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Enhanced tunneling electroresistance effect in composite ferroelectric tunnel junctions with asymmetric electrodes

Published online by Cambridge University Press:  08 November 2018

Z.J. Ma ,
L.Q. Li ,
K. Liang ,
T.J. Zhang ,
N. Valanoor ,
H.P. Wu ,
Y.Y. Wang  and
X.Y. Liu
Z.J. Ma
Affiliation:
Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, People's Republic of China
L.Q. Li
Affiliation:
Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, People's Republic of China
K. Liang
Affiliation:
Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, People's Republic of China
T.J. Zhang*
Affiliation:
Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, People's Republic of China
N. Valanoor*
Affiliation:
School of Materials Science and Engineering, University of New South Wales (UNSW), Sydney 2052, Australia
H.P. Wu
Affiliation:
Zhejiang University of Technology, Ministry of Education and Zhejiang Province, Key Laboratory of E&M, Hangzhou 310014, People's Republic of China
Y.Y. Wang
Affiliation:
Zhejiang University of Technology, Ministry of Education and Zhejiang Province, Key Laboratory of E&M, Hangzhou 310014, People's Republic of China
X.Y. Liu
Affiliation:
College of Metallurgy and Materials Engineering, Chongqing Key Laboratory of Nano/Micro Composites and Devices, Chongqing University of Science and Technology, Chongqing 401331, People's Republic of China
*
Address all correspondence to T.J. Zhang at [email protected]; N. Valanoor at [email protected]
Address all correspondence to T.J. Zhang at [email protected]; N. Valanoor at [email protected]
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Abstract

Theoretical investigations on ferroelectric tunnel junctions (FTJs) with asymmetric electrodes and a composite barrier are presented. A large tunneling electroresistance effect exists for the Pt/SrTiO3/BaTiO3/SrRuO3 junction; on the other hand, exchange of the dielectric and ferroelectric layer stacking sequence can seriously degrade the performance. These correlations are rationalized by the proposed concept of an asymmetry factor, defined as the ratio between the average barrier heights of FTJs for two opposite polarization orientations. We show that a large asymmetry factor is beneficial to FTJs. This work may provide a way to enhance the performance of FTJs by structure engineering.

Type
Research Letters
Information
MRS Communications , Volume 9 , Issue 1 , March 2019 , pp. 258 - 263
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

*

This author was an editor of this journal during the review and decision stage. For the MRS policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/editor-manuscripts.

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