Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 316, Issue 2, Pages E764-E767Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2007.03.087
Keywords
ferrimagnet; fine particle; cation disorder; spin canting; mechanosynthesis
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The magnetization enhancement in nanoscale mechanosynthesized MgFe2O4 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. (c) 2007 Elsevier B.V. All rights reserved.
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