中国物理B ›› 2023, Vol. 32 ›› Issue (9): 97503-097503.doi: 10.1088/1674-1056/acaf2d

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Effect of TbF3 diffusion on the demagnetization behavior and domain evolution of sintered Nd-Fe-B magnets by electrophoretic deposition

Xue-Jing Cao(曹学静)1,2,†, Shuai Guo(郭帅)1,2, Yu-Heng Xie(谢宇恒)1,2, Lei Jin(金磊)1,2, Guang-Fei Ding(丁广飞)1,2, Bo Zheng(郑波)1,2, Ren-Jie Chen(陈仁杰)1,2, and A-Ru Yan(闫阿儒)1,2   

  1. 1 CISRI and NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
    2 CAS Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
  • 收稿日期:2022-11-14 修回日期:2022-12-22 接受日期:2022-12-30 发布日期:2023-08-28
  • 通讯作者: Xue-Jing Cao E-mail:caoxuejing@nimte.ac.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 52101238), the “Pioneer” and “Leading Goose” Research and Development Program of Zhejiang (Grant No. 2021C01190), and Major Project of Ningbo Science and Technology Innovation 2025 (Grant No. 2020Z046).

Effect of TbF3 diffusion on the demagnetization behavior and domain evolution of sintered Nd-Fe-B magnets by electrophoretic deposition

Xue-Jing Cao(曹学静)1,2,†, Shuai Guo(郭帅)1,2, Yu-Heng Xie(谢宇恒)1,2, Lei Jin(金磊)1,2, Guang-Fei Ding(丁广飞)1,2, Bo Zheng(郑波)1,2, Ren-Jie Chen(陈仁杰)1,2, and A-Ru Yan(闫阿儒)1,2   

  1. 1 CISRI and NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
    2 CAS Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
  • Received:2022-11-14 Revised:2022-12-22 Accepted:2022-12-30 Published:2023-08-28
  • Contact: Xue-Jing Cao E-mail:caoxuejing@nimte.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 52101238), the “Pioneer” and “Leading Goose” Research and Development Program of Zhejiang (Grant No. 2021C01190), and Major Project of Ningbo Science and Technology Innovation 2025 (Grant No. 2020Z046).

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摘要： We studied the magnetic properties and domain evolution of annealed and TbF3-diffused sintered Nd-Fe-B magnets using the electrophoretic deposition method. After TbF3 diffusion, the coercivity increased significantly by 9.9 kOe and microstructural analysis suggested that Tb favored the formation of the (Nd, Tb)2Fe14B shell phase in the outer region of the matrix grains. The first magnetization reversal and the dynamic successive domain propagation process were detected with a magneto-optical Kerr microscope. For the TbF3-diffused magnet, the magnetization reversal appeared at a larger applied field and the degree of simultaneous magnetization reversal decreased compared with an annealed magnet. During demagnetization after full magnetization, the occurrence of domain wall motion (DWM) in the reproduced multi-domain regions was observed by the step method. The maximum polarization change resulting from the reproduced DWM was inversely related to the coercivity. The increased coercivity for the diffused magnet was mainly attributed to the more difficult nucleation of the magnetic reversed region owing to the improved magneto-crystalline anisotropy field as a result of Tb diffusion.

关键词: sintered Nd-Fe-B magnet, electrophoretic deposition, grain boundary diffusion, domain evolution

Abstract: We studied the magnetic properties and domain evolution of annealed and TbF3-diffused sintered Nd-Fe-B magnets using the electrophoretic deposition method. After TbF3 diffusion, the coercivity increased significantly by 9.9 kOe and microstructural analysis suggested that Tb favored the formation of the (Nd, Tb)2Fe14B shell phase in the outer region of the matrix grains. The first magnetization reversal and the dynamic successive domain propagation process were detected with a magneto-optical Kerr microscope. For the TbF3-diffused magnet, the magnetization reversal appeared at a larger applied field and the degree of simultaneous magnetization reversal decreased compared with an annealed magnet. During demagnetization after full magnetization, the occurrence of domain wall motion (DWM) in the reproduced multi-domain regions was observed by the step method. The maximum polarization change resulting from the reproduced DWM was inversely related to the coercivity. The increased coercivity for the diffused magnet was mainly attributed to the more difficult nucleation of the magnetic reversed region owing to the improved magneto-crystalline anisotropy field as a result of Tb diffusion.

Key words: sintered Nd-Fe-B magnet, electrophoretic deposition, grain boundary diffusion, domain evolution

中图分类号:  (Permanent magnets)

  • 75.50.Ww
75.50.Vv (High coercivity materials) 75.60.-d (Domain effects, magnetization curves, and hysteresis) 75.60.Jk (Magnetization reversal mechanisms)