Abstract
Macroscopic demagnetization in sintered Nd-Fe-B magnets by Tb grain boundary diffusion (GBD) is investigated in comparison with non-GBD ones. Demagnetization curves, the coercivity distributions, Tb content, and magnetic fields of the magnets at various external fields (μ0Hext) are analyzed. As μ0Hext approaches coercivity of the GBD magnet, S-N poles form near the center, between and parallel to the original N-S poles, indicating the magnetization reversal near the center of the GBD magnet. This is distinguished from the non-GBD magnets where demagnetization occurs mainly in the pole surfaces. The mechanism for macroscopic demagnetization is discussed.
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