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Tuning of polarization, internal electric field, and hysteresis loop behaviours in BaTiO3/BaxSr1-xTiO3 superlattices

Tuning of polarization, internal electric field, and hysteresis loop behaviours in BaTiO3/BaxSr1-xTiO3 superlattices
Tuning of polarization, internal electric field, and hysteresis loop behaviours in BaTiO3/BaxSr1-xTiO3 superlattices
A thermodynamic model based on the Landau-Ginzburg theory is developed to study the polarization and hysteresis loop behaviors in ferroelectric superlattices with technologically important BaxSr1-xTiO3 (BST) solid solutions. Our study shows that the polarization, coercive field, and hysteresis loop behaviors can be tailored by changing the thickness ratio and the Ba/Sr content of BST. The study also found that the sign of the internal fields depends sensitively on both thickness ratio and Ba/Sr content of BST. Both results imply that the internal electric field of superlattice can be tuned to yield zero polarizing or depolarizing field via manipulation of thickness ratio and composition. These findings could pave the way to enhance the efficiency of ferroelectric photovoltaic devices by manipulating the internal electric field through thickness and composition.
0021-8979
104101
Lim, Kok-Geng
927dad30-b19f-4376-8650-cdb1cbdd29b1
Chew, Khian-Hooi
be75ce91-e858-4dd1-9b63-7f42fb17593e
Lim, Kok-Geng
927dad30-b19f-4376-8650-cdb1cbdd29b1
Chew, Khian-Hooi
be75ce91-e858-4dd1-9b63-7f42fb17593e

Lim, Kok-Geng and Chew, Khian-Hooi (2018) Tuning of polarization, internal electric field, and hysteresis loop behaviours in BaTiO3/BaxSr1-xTiO3 superlattices. Journal of Applied Physics, 123 (10), 104101. (doi:10.1063/1.5012130).

Record type: Article

Abstract

A thermodynamic model based on the Landau-Ginzburg theory is developed to study the polarization and hysteresis loop behaviors in ferroelectric superlattices with technologically important BaxSr1-xTiO3 (BST) solid solutions. Our study shows that the polarization, coercive field, and hysteresis loop behaviors can be tailored by changing the thickness ratio and the Ba/Sr content of BST. The study also found that the sign of the internal fields depends sensitively on both thickness ratio and Ba/Sr content of BST. Both results imply that the internal electric field of superlattice can be tuned to yield zero polarizing or depolarizing field via manipulation of thickness ratio and composition. These findings could pave the way to enhance the efficiency of ferroelectric photovoltaic devices by manipulating the internal electric field through thickness and composition.

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More information

Accepted/In Press date: 22 February 2018
e-pub ahead of print date: 9 March 2018
Published date: 14 March 2018

Identifiers

Local EPrints ID: 422940
URI: http://eprints.soton.ac.uk/id/eprint/422940
ISSN: 0021-8979
PURE UUID: a17d7438-357f-417b-b50e-3bb995a7dfeb

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Date deposited: 08 Aug 2018 16:30
Last modified: 15 Mar 2024 21:09

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Contributors

Author: Kok-Geng Lim
Author: Khian-Hooi Chew

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