Nonlinear phenomena in multiferroic nanocapacitors: joule heating and electromechanical effects

Yunseok Kim, Amit Kumar, Alexander Tselev, Ivan I Kravchenko, Hee Han, Ionela Vrejoiu, Woo Lee, Dietrich Hesse, Marin Alexe, Sergei V Kalinin, Stephen Jesse

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

We demonstrate an approach for probing nonlinear electromechanical responses in BiFeO(3) 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 BiFeO(3) 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.
Original languageEnglish
Pages (from-to)9104-12
Number of pages9
JournalACS Nano
Volume5
Issue number11
DOIs
Publication statusPublished - 2011

Bibliographical note

© 2011 American Chemical Society

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