Abstract
Emergent behaviors in antiferroelectric thin films due to a coupling between surface electrochemistry and intrinsic polar instabilities are explored within the framework of the modified 2-4-6 Landau-Ginzburg-Devonshire (LGD) thermodynamic approach. By using phenomenological parameters of the LGD potential for a bulk antiferroelectric and a Stephenson-Highland (SH) approach, we study the role of surface ions with a charge density proportional to the relative partial oxygen pressure on the dipole states and their reversal mechanisms in antiferroelectric thin films. The combined LGDSH approach allows the boundaries of antiferroelectric, ferroelectriclike antiferroionic, and electretlike paraelectric states as a function of temperature, oxygen pressure, surface-ion formation energy and concentration, and film thickness to be delineated. This approach also allows the characterization of the polar and antipolar orderings dependence on the voltage applied to the antiferroelectric film, as well as the analysis of their static and dynamic hysteresis loops. The applications of the antiferroelectric films covered with a surface-ion layer for energy and information storage are explored and discussed.
| Original language | English |
|---|---|
| Article number | 044053 |
| Journal | Physical Review Applied |
| Volume | 16 |
| Issue number | 4 |
| DOIs | |
| State | Published - Oct 2021 |
Funding
U.S. Department of Energy National Academy of Sciences of Ukraine The authors are very grateful to Dr. Bobby Sampter and the referees for very useful remarks and stimulating discussions. This effort is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences Energy Frontier Research Centers program under Award No. DE-SC0021118 (S.V.K.) and performed at the Oak Ridge National Laboratory’s Center for Nanophase Materials Sciences (CNMS), a U.S. Department of Energy, Office of Science User Facility. Work by A.N.M. and N.V.M. is supported by the National Academy of Sciences of Ukraine. This work is supported, in part (A.B.), by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, as part of the Energy Frontier Research Centers program, Center for the Science of Synthesis Across Scales (CSSAS), under Award No. DE-SC0019288, located at the University of Washington and performed at Oak Ridge National Laboratory’s Center for Nanophase Materials Sciences (CNMS), a U.S. Department of Energy, Office of Science User Facility. Work by A.N.M is supported by the National Research Foundation of Ukraine (Grant No.Φ81/41481). This work has been partially supported by U.S. DOE Grant No. DE-FG02-13ER41967. ORNL is managed by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 for the U.S. Department of Energy.