Unraveling the origins of electromechanical response in mixed-phase bismuth ferrite

R. K. Vasudevan, M. B. Okatan, Y. Y. Liu, S. Jesse, J. C. Yang, W. I. Liang, Y. H. Chu, J. Y. Li, S. V. Kalinin, V. Nagarajan

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

The origin of giant electromechanical response in a mixed-phase rhombohedral-tetragonal BiFeO3 thin film is probed using subcoercive scanning probe microscopy based multiple-harmonic measurements. Significant contributions to the strain arise from a second-order harmonic response localized at the phase boundaries. Strain and dissipation data, backed by thermodynamic calculations, suggest that the source of the enhanced electromechanical response is the motion of phase boundaries. These findings elucidate the key role of labile phase boundaries, both natural and artificial, in achieving thin films with giant electromechanical properties.

Original languageEnglish
Article number020402
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number2
DOIs
Publication statusPublished - 2013 Jul 8

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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