Measurements of the low-field thermoremanent relaxation in a reentrant (Fe0.65Ni0.35)1−xMnx ferromagnet with x=0.117 reveal a crossover, in the vicinity of the reentrant transition, from equilibrium dynamics in the ferromagnetic phase to age-dependent, nonequilibrium dynamics in the reentrant phase. Least-squares fits to two mesoscopically exact relaxation functions show that both dynamic regimes can be described within a common theoretical framework of magnon relaxation on a percolation distribution of fixed, finite domains of dynamically correlated spins.
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Li et al. (1994) studied this question.
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