Investigation on mechanism of magnetization reversal for nanocrystalline Pr-Fe-B permanent magnets by micromagnetic finite element methods

Abstract Magnetization configurations were calculated under various magnetic fields for nanocrystalline Pr-Fe-B permanent magnets by micromagnetic finite element method. According to the configurations during demagnetization process, the mechanism of magnetization reversal was analyzed. For the Pr 2 Fe 14 B with 10 nm grains or its composite with 10vol.% a-Fe, the coercivity was determined by nucleation of reversed domain that took place at grain boundaries. However, for Pr 2 Fe 14 B with 30 nm grains, coercivity was controlled by pinning of the nucleated domain. For Pr 2 Fe 14 B/a-Fe with 30vol.% a-Fe, the demagnetization behavior was characterized by continuous reversal of a-Fe moment.