Nonlinear piezoelectricity in epitaxial ferroelectrics at high electric fields |
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Authors: | Grigoriev Alexei Sichel Rebecca Lee Ho Nyung Landahl Eric C Adams Bernhard Dufresne Eric M Evans Paul G |
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Institution: | Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706, USA. |
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Abstract: | Nonlinear effects in the coupling of polarization with elastic strain have been predicted to occur in ferroelectric materials subjected to high electric fields. Such predictions are tested here for a PbZr0.2Ti0.8O3 ferroelectric thin film at electric fields in the range of several hundred MV/m and strains reaching up to 2.7%. The piezoelectric strain exceeds predictions based on constant piezoelectric coefficients at electric fields from approximately 200 to 400 MV/m, which is consistent with a nonlinear effect predicted to occur at corresponding piezoelectric distortions. |
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