Dislocation-tuned ferroelectricity and ferromagnetism of the BiFeO3/SrRuO3 interface

Misfit dislocations at a heteroepitaxial interface produce huge strain and, thus, have a significant impact on the properties of the interface. Here, we use scanning transmission electron microscopy to demonstrate a quantitative unit-cell-by-unit-cell mapping of the lattice parameters and octahedral...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2023-03, Vol.120 (13), p.e2213650120-e2213650120
Main Authors: Li, Xiaomei, Han, Bo, Zhu, Ruixue, Shi, Ruochen, Wu, Mei, Sun, Yuanwei, Li, Yuehui, Liu, Bingyao, Wang, Lifen, Zhang, Jingmin, Tan, Congbing, Gao, Peng, Bai, Xuedong
Format: Article
Language:English
Subjects:
Dipoles
Dislocation
Electromagnetic coupling
Electrons
Ferroelectric materials
Ferroelectricity
Ferromagnetism
Heterostructures
Lattice parameters
Magnetic moments
Misfit dislocations
Order parameters
Physical Sciences
Scanning transmission electron microscopy
Thin films
Transmission electron microscopy
Unit cell
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Summary:Misfit dislocations at a heteroepitaxial interface produce huge strain and, thus, have a significant impact on the properties of the interface. Here, we use scanning transmission electron microscopy to demonstrate a quantitative unit-cell-by-unit-cell mapping of the lattice parameters and octahedral rotations around misfit dislocations at the BiFeO3/SrRuO3 interface. We find that huge strain field is achieved near dislocations, i.e., above 5% within the first three unit cells of the core, which is typically larger than that achieved from the regular epitaxy thin-film approach, thus significantly altering the magnitude and direction of the local ferroelectric dipole in BiFeO3 and magnetic moments in SrRuO3 near the interface. The strain field and, thus, the structural distortion can be further tuned by the dislocation type. Our atomic-scale study helps us to understand the effects of dislocations in this ferroelectricity/ferromagnetism heterostructure. Such defect engineering allows us to tune the local ferroelectric and ferromagnetic order parameters and the interface electromagnetic coupling, providing new opportunities to design nanosized electronic and spintronic devices.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.2213650120