Nonlinearity in the high-electric-field piezoelectricity of epitaxial BiFeO3 on SrTiO3

The piezoelectricity of a multiferroic BiFeO3 thin film deviates from its low-field linear response in electric fields higher than 150 MV/m. Time-resolved synchrotron x-ray microdiffraction reveals a low-field piezoelectric coefficient of 55 pm/V and a steeper increase in strain at higher fields, wi...

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Veröffentlicht in:Applied physics letters 2012-02, Vol.100 (6)
Hauptverfasser: Chen, Pice, Sichel-Tissot, Rebecca J., Young Jo, Ji, Smith, Ryan T., Baek, Seung-Hyub, Saenrang, Wittawat, Eom, Chang-Beom, Sakata, Osami, Dufresne, Eric M., Evans, Paul G.
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Sprache:eng
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Zusammenfassung:The piezoelectricity of a multiferroic BiFeO3 thin film deviates from its low-field linear response in electric fields higher than 150 MV/m. Time-resolved synchrotron x-ray microdiffraction reveals a low-field piezoelectric coefficient of 55 pm/V and a steeper increase in strain at higher fields, with an effective piezoelectric coefficient of 86 pm/V. The strain reaches 2% at 281 MV/m, a factor of 1.3 higher than expected based on an extrapolation from low fields. The peak intensity of the BiFeO3 (002) Bragg reflection decreases throughout the high-electric-field regime, accompanied by increased diffuse scattering, consistent with lattice softening lattice near a field-induced phase transition.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3683533