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.
Nonlinearity in the high-electric-field piezoelectricity of epitaxial BiFeO3 on SrTiO3
Present address: Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA.
Present address: School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea.
Present address: Synchrotron X-ray Station at SPring-8, National Institute for Materials Science, Kouto, Sayo, Hyogo 679-5148, Japan.
Pice Chen, Rebecca J. Sichel-Tissot, Ji Young Jo, Ryan T. Smith, Seung-Hyub Baek, Wittawat Saenrang, Chang-Beom Eom, Osami Sakata, Eric M. Dufresne, Paul G. Evans; Nonlinearity in the high-electric-field piezoelectricity of epitaxial BiFeO3 on SrTiO3. Appl. Phys. Lett. 6 February 2012; 100 (6): 062906. https://doi.org/10.1063/1.3683533
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