V. N. Nikiforov, B. L. Oksengendler, A. N. Ignatenko, V. Yu. Irkhin
The experiments on the influence of the magnetite cluster size on various magnetic properties (magnetic moment, Curie temperature, blocking temperature etc.) are performed. Both clean (uncovered) and covered clusters are investigated. The experimental data are interpreted on the basis of core-shell model. A phenomenological theory analogous to the Weitzsacker approach in the nuclear physics is developed, metrological parameters for the cluster size being discussed. The corresponding microscopical Ising model is analyzed in the mean-field approximation. To obtain more reliable conclusions and estimations, Monte Carlo simulations for the classical Heisenberg model with different bulk and surface magnetic moments are performed.
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http://arxiv.org/abs/1206.6985
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