Demagnetization process and coercivity for anisotropic HDDR NdFeB bonded magnets

The demagnetization process and the coercivity mechanism for anisotropic HD DR Nd(Fe,Co)B bonded magnets were studied by comparing the dependence of co ercivity on the alignment field applied while the powders were pressed. The results showed that both the remanence and the coercivity of magnet increa sed with increasing alignment field. The demagnetization process of the mag net can be classified as the nucleation process inside the grains and the d omain-wall motion between the grains. The combined effect of two processes determines the coercivity of HDDR NdFeB bonded magnets.