A multilevel master equation formalism is used to describe the relaxational dynamics of thermally relaxing ferromagnetic particles with dipolar interactions. For weak coupling the transition probabilities between distinct metastable configurations of the entire particle array are found perturbatively within the coherent rotation approximation. The hysteresis properties and the number of metastable configurations contributing to the magnetization reversal process are studied as functions of the array geometry. A change in the effective number of metastable states is found to be accompanied by a local maximum in the value of the switching field distribution function at coercivity.
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Klik et al. (1995) studied this question.
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