Domain-wall pinning and defect ordering in BiFeO3 probed on the atomic and nanoscale

Andreja Bencan, Goran Drazic, Hana Ursic, Maja Makarovic, Matej Komelj and Tadej Rojac ()
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Andreja Bencan: Jozef Stefan Institute
Goran Drazic: Jozef Stefan International Postgraduate School
Hana Ursic: Jozef Stefan Institute
Maja Makarovic: Jozef Stefan Institute
Matej Komelj: Jozef Stefan Institute
Tadej Rojac: Jozef Stefan Institute

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Electro-mechanical interactions between charged point defects and domain walls play a key role in the functional properties of bulk and thin-film ferroelectrics. While for perovskites the macroscopic implications of the ordering degree of defects on domain-wall pinning have been reported, atomistic details of these mechanisms remain unclear. Here, based on atomic and nanoscale analyses, we propose a pinning mechanism associated with conductive domain walls in BiFeO3, whose origin lies in the dynamic coupling of the p-type defects gathered in the domain-wall regions with domain-wall displacements under applied electric field. Moreover, we confirm that the degree of defect ordering at the walls, which affect the domain-wall conductivity, can be tuned by the cooling rate used during the annealing, allowing us to determine how this ordering affects the atomic structure of the walls. The results are useful in the design of the domain-wall architecture and dynamics for emerging nanoelectronic and bulk applications.

Date: 2020
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DOI: 10.1038/s41467-020-15595-0

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