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Abstract
The effect of the measuring process on the magnitude of the inter-particle interaction has been investigated by measuring the superparamagnetic relaxation for magnetite particles dispersed in calciumsilicate glasses using thermoremanent magnetization (TRM), AC susceptibility and Mössbauer spectroscopy measurements: The temperature dependence of the remanent magnetization in TRM measurements can be explained by Néel's theory which describes the superparamagnetic relaxation of a noninteracting particle. On the other hand, the relation between log 10 τ m ( τ m: the measurement time) and 1 T B ( T B: the average blocking temperature) in AC susceptibility measurements can be interpreted using Dormann's model in which the inter-particle interaction is taken into account. Therefore, it can be concluded that the measuring process for the superparamagnetic relaxation can be more or less sensitive to the inter-particle interaction.
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