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Title: Tunable electronic and magnetism of SrTiO{sub 3}/BiFeO{sub 3} (001) superlattice: For electrochemical applications

Abstract

Practical strategy in tuning the conductivity and magnetism of SrTiO{sub 3}/BiFeO{sub 3} (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 TiO{sub 2}/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.

Authors:
; ; ; ;  [1]; ;  [2]
  1. Entropic Interface Group (EIG), Engineering Product Development, Singapore University of Technology and Design (SUTD), 8 Somapah Road, Singapore 487372 (Singapore)
  2. Institute of High Performance Computing (IHPC), Agency for Science, Technology and Research - A*Star, 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632 (Singapore)
Publication Date:
OSTI Identifier:
22489230
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 1; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CARRIERS; DENSITY FUNCTIONAL METHOD; ELECTROCHEMISTRY; ELECTRONIC STRUCTURE; INTERFACES; LAYERS; MAGNETIC FIELDS; MAGNETISM; SOLAR CELLS; STRONTIUM TITANATES; SUPERLATTICES; THICKNESS; THIN FILMS; TITANIUM OXIDES; TUNING

Citation Formats

Xu, Qiang, Sopiha, Kostiantyn, Sobhan, Mushtaq, Anariba, Franklin, Wu, Ping, Ong, Khuong Phuong, and Zheng, Jian Wei. Tunable electronic and magnetism of SrTiO{sub 3}/BiFeO{sub 3} (001) superlattice: For electrochemical applications. United States: N. p., 2016. Web. doi:10.1063/1.4939438.
Xu, Qiang, Sopiha, Kostiantyn, Sobhan, Mushtaq, Anariba, Franklin, Wu, Ping, Ong, Khuong Phuong, & Zheng, Jian Wei. Tunable electronic and magnetism of SrTiO{sub 3}/BiFeO{sub 3} (001) superlattice: For electrochemical applications. United States. https://doi.org/10.1063/1.4939438
Xu, Qiang, Sopiha, Kostiantyn, Sobhan, Mushtaq, Anariba, Franklin, Wu, Ping, Ong, Khuong Phuong, and Zheng, Jian Wei. 2016. "Tunable electronic and magnetism of SrTiO{sub 3}/BiFeO{sub 3} (001) superlattice: For electrochemical applications". United States. https://doi.org/10.1063/1.4939438.
@article{osti_22489230,
title = {Tunable electronic and magnetism of SrTiO{sub 3}/BiFeO{sub 3} (001) superlattice: For electrochemical applications},
author = {Xu, Qiang and Sopiha, Kostiantyn and Sobhan, Mushtaq and Anariba, Franklin and Wu, Ping and Ong, Khuong Phuong and Zheng, Jian Wei},
abstractNote = {Practical strategy in tuning the conductivity and magnetism of SrTiO{sub 3}/BiFeO{sub 3} (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 TiO{sub 2}/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.},
doi = {10.1063/1.4939438},
url = {https://www.osti.gov/biblio/22489230}, journal = {Applied Physics Letters},
issn = {0003-6951},
number = 1,
volume = 108,
place = {United States},
year = {Mon Jan 04 00:00:00 EST 2016},
month = {Mon Jan 04 00:00:00 EST 2016}
}