The influence of particle interactions on the superparamagnetic relaxation time has been studied by M\"ossbauer spectroscopy in samples of maghemite (y-Fe₂{O}₃$) with different particle sizes and particle separations. it is found that the relaxation time decreases with decreasing particle interactions. A new model for the influence of interactions on the superparamagetic relaxation has been derived and it is shown that this model can explain the observations.
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Mørup et al. (1994) studied this question.
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