Effect of TbF_(3)diffusion on the demagnetization behavior and domain evolution of sintered Nd-Fe-B magnets by electrophoretic deposition  

作　　者：曹学静 郭帅 谢宇恒 金磊 丁广飞 郑波 陈仁杰 闫阿儒 Xue-Jing Cao;Shuai Guo;Yu-Heng Xie;Lei Jin;Guang-Fei Ding;Bo Zheng;Ren-Jie Chen;A-Ru Yan(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;CAS Key Laboratory of Magnetic Materials and Devices,Ningbo Institute of Material Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China)

机构地区：[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

出　　处：《Chinese Physics B》2023年第9期481-485,共5页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.52101238);the“Pioneer”and“Leading Goose”Research and Development Program of Zhejiang(Grant No.2021C01190);Major Project of Ningbo Science and Technology Innovation 2025(Grant No.2020Z046)。

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 TbF_(3)diffusion,the coercivity increased significantly by 9.9 kOe and microstructural analysis suggested that Tb favored the formation of the(Nd,Tb)_(2)Fe_(14)B 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 TbF_(3)-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 

分 类 号：O469[理学—凝聚态物理]