Atomically Resolved Electronic States and Correlated Magnetic Order at Termination Engineered Complex Oxide Heterointerfaces

Bo-Chao Huang; Pu Yu; Y H Chu; Chia-Seng Chang; Ramamoorthy Ramesh; Rafal E Dunin-Borkowski; Philipp Ebert; Ya-Ping Chiu

doi:10.1021/acsnano.7b06004

Atomically Resolved Electronic States and Correlated Magnetic Order at Termination Engineered Complex Oxide Heterointerfaces

ACS Nano. 2018 Feb 27;12(2):1089-1095. doi: 10.1021/acsnano.7b06004. Epub 2018 Jan 31.

Authors

Bo-Chao Huang^{1

2}, Pu Yu^{3

4}, Y H Chu^{2

5}, Chia-Seng Chang², Ramamoorthy Ramesh⁶, Rafal E Dunin-Borkowski⁷, Philipp Ebert⁷, Ya-Ping Chiu^{1

2}

Affiliations

¹ Department of Physics, National Taiwan University , Taipei 106, Taiwan.
² Institute of Physics, Academia Sinica , Taipei 105, Taiwan.
³ State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, and Collaborative Innovation Center of Quantum Matter , Beijing 100084, China.
⁴ RIKEN Center for Emergent Matter Science (CEMS) , Wako, Saitama 351-0198, Japan.
⁵ Department of Materials Science and Engineering, National Chiao Tung University , Hsinchu 300, Taiwan.
⁶ Department of Physics, University of California , Berkeley, California 94720, United States.
⁷ Peter Grünberg Institut, Forschungszentrum Jülich GmbH , 52425 Jülich, Germany.

PMID: 29384356
DOI: 10.1021/acsnano.7b06004

Abstract

We map electronic states, band gaps, and interface-bound charges at termination-engineered BiFeO₃/La_0.7Sr_0.3MnO₃ interfaces using atomically resolved cross-sectional scanning tunneling microscopy. We identify a delicate interplay of different correlated physical effects and relate these to the ferroelectric and magnetic interface properties tuned by engineering the atomic layer stacking sequence at the interfaces. This study highlights the importance of a direct atomically resolved access to electronic interface states for understanding the intriguing interface properties in complex oxides.

Keywords: BiFeO3; La0.7Sr0.3MnO3; atomically resolved electronic states; complex oxide heterointerfaces; cross-sectional scanning tunneling microscopy.

Publication types

Research Support, Non-U.S. Gov't