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In this article the effects of dipolar and exchange interactions on the magnetoresistance curves in granular solids has been calculated using a generalized 3-d Monte Carlo model. This model allows the final configuration of magnetic moments to be calculated as a function of concentration, temperature, and magnetic field. The results show that interaction effects give rise to a finite resistivity in small magnetic fields. The magnitude of this finite magnetoresistance is found to increase with increasing concentration. Thus the maximum change in MR with field is found to be lowered by the interaction effects.
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El-Hilo et al. (1994) studied this question.
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