超晶格
磁性
材料科学
凝聚态物理
电导率
薄膜
电子结构
光电子学
纳米技术
化学
物理化学
物理
作者
Qiang Xu,Kostiantyn V. Sopiha,Mushtaq A. Sobhan,Franklin Anariba,Khuong P. Ong,Jian Zheng,Ping Wu
摘要
Practical strategy in tuning the conductivity and magnetism of SrTiO3/BiFeO3 (STO/BFO) (001) superlattice is investigated using the first-principles method based on density functional theory. Our calculated results show that both the conductivity and magnetism of this superlattice can be tuned via a control of its interface terminations. The STO layers maintain semiconducting, while the BFO layers demonstrate metallic character. Therefore, the conductivity of STO/BFO is controlled by the BFO layers. Furthermore, a magnetic STO/BFO (001) superlattice can be found in n-type TiO2/BiO interface but with heavy electron carriers. The thickness of BFO does not change the electronic structure and character of STO/BFO (001) superlattice. This study provides a fundamental understanding of the chemically turned conductivity and magnetism of BFO thin films, which may further advance electrochemical applications like magnetic-field aided chemical gas sensing, solar cells, and photo-catalytic chemical reactions.
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