Non-volatile electric-field control of inversion symmetry

Caretta, Lucas; Shao, Yu‐Tsun; Jia, Yu; Mei, Antonio B.; Grosso, Bastien F.; Dai, Cheng; Behera, Piush; Lee, Dae Hun; McCarter, Margaret R.; Parsonnet, Eric; Harikrishnan, K. P.; Xue, Fei; Guo, Xiangwei; Barnard, Edward S.; Ganschow, Steffen; Hong, Zijian; Raja, Archana; Martin, Lane W.; Chen, Lei; Fiebig, Manfred; Lai, Keji; Spaldin, Nicola A.; Muller, David A.; Schlom, D. G.; Ramesh, R.

doi:10.1038/s41563-022-01412-0

Cited by 18 publications

(7 citation statements)

References 65 publications

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“…4 ). The final polarization state results from the superposition of the nearly homogeneous polarization featured by isolated freestanding layers and the vortex-like modulation of the local ferroelectric potential imposed by the interface, yielding a peculiar 2D pattern of polarization waves 7 . The polarization ( P − ⟨ P ⟩) maps in Fig.…”

Section: Strain and Polarization Analysis Of Twisted Bilayersmentioning

confidence: 99%

A 2D ferroelectric vortex pattern in twisted BaTiO3 freestanding layers

Sánchez-Santolino,

Rouco,

Puebla

et al. 2024

Nature

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The wealth of complex polar topologies1–10 recently found in nanoscale ferroelectrics results from a delicate balance between the intrinsic tendency of the materials to develop a homogeneous polarization and the electric and mechanical boundary conditions imposed on them. Ferroelectric–dielectric interfaces are model systems in which polarization curling originates from open circuit-like electric boundary conditions, to avoid the build-up of polarization charges through the formation of flux-closure11–14 domains that evolve into vortex-like structures at the nanoscale15–17 level. Although ferroelectricity is known to couple strongly with strain (both homogeneous18 and inhomogeneous19,20), the effect of mechanical constraints21 on thin-film nanoscale ferroelectrics has been comparatively less explored because of the relative paucity of strain patterns that can be implemented experimentally. Here we show that the stacking of freestanding ferroelectric perovskite layers with controlled twist angles provides an opportunity to tailor these topological nanostructures in a way determined by the lateral strain modulation associated with the twisting. Furthermore, we find that a peculiar pattern of polarization vortices and antivortices emerges from the flexoelectric coupling of polarization to strain gradients. This finding provides opportunities to create two-dimensional high-density vortex crystals that would enable us to explore previously unknown physical effects and functionalities.

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Section: Strain and Polarization Analysis Of Twisted Bilayersmentioning

confidence: 99%

A 2D ferroelectric vortex pattern in twisted BaTiO3 freestanding layers

Sánchez-Santolino,

Rouco,

Puebla

et al. 2024

Nature

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“…Ideally one would start with a multiferroic crystal such as BiFeO 3 and impose the same set of boundary conditions, as in the case of the PbTiO 3 =SrTiO 3 superlattices, i.e., electrostatic and elastic boundary conditions to manipulate the polar state. Studies to date have shown that when such boundary conditions are imposed on BiFeO 3 , it begins to transform into one of these phases, specifically the antipolar, orthorhombic structure, which then coexists with the polar R3c structure (or a distorted version of the polar phase) as a nanoscale ensemble that can be interconverted between each phase with an electric field (Zeches et al, 2009;He et al, 2011;Caretta et al, 2023). Thus, there is an opportunity to create coupled polar and spin textures if the issue of octahedral tilt is resolved.…”

Section: Coupling Topological Patterns With Spin: Toward Multiferroic...mentioning

confidence: 99%

Topological phases in polar oxide nanostructures

et al. 2023

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The past decade has witnessed dramatic progress related to various aspects of emergent topological polar textures in oxide nanostructures displaying vortices, skyrmions, merons, hopfions, dipolar waves, or labyrinthine domains, among others. For a long time, these nontrivial structures (the electric counterparts of the exotic spin textures) were not expected due to the high energy cost associated with the dipolar anisotropy: the smooth and continuous evolution of the local polarization to produce

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“…Apart from the emergent antiferroelectricity in para-and ferro-electric materials, the AFE behavior can also be derived from multiferroic BiFeO 3 nanolayers with delicate interface engineering. This is evidenced by identification of antipolar phases in BiFeO 3 / La 0.7 Sr 0.3 MnO 3 , BiFeO 3 /La 0.4 Bi 0.6 FeO 3 , and BiFeO 3 /TbScO 3 superlattices [186][187][188][189]. These studies demonstrate that interfacial control offers an effective strategy for the design of new AFE materials for versatile applications.…”

Section: Superlattice and Interface Controlmentioning

confidence: 73%

Antiferroelectric oxide thin-films: Fundamentals, properties, and applications

Si,

Zhang,

Liu

et al. 2024

Progress in Materials Science

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Non-volatile electric-field control of inversion symmetry

Cited by 18 publications

References 65 publications

A 2D ferroelectric vortex pattern in twisted BaTiO3 freestanding layers

A 2D ferroelectric vortex pattern in twisted BaTiO3 freestanding layers

Topological phases in polar oxide nanostructures

Antiferroelectric oxide thin-films: Fundamentals, properties, and applications

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