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The dynamical properties of γ-Fe₂{O}₃$ particles, dispersed in a polymer, were investigated by ac susceptibility ($2×{}{10}^{{-}2} Hz<~{ν}<~{10}⁴Hz$) and M\"ossbauer spectroscopy measurements. The variation of the average blocking temperature as a function of the measuring time is satisfactorily described by a model which accounts for interparticle interactions by a statistical calculation of the dipolar energy for a disordered assembly of particles with a volume distribution and easy axes in random position.
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Dormann et al. (1996) studied this question.
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