中国物理B ›› 2025, Vol. 34 ›› Issue (8): 87503-087503.doi: 10.1088/1674-1056/adda0c

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Investigation of magnetic domain evolutions and microstructural changes in Pr-Dy-Cu modified Nd-Fe-B magnets

Peng Shen(沈鹏)1, Hui-Dong Qian(千辉东);1,†, Jingzhi Han(韩景智);1,‡, Tao Liu(刘涛)2, Zhen Yan(闫震)3, Ming Ji(姬明)4, Lei Zhou(周磊)2, Weiqiang Liu(刘卫强)4, Shunquan Liu(刘顺荃)1, Wenyun Yang(杨文云)1, Yan Li(李岩)5, Huihui Cao(曹慧慧)3, Ming Yue(岳明)4, Jinbo Yang(杨金波);1,2, and Yingchang Yang(杨应昌)1   

  1. 1 Institute of Condensed Matter and Material Physics, School of Physics, Peking University, Beijing 100871, China;
    2 Advanced Technology & Materials Co., Ltd., Beijing 100081, China;
    3 Rare Earth Advanced Materials Technology Innovation Center, Inner Mongolia Northern Rare Earth Advanced Materials Technology Innovation Co., Ltd., Baotou 014030, China;
    4 Faculty of Materials and Manufacturing, Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing 100124, China;
    5 Inner Mongolia University of Science & Technology, Baotou 014010, China
  • 收稿日期:2025-03-19 修回日期:2025-05-06 接受日期:2025-05-19 出版日期:2025-07-17 发布日期:2025-08-18
  • 通讯作者: Hui-Dong Qian, Jingzhi Han E-mail:qianhuidong@pku.edu.cn;hanjingzhi@pku.edu.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant Nos. 2021YFB3500300, 2023YFB3507000, and 2023XYJG0001-01-03), the National Natural Science Foundation of China (Grant No. 52171167), and Inner Mongolia Northern Rare Earth Advanced Materials Technology Innovation Co., Ltd. Project (Grant No. CXZXB-202304-0004).

Investigation of magnetic domain evolutions and microstructural changes in Pr-Dy-Cu modified Nd-Fe-B magnets

Peng Shen(沈鹏)1, Hui-Dong Qian(千辉东);1,†, Jingzhi Han(韩景智);1,‡, Tao Liu(刘涛)2, Zhen Yan(闫震)3, Ming Ji(姬明)4, Lei Zhou(周磊)2, Weiqiang Liu(刘卫强)4, Shunquan Liu(刘顺荃)1, Wenyun Yang(杨文云)1, Yan Li(李岩)5, Huihui Cao(曹慧慧)3, Ming Yue(岳明)4, Jinbo Yang(杨金波);1,2, and Yingchang Yang(杨应昌)1   

  1. 1 Institute of Condensed Matter and Material Physics, School of Physics, Peking University, Beijing 100871, China;
    2 Advanced Technology & Materials Co., Ltd., Beijing 100081, China;
    3 Rare Earth Advanced Materials Technology Innovation Center, Inner Mongolia Northern Rare Earth Advanced Materials Technology Innovation Co., Ltd., Baotou 014030, China;
    4 Faculty of Materials and Manufacturing, Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing 100124, China;
    5 Inner Mongolia University of Science & Technology, Baotou 014010, China
  • Received:2025-03-19 Revised:2025-05-06 Accepted:2025-05-19 Online:2025-07-17 Published:2025-08-18
  • Contact: Hui-Dong Qian, Jingzhi Han E-mail:qianhuidong@pku.edu.cn;hanjingzhi@pku.edu.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant Nos. 2021YFB3500300, 2023YFB3507000, and 2023XYJG0001-01-03), the National Natural Science Foundation of China (Grant No. 52171167), and Inner Mongolia Northern Rare Earth Advanced Materials Technology Innovation Co., Ltd. Project (Grant No. CXZXB-202304-0004).

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摘要： The enhancement of coercivity in Nd-Fe-B sintered magnets modified by Pr$_{58}$Dy$_{10}$Cu$_{32}$ alloy was investigated through scanning electron microscope (SEM) and in-situ magneto-optic Kerr effect (MOKE) microscopy. The modification treatment resulted in the formation of a smooth and continuous weakly magnetic grain boundary layer and the (Nd,Pr,Dy)$_{2}$Fe$_{14}$B main phase with a high magnetocrystalline anisotropy field, leading to an increased coercivity of 23 kOe. MOKE observations revealed that the dynamic evolution of the maze domain area under an external magnetic field varied significantly between the original and modified magnets. Compared with the original magnets, the modified magnets exhibited a slower decrease in maze domain area during magnetization and a slower increase during reverse magnetization, contributing to the observed coercivity enhancement.

关键词: Nd-Fe-B sintered magnets, high coercivity, Pr-Dy-Cu, magnetic domain

Abstract: The enhancement of coercivity in Nd-Fe-B sintered magnets modified by Pr$_{58}$Dy$_{10}$Cu$_{32}$ alloy was investigated through scanning electron microscope (SEM) and in-situ magneto-optic Kerr effect (MOKE) microscopy. The modification treatment resulted in the formation of a smooth and continuous weakly magnetic grain boundary layer and the (Nd,Pr,Dy)$_{2}$Fe$_{14}$B main phase with a high magnetocrystalline anisotropy field, leading to an increased coercivity of 23 kOe. MOKE observations revealed that the dynamic evolution of the maze domain area under an external magnetic field varied significantly between the original and modified magnets. Compared with the original magnets, the modified magnets exhibited a slower decrease in maze domain area during magnetization and a slower increase during reverse magnetization, contributing to the observed coercivity enhancement.

Key words: Nd-Fe-B sintered magnets, high coercivity, Pr-Dy-Cu, magnetic domain

中图分类号:  (Studies of specific magnetic materials)

  • 75.50.-y
77.80.Dj (Domain structure; hysteresis) 81.05.-t (Specific materials: fabrication, treatment, testing, and analysis)