Abstract
Nanocrystalline magnetite Fe 3O 4 embedded in a non-magnetic matrix was formed by heat treatment of CaSiBFeoxide glass. Small Angle Neutron Scattering (SANS) revealed a bimodal volume size distribution for the nanocrystalline phase with maxima centred at radii of 2.5 nm and 10 nm, respectively. The magnetic scattering behaviour is characteristic for superparamagnetism of single-domain particles following the Langevin statistics. Both fractions of nanocrystals are composed by a superparamagnetic core surrounded by a non-magnetic surface layer. Magnetisation measurements indicate different thermal variation of the superparamagnetic moments in both fractions of nanocrystals.
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