TY - JOUR
T1 - Mesoscopic harmonic mapping of electromechanical response in a relaxor ferroelectric
AU - Vasudevan, Rama K.
AU - Zhang, Shujun
AU - Ding, Jilai
AU - Okatan, M. Baris
AU - Jesse, Stephen
AU - Kalinin, Sergei V.
AU - Bassiri-Gharb, Nazanin
N1 - Publisher Copyright:
© 2015 AIP Publishing LLC.
PY - 2015/6/1
Y1 - 2015/6/1
N2 - Relaxor-ferroelectrics are renowned for very large electrostrictive response, enabling applications in transducers, actuators, and energy harvesters. However, insight into the dissimilar contributions (polarization rotation, wall motion) to the electromechanical response from electrostrictive strain, and separation of such contributions from linear piezoelectric response are largely ignored at the mesoscale. Here, we employ a band-excitation piezoresponse force microscopy (BE-PFM) technique to explore the first and second harmonics of the piezoelectric response in prototypical relaxor-ferroelectric 0.72Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 (PMN-0.28PT) single crystals. Third order polynomial fitting of the second harmonic reveals considerable correlation between the cubic coefficient map and the first harmonic piezoresponse amplitude. These results are interpreted under a modified Rayleigh framework, as evidence for domain wall contributions to enhanced electromechanical response. These studies highlight the contribution of domain wall motion in the electromechanical response of relaxor ferroelectrics, and further show the utility of harmonic BE-PFM measurements in spatially mapping the mesoscopic variability inherent in disordered systems.
AB - Relaxor-ferroelectrics are renowned for very large electrostrictive response, enabling applications in transducers, actuators, and energy harvesters. However, insight into the dissimilar contributions (polarization rotation, wall motion) to the electromechanical response from electrostrictive strain, and separation of such contributions from linear piezoelectric response are largely ignored at the mesoscale. Here, we employ a band-excitation piezoresponse force microscopy (BE-PFM) technique to explore the first and second harmonics of the piezoelectric response in prototypical relaxor-ferroelectric 0.72Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 (PMN-0.28PT) single crystals. Third order polynomial fitting of the second harmonic reveals considerable correlation between the cubic coefficient map and the first harmonic piezoresponse amplitude. These results are interpreted under a modified Rayleigh framework, as evidence for domain wall contributions to enhanced electromechanical response. These studies highlight the contribution of domain wall motion in the electromechanical response of relaxor ferroelectrics, and further show the utility of harmonic BE-PFM measurements in spatially mapping the mesoscopic variability inherent in disordered systems.
UR - http://www.scopus.com/inward/record.url?scp=84930627957&partnerID=8YFLogxK
U2 - 10.1063/1.4921925
DO - 10.1063/1.4921925
M3 - Article
AN - SCOPUS:84930627957
SN - 0003-6951
VL - 106
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 22
M1 - 222901
ER -