Abstract
The tunnel theory was presented in the previous paper in order to analyze aggregation phenomena in magnetic fluids under an applied magnetic field. The cluster-cluster interaction is taken into account in this model. The present study applies this tunnel theory to stronger particle-particle interactions to clarify the dependencies of mean particle number per cluster on the strength of particle-particle interactions. Furthermore, Monte Carlo simulations are carried out to clarify the aggregate structures of ferromagnetic particles, in which our cluster-moving Monte Carlo algorithm is used. The main results obtained here are as follows : the number densities of particles have an influence on the size of clusters : the larger the number densities are, the bigger the clusters will be ; the size of clusters increases exponentially with magnetic interactions between particles beyond certain values ; the number densities of large clusters relatively increase as particle-particle interactions become large ; the results of the tunnel theory are in qualitative agreement with those of Monte Carlo simulations.
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