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The temperature variation of the magnetic relaxation process obtained from dc magnetization measurements are investigated in fine Fe3O4 powder in the temperature range of 5 K<T<300 K. The maximum decay rate, S=d(M)/d[ln(t)], shows two distinct relaxation processes. The two processes display remarkably similar pronounced peaks 10, 35, 60, and 85 K below the Verwey transition (Tv) and different behavior above Tv. At the same time, high field irreversibility in M(T) curves in zero-field cooled and field cooled processes and a considerable increase in coercivity have also been observed below Tv. This is related to the freezing of disordered spins in reorganization of the domain structure.
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Seyoum et al. (2003) studied this question.
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