Journal
ACS NANO
Volume 5, Issue 11, Pages 9104-9112Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn203342v
Keywords
multiferroic nanocapacitor; conduction; nonlinear response; Joule heating; PFM
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Funding
- Oak Ridge National Laboratory by the Office of Basic Energy Sciences, U.S. Department of Energy
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We demonstrate an approach for probing nonlinear electromechanical responses in BiFeO3 thin film nanocapacitors using half-harmonic band excitation piezoresponse force microscopy (PFM). Nonlinear PFM Images of nanocapacitor arrays show clearly visible clusters of capacitors associated with variations of local leakage current through the BiFeO3 film. Strain spectroscopy measurements and finite element modeling point to significance of the Joule heating and show that the thermal effects caused by the Joule heating can provide nontrivial contributions to the nonlinear electromechanical responses in ferroic nanostructures. This approach can be further extended to unambiguous mapping of electrostatic signal contributions to PFM and related techniques.
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