We assume a logarithmic normal distribution of activation volumes within an ensemble and study four different models of its average thermal relaxation. We extract from them a common rule for the time range on which logarithmic relaxation can be observed. We further show that to a very good approximation the coefficient of magnetic viscosity is Sᵥ=-T/({∂}〈scrE〉/{∂}H) where 〈scrE〉 is the average activation volume within the ensemble.
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Klik et al. (1993) studied this question.
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