Abstract
The effect of exchange-coupling interaction on domain pinning mechanism in nanometer permanent materials has been investigated using random anisotropy model. Exchange-coupling coefficient α ex has been studied, and α ex corresponding to pinning fields is derived from coercivity formula, which is expressed as α ex = 3 n α π ( 1 + β ) 1 / 2 ( 1 + β − n ) 1 / 2 . Our results show that α ex is related with the degree of exchange-coupling interaction and properties of grain boundary. Coercivity decreases with the increasing degree of exchange-coupling interaction. Our results are accordant with other relative theoretical results. In order to obtain higher coercivity, exchange-coupling interaction between magnetically hard–hard grains should be weakened.
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