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coercivity enhancement mechanism of Tb-diffusion Nd-Fe-B sintered magnets studied by magneto-optical Kerr optical microscope

引用

Rare Metals 2021年第3期40卷 570-574页

作者： Dan Wu Wei-Qiang Liu Ming Yue Qiong Wu Dong-Tao Zhang Qing-Mei Lu Xu-Liang Li Jing-Wu Chen Key Laboratory of Advanced Functional Materials College of Materials Science and EngineeringBeijing University of TechnologyMinistry of Education of ChinaBeijing 100124China State Key Laboratory of Rare Earth Permanent Magnetic Materials Hefei 231500China

The coercivity,microstructure,and magnetic domain structure of Nd-Fe-B sintered magnets by grain boundary diffusion process(GBDP) with TbH3 nanoparticles were systematically *** to the original magnet,the coercivity(Hci) of the GBDP magnets improved from 1702 to 2374 kA·m^(-1) with few remanence reduced from 1.338 to 1.281 *** probe microanalysis(EPMA) analysis showed that Tb diffused along grain boundary,mainly concentrated in the boundary layer of the main phase,and formed a core-shell ***-optical Kerr optical microscope(MOKE) analysis showed that there were two types of magnetic domain reversal in one grain:gradual reversal(GR) and abrupt reversal(AR).When the applied field decreased from saturated magnetic field,the reversal magnetic domain nucleated and then spread over the whole grain gradually,which was called ***,some grains kept the single domain state until Hh which was a value of reverse direction applied field in second quadrant in hysteresis *** the applied field increased above Hh,reversed magnetic domain would suddenly appear and occupy most of the area of the grain,which was called *** is because AR grains have higher reversed magnetic domain nucleation field(HRN2) than GR grains(HRN1).After GBDP,the area of AR region increased obviously and GR region decreased accordingly,indicating that the core-shell structure could change GR grain into AR *** coreshell structure could suppress flipping of the magnetization of the grains due to the large magnetic anisotropy of Tbrich ***,large AR area led to high coercivity.

关键词： coercivity enhancement mechanism Magnetic domain Grain boundary diffusion Nd-Fe-B sintered magnets

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