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Synthesis and Characterization of BaTiO3/CoFe2O4 thin films

Published online by Cambridge University Press:  12 July 2011

Helen R. C. S. Andrade,
Luciana M. Seara and
Nelcy D. S. Mohallem
Helen R. C. S. Andrade
Affiliation:
Laboratory of Nanostructured Materials, DQ/UFMG, Belo Horizonte-MG, Brazil
Luciana M. Seara
Affiliation:
Microscopy Centre, UFMG, Belo Horizonte-MG, Brazil
Nelcy D. S. Mohallem*
Affiliation:
Laboratory of Nanostructured Materials, DQ/UFMG, Belo Horizonte-MG, BrazilMicroscopy Centre, UFMG, Belo Horizonte-MG, Brazil
*
*nelcy@ufmg.br
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Abstract

Nanocomposites formed by ferrimagnetic and ferroelectric materials are multiferroic material in which magnetoelectric coupling occurs via piezoelectricity and magnetostriction phenomena. These nanocomposites have a variety of applications in tunable microwave devices using electric control of spin wave propagation or new magnetic memories in which the magnetic response is controlled by electric field.

In this work, transparent and homogeneous thin films of barium titanate interleaved with cobalt ferrite were prepared by sol–gel method using dip-coating process. Films of pure barium titanate and cobalt ferrite were also prepared for comparison. The nanocomposite films were deposited onto clean quartz substrates, where a coating of each material was deposited interleaved, where the cobalt ferrite film formed the last layer. The films were dried in air after each dipping and heated at 900 o C for 1 hour to convert the amorphous films into crystalline ones. The samples were characterized by low angle X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM) and UV-Vis spectroscopy.

Keywords

sol-gelmagnetic propertiesferroelectric

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References

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