Abstract
The coercivity mechanism of anisotropic Nd 2Fe 14B-based magnetic powders prepared by hydrogenation–decomposition–esorption–recombination process was studied. Polarization and corresponding differential susceptibility curves of the powders in its thermally demagnetized state were measured. Microstructure and constituents of the powders were investigated by means of transmission electron microscope and scanning electron microscope with energy dispersive X-ray detector. In addition, theoretical calculation of the intrinsic coercive force of the magnetic powders was performed. It is concluded that the magnetic hardening mechanism of the powders is the pinning of domain walls at grain boundaries of the Nd 2Fe 14B main phase and Nd-rich phase that distributes homogeneously around some conglomerations composed of fine Nd 2Fe 14B grains. The coercive force of the powders is mainly determined by the pinning of domain walls by Nd-rich boundary phase.
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