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Flexocoupling impact on the kinetics of polarization reversal

Vorotiahin, Ivan S. and Morozovska, Anna N. and Eliseev, Eugene A. and Genenko, Yuri A. (2017):
Flexocoupling impact on the kinetics of polarization reversal.
In: Physical Review B, pp. 014104 (1, 95, (1), ISSN 2469-9950,
[Online-Edition: http://doi.org/10.1103/PhysRevB.95.014104],
[Article]

Abstract

The impact of flexoelectric coupling on polarization reversal and space-charge variation in thin films of ferroelectric semiconductors has been studied theoretically. The relaxation-type Landau-Khalatnikov equation together with the Poisson equation and the theory of elasticity equations have been used to calculate in a self-consistentway the spatial-temporal development of ferroelectric polarization, electric potential, space charge, elastic stresses and strains. The analysis of the obtained results reveals a moderate increase in the flexocoupling influence on the polarization, elastic strain, electric potential, and space-charge development with a decrease in the ferroelectric film thickness. In contrast, the dependence of polarization switching time on the applied electric field is remarkably affected by the flexocoupling strength. The polarization reversal process consists typically of two stages; the first stage has no characteristic time, whereas the second one exhibits a switching time strongly dependent on the applied electric field.

Item Type: Article
Erschienen: 2017
Creators: Vorotiahin, Ivan S. and Morozovska, Anna N. and Eliseev, Eugene A. and Genenko, Yuri A.
Title: Flexocoupling impact on the kinetics of polarization reversal
Language: English
Abstract:

The impact of flexoelectric coupling on polarization reversal and space-charge variation in thin films of ferroelectric semiconductors has been studied theoretically. The relaxation-type Landau-Khalatnikov equation together with the Poisson equation and the theory of elasticity equations have been used to calculate in a self-consistentway the spatial-temporal development of ferroelectric polarization, electric potential, space charge, elastic stresses and strains. The analysis of the obtained results reveals a moderate increase in the flexocoupling influence on the polarization, elastic strain, electric potential, and space-charge development with a decrease in the ferroelectric film thickness. In contrast, the dependence of polarization switching time on the applied electric field is remarkably affected by the flexocoupling strength. The polarization reversal process consists typically of two stages; the first stage has no characteristic time, whereas the second one exhibits a switching time strongly dependent on the applied electric field.

Journal or Publication Title: Physical Review B
Volume: 95
Number: 1
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 24 Mar 2017 12:21
Official URL: http://doi.org/10.1103/PhysRevB.95.014104
Identification Number: doi:10.1103/PhysRevB.95.014104
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