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Title: Phase-field modeling of chemical control of polarization stability and switching dynamics in ferroelectric thin films

Journal Article · · Physical Review B

Phase-field simulation (PFS) has revolutionized the understanding of domain structure and switching behavior in ferroelectric thin films and ceramics. Generally, PFS is based on the solution of (a set of) Landau-Ginzburg-Devonshire equations for a defined order parameter field(s) under physical boundary conditions (BCs) of fixed potential or charge. While well matched to the interfaces in bulk materials and devices, these BCs are generally not applicable to free ferroelectric surfaces. Here, we developed a self-consistent phase-field model with BCs based on electrochemical equilibria. We chose Pb(Zr0.2Ti0.8)O3 ultrathin film consisting of (001) oriented single tetragonal domain (Pz) as a model system and systematically studied the effects of oxygen partial pressure, temperature, and surface ions on the ferroelectric state and compared it with the case of complete screening. We have further explored the polarization switching induced by the oxygen partial pressure and observed pronounced size effect induced by chemical screening. Finally, our paper thus helps to understand the emergent phenomena in ferroelectric thin films brought about by the electrochemical ionic surface compensations.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1376341
Alternate ID(s):
OSTI ID: 1338090
Journal Information:
Physical Review B, Vol. 94, Issue 23; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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Cited By (5)

Ferroelectric or non-ferroelectric: Why so many materials exhibit “ferroelectricity” on the nanoscale journal June 2017
Ferroelectric system dynamics simulated by a second-order Landau model journal September 2017
Phase-field simulations of surface charge-induced polarization switching journal March 2019
Real-time studies of ferroelectric domain switching: a review journal November 2019
Ferroelectric or non-ferroelectric: why so many materials exhibit ferroelectricity on the nanoscale preprint January 2017