Effects of electrodes and space charges on the tunneling electroresistance in the ferroelectric tunnel junction with a SrTiO3/BaTiO3 composite barrier

被引：19

作者：

Wu, Yin-Zhong ^{[1
,2
,3
]}

Ju, Sheng ^{[2
]}

Li, Zhen-Ya ^{[2
]}

机构：

[1] Changshu Inst Technol, Jiangsu Lab Adv Funct Mat, Changshu 215500, Peoples R China

[2] Soochow Univ, Dept Phys, Suzhou 215006, Peoples R China

[3] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 25期

基金：

美国国家科学基金会;

关键词：

ab initio calculations; barium compounds; composite materials; dielectric polarisation; electrodes; ferroelectric thin films; quantum theory; space charge; strontium compounds; tunnelling;

D O I：

10.1063/1.3457451

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Using the lattice model for strained nanoscale ferroelectric films and quantum tunneling theory, we present a theoretical investigation of tunneling electroresistance (TER) in the ferroelectric tunnel junction (FTJ) with a SrTiO3/BaTiO3 composite barrier. The exact profile of local polarizations within the composite barrier is calculated from first principles. It is found that the TER will sensitively depend on the choice of electrode with the increase in SrTiO3 barrier's thickness. The space charges, which exist at the interface between the two barriers, will enhance the TER, and provide an effective approach to achieving large TER in FTJs. (C) 2010 American Institute of Physics. [doi:10.1063/1.3457451]

引用

页数：3

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