Epitaxial integration of improper ferroelectric hexagonal YMnO3 thin films in heterostructures
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2020-12
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Journal Article
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Abstract
We report on multiple fundamental qualitative improvements in the growth of improper ferroelectric hexagonal YMnO3 (YMO) thin films and heterostructures by pulsed laser deposition (PLD). By a combination of pre-growth substrate annealing and low-energy-fluence PLD, we obtain a two-dimensional growth mode of the YMO films on yttria-stabilized zirconia (YSZ) with ultralow roughness and devoid of misoriented nanocrystalline inclusions. By inserting a hexagonal manganite buffer layer capped with conducting indium-tin oxide between the substrate and the final film, the latter is grown in a fully lattice-relaxed mode and, thus, without any misfit dislocations while maintaining the extraordinary flatness of the films grown directly on pre-annealed YSZ. This provides a template for the fabrication of heterostructures based on hexagonal manganites as a promising class of multiferroics with improper room-temperature ferroelectricity and the implementation of these into technologically relevant epitaxial metal ferroelectric-type multilayers.
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published
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4 (12)
Pages / Article No.
124403
Publisher
American Physical Society
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03918 - Fiebig, Manfred / Fiebig, Manfred
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694955 - In-situ second harmonic generation for emergent electronics in transition-metal oxides (EC)
188414 - Multifunctional oxide electronics using natural ferroelectric superlattices (SNF)
188414 - Multifunctional oxide electronics using natural ferroelectric superlattices (SNF)