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. We modeled thirteen composition distributions and calculated their coercivity by micromagnetic simulations. The results show that neither the most inhomogeneous composition distribution nor the most homogeneous composition leads to the maximum coercivity. This is due to the variation in a critical field Hcritwhich quantifies the cooperation effect of anisotropy field and magnetostatic field. This work sheds new insights into further enhancing the coercivity of Nd-Ce-Fe-B magnets by subtly adjusting composition distribution, which changes the anisotropy field distribution and the magnetostatic field distribution.