Engineering of a charged incoherent BiFeO3/SrTiO3 interface
Source abstract
Abstract
Atomic-level control of complex oxide heterostructure interfaces has resulted in unprecedented properties and functionalities. The majority of oxide heterointerfaces being intensively investigated maintain lattice coherence and exhibit a flawless epitaxial alignment between the films and the substrates. Here, we report the engineering of a charged incoherent BiFeO3/SrTiO3 interface using a tailored deposition sequence in reactive oxide molecular beam epitaxy. By introducing an additional iron oxide layer to disrupt the lattice coherence at the interface, the overlying BiFeO3 is stabilized in a tetragonal phase with its enhanced ferroelectric polarization pointing toward the SrTiO3 substrate, which drives free electrons to accumulate at the incoherent interface. Our findings reveal how controlling lattice coherence at oxide heterointerfaces can open new avenues for fabricating artificial oxide heterostructures with unique properties through precise interface engineering.
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Research context
OpenAlex topics: Electronic and Structural Properties of Oxides · Ferroelectric and Piezoelectric Materials · Multiferroics and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Applied Physics, The Hong Kong Polytechnic University 1 , Hung Hom, Hong Kong, China
School of Physics, Sun Yat-Sen University 2 , Guangzhou 510275, China
National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Science and Collaborative Innovation Center of Advanced Microstructures, Nanjing University 3 , Nanjing 210093, China
Department of Physics, University of Warwick 4 , Coventry CV4 7AL, United Kingdom
Department of Materials Science and Engineering, Department of Physics and Astronomy, University of California 5 , Irvine, California 92697, USA
Funding
Hong Kong Polytechnic University · Research Grants Council, University Grants Committee · National Natural Science Foundation of China
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