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

Abstract

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(Zr 0.2Ti 0.8)O 3 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.

Authors:
ORCiD logo [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1376341
Alternate Identifier(s):
OSTI ID: 1338090
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 23; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Cao, Ye, and Kalinin, Sergei V. Phase-field modeling of chemical control of polarization stability and switching dynamics in ferroelectric thin films. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.235444.
Cao, Ye, & Kalinin, Sergei V. Phase-field modeling of chemical control of polarization stability and switching dynamics in ferroelectric thin films. United States. doi:10.1103/PhysRevB.94.235444.
Cao, Ye, and Kalinin, Sergei V. Thu . "Phase-field modeling of chemical control of polarization stability and switching dynamics in ferroelectric thin films". United States. doi:10.1103/PhysRevB.94.235444. https://www.osti.gov/servlets/purl/1376341.
@article{osti_1376341,
title = {Phase-field modeling of chemical control of polarization stability and switching dynamics in ferroelectric thin films},
author = {Cao, Ye and Kalinin, Sergei V.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.94.235444},
journal = {Physical Review B},
number = 23,
volume = 94,
place = {United States},
year = {2016},
month = {12}
}

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Cited by: 6 works
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