Abstract
The oscillatory behavior of the average magnetic moment as a function of the cluster size and shape is studied. Based on Monte Carlo simulation, the temperature dependence of magnetic moment with different cluster size is studied for free and embedded Co clusters. It is found that the oscillations superimposed on the moment decrease are associated with not only the geometrical structure effects but also the thermal fluctuation roles. The fitting results on the temperature dependence of moment for both free and embedded clusters by using Bloch exponent law reveal that differences between them exist. At the same time, the simulated results are compared with the experimental facts.
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