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Large dielectric response to the paramagnetic-ferromagnetic transition (T_(C) ~ 100 K) in multiferroic BiMnO_(3) epitaxial thin films

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Schmidt, Rainer and Eerenstein, Wilma and Midgley, Paul A. (2009) Large dielectric response to the paramagnetic-ferromagnetic transition (T_(C) ~ 100 K) in multiferroic BiMnO_(3) epitaxial thin films. Physical review B, 79 (21). ISSN 1098-0121

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Official URL: http://dx.doi.org/10.1103/PhysRevB.79.214107


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Abstract

The dielectric properties of multiferroic BiMnO_(3) 50 nm epitaxial thin films grown on Nb-doped SrTiO_(3)(001) substrates were analyzed by impedance spectroscopy between 55 and 155 K. One single intrinsic thin film dielectric relaxation process was deconvoluted from an extrinsic electrode interface contribution by the use of an equivalent circuit. The paramagnetic-ferromagnetic transition (T_(C) ~ 100 K was reflected by a large peak in the thin film relative dielectric permittivity. The weak dielectric response at T_(C) observed previously in BiMnO_(3) polycrystals is largely enhanced in thin films. Intrinsic noninsulating thin film resistivity below T_(C) was detected.


Item Type:Article
Additional Information:

© 2009 The American Physical Society. The authors wish to thank Finlay Morrison, Ian Reaney, and Jan Pokorny for useful discussions. R.S. wishes to acknowledge financial support from the Leverhulme Trust. W.E. is grateful to the EU.

Uncontrolled Keywords:Polarization; Perovskite.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:32653
Deposited On:30 Jul 2015 09:39
Last Modified:10 Dec 2018 14:58

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