Magnetic viscosity experiments and the calculated results show that there exists a linear relationship between log H c and log v -1 for RE-TM-B permanent magnets. This result agrees well with the theoretical equation, log H c =log v -1 +F L (T. . .), which was deduced from the localized weak domain-wall pinning model, where H c is the coercive force, v is the activation volume and F L (T. . .) is a complex function.
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HE-LIE et al. (1992) studied this question.
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