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From measurements of the thermoremanent magnetization (TRM) curve, at different times of measurement we have found that the peak in the TRM for a system of Fe3O4 particles curve only develops after 15 s. This indicates that this phenomenon is due to time dependence of the remanence. The time variation of the TRM was found to fit the stretched exponential test over the whole range of time examined.
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El-Hilo et al. (1991) studied this question.
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