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Dislocation-tuned ferroelectricity and ferromagnetism of the BiFeO(3)/SrRuO(3) 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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Detalles Bibliográficos
Autores principales: 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
Formato: Online Artículo Texto
Lenguaje:English
Publicado: National Academy of Sciences 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10068816/
https://www.ncbi.nlm.nih.gov/pubmed/36940334
http://dx.doi.org/10.1073/pnas.2213650120
Descripción
Sumario: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 BiFeO(3)/SrRuO(3) 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 BiFeO(3) and magnetic moments in SrRuO(3) 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.