Highly Responsive Polar Vortices in All-Ferroelectric Heterostructures

Kavle, P and Ross, AM and Harikrishnan, KP and Meisenheimer, P and Dasgupta, A and Yang, J and Lin, C-C and Pan, H and Behera, P and Parsonnet, E and Huang, X and Zorn, JA and Shao, Y-T and Das, S and Liu, S and Muller, DA and Ramesh, R and Chen, L-Q and Martin, LW (2024) Highly Responsive Polar Vortices in All-Ferroelectric Heterostructures. In: Advanced Materials .

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Abstract

The discovery of polar vortices and skyrmions in ferroelectric-dielectric superlattices such as (PbTiO3)n/(SrTiO3)n has ushered in an era of novel dipolar topologies and corresponding emergent phenomena. The key to creating such emergent features has generally been considered to be related to counterpoising strongly polar and non-polar materials thus creating the appropriate boundary conditions. This limits the utility these materials can have, however, by rendering (effectively) half of the structure unresponsive to applied stimuli. Here, using advanced thin-film deposition and an array of characterization and simulation approaches, polar vortices are realized in all-ferroelectric trilayers, multilayers, and superlattices built from the fundamental building block of (PbTiO3)n/(PbxSr1�xTiO3)n wherein in-plane ferroelectric polarization in the PbxSr1�xTiO3 provides the appropriate boundary conditions. These superlattices exhibit substantially enhanced electromechanical and ferroelectric responses in the out-of-plane direction that arise from the ability of the polarization in both layers to rotate to the out-of-plane direction under field. In the in-plane direction, the layers are found to be strongly coupled during switching and when heterostructured with ferroelectric-dielectric building blocks, it is possible to produce multistate switching. This approach expands the realm of systems supporting emergent dipolar texture formation and does so with entirely ferroelectric materials thus greatly improving their responses. © 2024 Wiley-VCH GmbH.

Item Type:	Journal Article
Publication:	Advanced Materials
Publisher:	John Wiley and Sons Inc
Additional Information:	The copyright for this article belongs to John Wiley and Sons Inc
Keywords:	Ferroelectric devices; Ferroelectric thin films; Hard facing; Layered semiconductors; Lead titanate; Liquid crystals; Multilayer films; Multilayers; Single crystals; Strontium compounds; Superlattices, Condition; Dipolar texture; Ferroelectric vortex; Ferroelectrics dielectrics; In-plane ferroelectric; Multi-state; PbTiO 3; Polar vortex; Thin-film superlattix; Thin-films, Ferroelectricity
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	27 Nov 2024 11:50
Last Modified:	27 Nov 2024 11:50
URI:	http://eprints.iisc.ac.in/id/eprint/86956

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