近期，课题组与中科院物理研究所沈保根教授课题组合作的论文“Computational analysis of microstructure-coercivity relation in multi-main-phase Nd-Ce-Fe-B magnets”被英国皇家物理学会（IOP）刊物Journal of Physics D: Applied Physics录用。该工作是继课题组前期工作Acta Mater. 2017, 128: 22-30; 2018, 142 : 18-28; 2018, 146:97-105和J. Phys. D: Appl. Phys. 2018, 51: 055503之后，针对“高性价比多主相Nd-Ce-Fe-B磁体的矫顽力机制”这一问题而取得的新进展。摘要如下：

Multi-main-phase (MMP) (Nd, Ce)2Fe14B magnets containing both Nd-rich shell @ Ce-rich core and Ce-rich shell @ Nd-rich core within the 2:14:1 grains have shown much superior coercivity to the single-main-phase ones with homogeneous Nd/Ce distributions. To understand how these core-shell grains and the microstructure of grain boundaries (GBs) influence the coercivity of MMP Nd-Ce-Fe-B magnets, micromagnetic simulation was carried out through constructing a three-dimensional finite element model. The influences of physical dimension and magnetism of the GBs, Nd or Ce-rich shell thickness, and Ce substitution level on coercivity were all analyzed. It was found that thick and nonmagnetic GB layers play an essential role in enhancing the coercivity as the intergrain exchange coupling can be weakened. Thicker Nd-rich or Ce-rich 2:14:1 grain shells are not necessary for enhancing the coercivity. In addition, with the increase of Ce content, the coercivity doesn’t deteriorate linearly but exhibits an abnormal enhancement around 20 vol.% substitution. The good agreement with the experiments makes these findings as important insights of understanding the coercivity mechanism of MMP RE-Fe-B magnets.