Title: Unraveling the origins of electromechanical response in mixed-phase bismuth ferrite
Authors: Vasudevan, R. K.
Okatan, M. B.
Liu, Y. Y.
Jesse, S.
Yang, J. -C.
Liang, W. -I.
Chu, Y. -H.
Li, J. Y.
Kalinin, S. V.
Nagarajan, V.
Department of Materials Science and Engineering
Issue Date: 8-Jul-2013
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.
URI: http://dx.doi.org/10.1103/PhysRevB.88.020402
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.88.020402
Volume: 88
Issue: 2
End Page: 
Appears in Collections:Articles