Ge, Wanbing, Beanland, Richard, Alexe, Marin, Ramasse, Quentin and Sánchez, Ana M. (2023) 180° head-to-head flat domain walls in single crystal BiFeO3. Microstructures . ISSN 2770-2995. (In Press)

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Abstract

We investigate flux-grown BiFeO3 crystals using transmission electron microscopy. This material has an intriguing ferroelectric structure of domain walls with a period of ~100 nm, alternating between flat and sawtooth morphologies. We show that all domain walls are of 180° type and that the flat walls, lying on (112) planes, are reconstructed with an excess of Fe and deficiency of Bi. This reconstruction is similar to that observed in several previous studies of deposited layers of BiFeO3. The negative charge of the reconstructed layer induces head-to-head polarisation in the surrounding material, as well as a rigid-body shift of one domain relative to the other. These characteristics pin the flat 180° domain walls, as well as determining the domain structure of the material. Sawtooth 180° domain walls provide the necessary reversal of polarization between flat walls. The high density of immobile domain walls suppresses the ferroelectric properties of the material, highlighting the need for careful control of growth conditions.

Item Type:	Journal Article
Alternative Title:
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title:	Microstructures
Publisher:	OAE Publishing Inc.
ISSN:	2770-2995
Official Date:	2023
Dates:	Date Event 2023 Available 2023 Accepted 30 April 2023 Submitted
Status:	Peer Reviewed
Publication Status:	In Press
Reuse Statement (publisher, data, author rights):	This is the pre-peer reviewed version of the following article: [FULL CITE], which has been published in final form at [Link to final article using the DOI]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	10 May 2023
Date of first compliant Open Access:	10 May 2023
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID EP/R513374/1 [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266
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