Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session F10: Advances in Scanned Probe Microscopy 3: Scanning Probes Spectroscopic Techniques
8:00 AM–10:12 AM,
Tuesday, March 3, 2020
Room: 108
Sponsoring
Unit:
GIMS
Chair: Stephen Jesse, University of Tennessee
Abstract: F10.00001 : Direct and converse flexoelectricity: the effect of strain and electric field gradients on nanoscale electromechanical responses*
Presenter:
Neus Domingo
(Institut Català de Nanociència i Nanotecnologia (ICN2))
Authors:
Neus Domingo
(Institut Català de Nanociència i Nanotecnologia (ICN2))
Amir Abdollahi
(Universitat Politècnica de Catalunya (UPC))
Kumara Cordero Eduards
(DQMP, Université de Geneve)
Jordi Sort
(Universitat Autònoma de Barcelona (UAB))
Irene Arias
(Universitat Politècnica de Catalunya (UPC))
Gustau Catalan
(Institut Català de Nanociència i Nanotecnologia (ICN2))
In this talk, I will review how gradient-based electro-mechanical effects couples and affects the quantification of PFM measurements. I will start by showing the asymmetry in mechanical properties induced by the coupling of flexoelectricity to ferroelectricity leading to ferroelectrics as smart mechanical materials [2], and opening new opportunities to mechanically read ferroelectric polarization states in both, thin films and single crystals, on the base of Contact Resonance Frequency AFM mode. Then, I will show how converse flexoelectric effect [3] due to the presence of strong local electric field gradients at the tip end can induce a mechanical strain of the sample in dielectric centrosymmetric materials with magnitudes comparable to piezoelectric d33 coefficient.
References:
[1] H. Lu, et al., Mechanical Writing of Ferroelectric polarization, Science 336 (2012) 59.
[2] K. Cordero-Edwards, et al., Ferroelectrics as Smart Mechanical Materials, Advanced Materials,29 (2017) 1702210.
[3] Abdollahi, et al., Converse flexoelectricity yields large piezoresponse force microscopy signals in non-piezoelectric materials. Nature Communications 10 (2019) 1266
*Financial support from MINECO Grant MAT2016-77100-C2-1-P and FIS2015-73932-JIN and support of Generalitat de Catalunya (Grant No. 2017-SGR-579). ICN2 acknowledges support from the Severo Ochoa Program (MINECO, Grant SEV-2017-0706)
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