Abstract
A Monte-Carlo method is used to simulate nanostructures of magnetic materials containing weakly frozen disorder in the form of nonmagnetic impurities. Systems with linear sizes L = 20–60 and spin concentrations p = 1.0 and 0.90 are considered. Temperature dependences of the thermodynamic parameters, specific heat C, susceptibility χ, and the fourth order Binder cumulants for particles with free boundaries are constructed. It is shown that a second order phase transition is observed in this model of small magnetic particles with impurities.
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