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Local dielectric measurements of BaTiO3–CoFe2O4 nanocomposites through microwave microscopy

Published online by Cambridge University Press:  03 March 2011

Yi Qi ,
Steven M. Anlage ,
H. Zheng  and
R. Ramesh
Yi Qi
Affiliation:
Materials Research Science and Engineering Center, Departments of Physics and Materials Science and Engineering, University of Maryland, College Park, Maryland 20742
Steven M. Anlage*
Affiliation:
Materials Research Science and Engineering Center, Departments of Physics and Materials Science and Engineering, University of Maryland, College Park, Maryland 20742
H. Zheng
Affiliation:
Department of Materials Science and Engineering, University of California at Berkeley, Berkley, California 94720
R. Ramesh
Affiliation:
Department of Materials Science and Engineering, University of California at Berkeley, Berkley, California 94720
*
a) Address all correspondence to this author. e-mail: anlage@squid.umd.edu
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Abstract

We report on linear and nonlinear dielectric property measurements of BaTiO3–CoFe2O4 (BTO–CFO) ferroelectromagnetic nanocomposites and pure BaTiO3 and CoFe2O4 samples with scanning near-field microwave microscopy. The permitivity scanning image with spatial resolution on the micrometer scale shows that the nanocomposites have a very uniform quality with an effective dielectric constant ɛr = 140 ± 6.4 at 3.8 GHz and room temperature. The temperature dependence of dielectric permittivity shows that the Curie temperature of pure BTO was shifted by the clamping effect of the MgO substrate, whereas the Curie temperature shift of the BTO ferroelectric phase in BTO–CFO composites is less pronounced, and if it exists at all, would be mainly caused by the CFO. Nonlinear dielectric measurements of BTO–CFO show good ferroelectric properties from the BTO.

Keywords

Dielectric propertiesFerroelectricityNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 5 , May 2007 , pp. 1193 - 1199
Copyright
Copyright © Materials Research Society 2007

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References

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