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Local dielectric measurements of BaTiO3–CoFe2O4 nanocomposites through microwave microscopy

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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.

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Authors and Affiliations

  1. Materials Research Science and Engineering Center, Departments of Physics and Materials Science and Engineering, University of Maryland, College Park, Maryland, 20742, USA

    Yi Qi & Steven M. Anlage

  2. Department of Materials Science and Engineering, University of California at Berkeley, Berkley, California, 94720, USA

    H. Zheng & R. Ramesh

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  1. Yi Qi
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  2. Steven M. Anlage
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  3. H. Zheng
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  4. R. Ramesh
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Correspondence to Steven M. Anlage.

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This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/jmr_policy.

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Qi, Y., Anlage, S.M., Zheng, H. et al. Local dielectric measurements of BaTiO3–CoFe2O4 nanocomposites through microwave microscopy. Journal of Materials Research 22, 1193–1199 (2007). https://doi.org/10.1557/jmr.2007.0174

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  • DOI: https://doi.org/10.1557/jmr.2007.0174

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