Abstract
A systematic investigation on the effects of grain boundary configuration and characteristics on the demagnetization process and magnetic properties of NdFeB magnets is carried out by micromagnetic simulation based on a periodic anisotropic model. The results indicate that, when the grain boundary phase is perpendicular to the easy axis, the demagnetization field is along the positive Z axis and the magnetic moments rotate difficultly due to the dipolar coupling. When the grain boundary phase is parallel to the easy axis, the demagnetization field is along the negative Z axis and the magnetic moments rotate easily. The best hard magnetic properties can be obtained by reducing the thickness and saturation magnetization of grain boundary phase distributed parallel to the easy axis and reducing the exchange stiffness of grain boundary phase perpendicular to the easy axis.
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