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We report on linear and non-linear dielectric property measurements of BaTiO3- CoFe2O4 (BTO-CFO) ferroelectro-magnetic nano-composites and pure BaTiO3 andCoFe2O4 samples with Scanning Near Field Microwave Microscopy. The permittivityscanning image with spatial resolution on the micro-meter scale shows that thenano-composites have very uniform quality with an effective dielectric constant\epsilon_r = 140 +/- 6.4 at 3.8 GHz and room temperature. The temperaturedependence of dielectric permittivity shows that the Curie temperature of pureBTO was shifted by the clamping effect of the MgO substrate, whereas the Curietemperature shift of the BTO ferroelectric phase in BTO-CFO composites is lesspronounced, and if it exists at all, would be mainly caused by the CFO.Non-linear dielectric measurements of BTO-CFO show good ferroelectricproperties from BTO.Comment: 6 pages, 6 figures, to be published in the Journal of Materials  Researc

Local dielectric measurements of BaTiO3–CoFe2O4 nanocomposites through microwave microscopy

Local dielectric measurements of BaTiO₃–CoFe₂O₄ nanocomposites through microwave microscopy