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Thick does the trick: genesis of ferroelectricity in 2D GeTe-rich (GeTe).sub.m./sub.(Sb.sub.2./sub.Te.sub.3./sub.).sub.n./sub. lamellae
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SYSNO ASEP 0585018 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Thick does the trick: genesis of ferroelectricity in 2D GeTe-rich (GeTe)m(Sb2Te3)n lamellae Author(s) Cecchi, S. (IT)
Momand, J. (NL)
Dragoni, D. (IT)
Abou El Kheir, O. (IT)
Fagiani, F. (IT)
Kriegner, Dominik (FZU-D) ORCID, RID
Rinaldi, C. (IT)
Arciprete, F. (IT)
Holý, V. (CZ)
Kooi, B.J. (NL)
Bernasconi, M. (IT)
Calarco, R. (DE)Number of authors 12 Article number 2304785 Source Title Advanced Science. - : Wiley
Roč. 11, č. 1 (2024)Number of pages 11 s. Language eng - English Country US - United States Keywords 2D ferroelectrics ; van der Waals ; molecular beam epitaxy ; phase-change materials ; density functional theory calculations Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects GM22-22000M GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 001108011600001 EID SCOPUS 85177180181 DOI 10.1002/advs.202304785 Annotation The possibility to engineer (GeTe)m(Sb2Te3)n phase-change materials to co-host ferroelectricity is extremely attractive. The combination of these functionalities holds great technological impact, potentially enabling the design of novel multifunctional devices. Here an experimental and theoretical study of epitaxial (GeTe)m(Sb2Te3)n with GeTe-rich composition is presented. These layered films feature a tunable distribution of (GeTe)m(Sb2Te3)1 blocks of different sizes. Breakthrough evidence of ferroelectric displacement in thick (GeTe)m(Sb2Te3)1 lamellae is provided. The density functional theory calculations suggest the formation of a tilted (GeTe)m slab sandwiched in GeTe-rich blocks. That is, the net ferroelectric polarization is confined almost in-plane, representing an unprecedented case between 2D and bulk ferroelectric materials. The ferroelectric behavior is confirmed by piezoresponse force microscopy and electroresistive measurements. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2025 Electronic address https://hdl.handle.net/11104/0352787
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