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Local dielectric measurements of BaTiO3CoFe2O4 nanocomposites through microwave microscopy

Summary: Local dielectric measurements of BaTiO3­CoFe2O4
nanocomposites through microwave microscopy
Yi Qi and Steven M. Anlagea)
Materials Research Science and Engineering Center, Departments of Physics and Materials Science
and Engineering, University of Maryland, College Park, Maryland 20742
H. Zheng and R. Rameshb)
Department of Materials Science and Engineering, University of California at Berkeley,
Berkley, California 94720
(Received 7 May 2006; accepted 18 September 2006)
We report on linear and nonlinear dielectric property measurements of
BaTiO3­CoFe2O4 (BTO­CFO) 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 r
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 BTO­CFO composites is less pronounced, and if it exists at all,
would be mainly caused by the CFO. Nonlinear dielectric measurements of BTO­CFO
show good ferroelectric properties from the BTO.


Source: Anlage, Steven - Center for Superconductivity Research & Department of Physics, University of Maryland at College Park


Collections: Materials Science