Abstract
The magnetization enhancement in nanoscale mechanosynthesized MgFe 2O 4 is reported and is discussed in terms of a modified core–shell model, in which a competition between the effects of spin canting and site exchange of cations plays a decisive role. Because of the nearly random distribution of cations, the surface shell of nanoparticles exhibits an effective magnetic moment that is about 2 times larger than that of the particle core. The thickness of the “magnetically active” surface shell is calculated from the size-dependent magnetization measurements.
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