Physics – Condensed Matter – Materials Science
Scientific paper
2006-01-03
J. Mat. Res. 22, 1193-1199 (2007)
Physics
Condensed Matter
Materials Science
6 pages, 6 figures, to be published in the Journal of Materials Research
Scientific paper
10.1557/jmr.2007.0174
We report on linear and non-linear dielectric property measurements of BaTiO3 - CoFe2O4 (BTO-CFO) ferroelectro-magnetic nano-composites and pure BaTiO3 and CoFe2O4 samples with Scanning Near Field Microwave Microscopy. The permittivity scanning image with spatial resolution on the micro-meter scale shows that the nano-composites have very uniform quality with an effective dielectric constant \epsilon_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 BTO-CFO composites is less pronounced, and if it exists at all, would be mainly caused by the CFO. Non-linear dielectric measurements of BTO-CFO show good ferroelectric properties from BTO.
Anlage Steven M.
Qi Yi
Ramesh Ramamoorthy
Zheng Han-qing
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