A novel coercivity enhancement method of Nd-Ce-Fe-B magnets by adjusting anisotropy field distribution and magnetostatic field distribution

Abstract In order to give full play to the potential of Nd-Ce-Fe-B magnets and increase the coercivity of magnets with a fixed average composition, the influence of the cooperation effect of anisotropy field and magnetostatic field on their coercivity was studied. Micromagnetic simulations revealed that neither the most heterogeneous composition distribution nor the most homogeneous composition resulted in the highest coercivity. This is due to the variation in a critical field H crit which quantifies the cooperation effect of anisotropy field and magnetostatic field. By subtly changing the composition distribution of the Nd-Ce-Fe-B magnets, this work provides a new perspective for further improvement of the coercivity. This adjustment modifies the anisotropy field distribution and the magnetostatic field distribution.