  We have developed a model for the interacting ore/shell nanoparticles, which
we used to analyze the dependence of the coercive field Hc, the remanent
saturation magnetization Mrs and the satu- ration magnetization Ms on the
interfacial exchange interaction between the core and the shell, the size of
the nanoparticles and their interaction for Fe/Fe3O4 nanoparticles have been
carried out. It has been shown that the hysteresis characteristics increase
together with the size of nanoparticles. Hc and Mrs are changing nonmonotonic
when the constant interfacial exchange interaction changes from negative to
positive values. In the system of core/shell nanoparticles, magnetic
interaction results in Hc and Mrs dropping, which was conformed by experiments.
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