TY - JOUR
KW - Nanostructured materials
KW - Cobalt compounds
KW - Ferroelectric materials
KW - Permittivity
KW - Near-field scanning optical microscopy
KW - Barium compounds
KW - Curie temperature
KW - Dielectric properties of solids
KW - Ferroelectromagnetic nanocomposites
KW - Nonlinear dielectric measurements
KW - Scanning near-field microwave microscopy
AU - Y Qi
AU - S.M Anlage
AU - H Zheng
AU - Ramamoorthy Ramesh
AB - 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 ∈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. Nonlinear dielectric measurements of BTO-CFO show good ferroelectric properties from the BTO. © 2007 Materials Research Society.
BT - Journal of Materials Research
DO - 10.1557/jmr.2007.0174
LA - eng
M1 - 5
N1 - cited By 4
N2 - 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 ∈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. Nonlinear dielectric measurements of BTO-CFO show good ferroelectric properties from the BTO. © 2007 Materials Research Society.
PY - 2007
SP - 1193
EP - 1199
T2 - Journal of Materials Research
TI - Local dielectric measurements of BaTiO3-CoFe2O4 nanocomposites through microwave microscopy
VL - 22
SN - 08842914
ER -