Magnetic nanocomposite thin films prepared by sol-gel process
AUTOR(ES)
Mohallem, Nelcy D. S., Seara, Luciana M., Novak, Miguel A., Sinnecker, Elis H. C. P.
FONTE
Brazilian Journal of Physics
DATA DE PUBLICAÇÃO
2006-09
RESUMO
Cobalt ferrite composite thin films, CoFe2O4/SiO2, were prepared by sol-gel process, using tetraethylorthosilicate (TEOS) as a precursor for silica, and metallic nitrates as precursors for ferrite. The obtained dip-coated films thermally treated at 550, 750, and 950 ºC were transparent, homogeneous and adherent. Their magnetic properties were measured from 2.5 K to 300 K using a SQUID magnetometer. Superparamagnetic behaviour was observed at room temperature and below a blocking temperature appears with coercivity values increasing with annealing temperature.
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