Structural and magnetic properties of NiFe2O4–SnO2 nanocomposite

The structural and magnetic properties of the NiFe2O4-SnO2 composite, obtained by ball-milling during different times. were investigated by X-ray diffraction, small-angle X-ray scattering, Mossbauer spectroscopy and vibrating sample magnetometry. The results showed the reduction of the crystalline particle size and modification in the nature of the system interfaces as a consequence of the mechanical treatment. Specimens with smaller particles displayed strong superparamagnetism. Large variation of the hysteresis loops for the different milling times was observed. (C) 2003 Elsevier B.V. All rights reserved.