Nd–Fe–B permanent magnets[J]. Materials Research Letters, 2020, 8(3): 89-96.
DOI：

Qihua Gong, Min Yi, Richard F. L. Evans, et al. Anisotropic exchange in Nd–Fe–B permanent magnets[J]. Materials Research Letters, 2020, 8(3): 89-96. DOI： 10.1080/21663831.2019.1702116.

摘要

Abstract

BSTRACTThe 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 (

) in Nd

B phase and interface exchange coupling strength (Jint) between Nd

B and grain boundary (GB)

is strongly anisotropic.

is larger along crystallographic

axis than along

axis. Even when the GB Fe

1–

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.

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