Abstract
A typical B-rich Nd–Fe–B permanent magnetic alloy with composition Nd 4.5Fe 77B 18.5 has been chosen to study the effect of an amorphous grain boundary on the exchange coupling interaction. Amorphous ribbons have been prepared by melt spinning. After optimized annealing, there is a residual amorphous grain boundary phase in the specimen. This sample exhibits better magnetic properties than the completely crystallized specimen. The remanence, remanence ratio, intrinsic coercivity and energy product of the optimum sample with a residual amorphous phase are 1.32 T, 0.86, 212 kA/m, and 130.3 kJ/m 3, respectively. X-ray diffraction, Mössbauer spectra and high-resolution TEM observation suggest that the enhancement of the remanence ratio in the magnet with a residual amorphous intergranular layer results from the amorphous grain boundary which is favorable for enhancing the exchange coupling interaction between neighboring grains. The role of the amorphous grain boundary in the exchange coupled magnet has been discussed.
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