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Observation of Hidden Polar Phases and Flux Closure Domain Topology in Bi2WO6 Thin Films

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Title
Observation of Hidden Polar Phases and Flux Closure Domain Topology in Bi2WO6 Thin Films
Author(s)
Kwon, Yong-Jun; Yeo, Youngki; Kim, Min-Su; Kim, Yong-Jin; Park, Heung-Sik; Kim, Jaegyu; Si-Young Choi; Yang, Chan-Ho
Publication Date
2023-05
Journal
NANO LETTERS, v.23, no.10, pp.4557 - 4563
Publisher
AMER CHEMICAL SOC
Abstract
Topological textures of ferroelectric polarizations have promise as alternative devices for future information technology. A polarization rotation inevitably deviates from the stable orientation in axial ferroelectrics, but local energy losses compromise the global symmetry, resulting in a distorted shape of the topological vortex or inhibiting the vortex. Easy planar isotropy helps to promote rotating structures and, accordingly, to facilitate access to nontrivial textures. Here, we investigate the domain structure of an epitaxial thin film of bismuth tungsten oxide (Bi2WO6) grown on a (001) SrTiO3 substrate. By using angle resolved piezoresponse force microscopy and scanning transmission electron microscopy, we find the existence of a hidden phase with (100)-oriented ferroelectric polarizations in the middle of the four variant (110)-oriented polarization domains, which assists in the formation of flux closure domains. The results suggest that this material is one step closer to becoming an isotropic twodimensional polar material.
URI
https://pr.ibs.re.kr/handle/8788114/13729
DOI
10.1021/acs.nanolett.3c01009
ISSN
1530-6984
Appears in Collections:
Center for Van der Waals Quantum Solids(반데르발스 양자 물질 연구단) > 1. Journal Papers (저널논문)
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