Abstract
Experiments demonstrate that the magnetization of Fex(SiO2)1−x-nanocomposite at magnetic fields H⩽20T depends rather weakly on temperature T=4–300K. Thus, the Langevin model for the magnetization is invalid. We explain our results in the frame of a simple model taking into account distributions of non-spherical granules’ orientations and forms. Calculated field dependence of the magnetization agrees with the experiment everywhere except for the fields H∼10kOe, where calculated values are somewhat higher (up to ∼20%) than experimental ones. These discrepancies are related to the magnetic “glass” behavior of the magnetization.
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