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We perform Metropolis Monte Carlo simulations of the behaviour of a film ofinsulating material containing a distribution of magnetic nanoparticles. Weassume that these particles only interact through dipolar forces and we findthat their behaviour at low T shows characteristics of a spin-glass with afreezing T_f at which the linear susceptibility and the specific heat show amaximum. We obtain the spin glass order parameter as a function of temperatureand we also calculate the time auto-correlation of the spin at the center ofthe system. We find that these results are consistent with the temperaturedependence of the variance and the mean of the local field at the central spin.

Dipolar-glass behaviour of an insulating film containing nanogranular Fe particles