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  • 1 Yokohama National University Department of Physics Yokohama 240-8501 Japan
  • | 2 Tokyo Institute of Technology Materials and Structures Laboratory Yokohama 226-8503 Japan
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Abstract  

MgFe2O4 (Mg-ferrite) nanoparticles encapsulated in amorphous SiO2 were prepared by the wet chemical method. The particle sizes were estimated, based on the X-ray diffraction peaks, to be between 3 and 8 nm, depending on the annealing temperature. The particle size increased as the annealing temperature increased. From the magnetization measurements, the blocking temperature, Tb, was found to be between 30 and 60 K. The magnetization values varied with the annealing or quenching conditions. To clarify the process of crystal growth, thermogravimetric and differential thermal analysis (TG-DTA) measurements were performed and the results were compared with the X-ray diffraction patterns.

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