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Title: Giant optical enhancement of strain gradient in ferroelectric BiFeO3 thin films and its physical origin

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep16650· OSTI ID:1237489
 [1];  [2];  [3];  [3];  [4];  [1];  [5];  [6];  [7];  [1];  [1];  [3]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Stanford Univ., CA (United States)
  3. Univ. of Wisconsin, Madison, WI (United States)
  4. Univ. of Connecticut, Storrs, CT (United States)
  5. Northwestern Univ., Evanston, IL (United States)
  6. Northwestern Univ., Evanston, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  7. Cornell Univ., Ithaca, NY (United States); Cornell Univ., Ithaca, NY (United States). Kavli Inst. for Nanoscale Science

Through mapping of the spatiotemporal strain profile in ferroelectric BiFeO3 epitaxial thin films, we report an optically initiated dynamic enhancement of the strain gradient of 105–106 m-1 that lasts up to a few ns depending on the film thickness. Correlating with transient optical absorption measurements, the enhancement of the strain gradient is attributed to a piezoelectric effect driven by a transient screening field mediated by excitons. In conclusion, these findings not only demonstrate a new possible way of controlling the flexoelectric effect, but also reveal the important role of exciton dynamics in photostriction and photovoltaic effects in ferroelectrics.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; FG02-10ER46147
OSTI ID:
1237489
Journal Information:
Scientific Reports, Vol. 5; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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Cited By (10)

Tuning Ultrafast Photoinduced Strain in Ferroelectric‐Based Devices journal May 2019
Selector-free resistive switching memory cell based on BiFeO3 nano-island showing high resistance ratio and nonlinearity factor journal March 2016
Role of temperature-dependent electron trapping dynamics in the optically driven nanodomain transformation in a PbTiO 3 /SrTiO 3 superlattice journal January 2020
Photostriction and elasto-optic response in multiferroics and ferroelectrics from first principles journal January 2018
Ab initio approach to photostriction in classical ferroelectric materials journal July 2017
Optical Writing of Magnetic Properties by Remanent Photostriction journal September 2016
Role of temperature-dependent electron trapping dynamics in the optically driven nanodomain transformation in a PbTiO${_3}$/SrTiO${_3}$ superlattice text January 2019
Quantification of flexoelectricity in PbTiO3/SrTiO3 superlattice polar vortices using machine learning and phase-field modeling journal November 2017
Rolling dopant and strain in Y-doped BiFeO3 epitaxial thin films for photoelectrochemical water splitting journal October 2018
Infrared Spectroscopic Evidences of Strong Electronic Correlations in (Sr1−xLax)3Ir2O7 journal September 2016