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Article

Polarization and Dielectric Properties of BiFeO3-BaTiO3 Superlattice-Structured Ferroelectric Films

by 1,* and 2,*
1
Division of Information and Energy, Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
2
International Research Organization for Advanced Science & Technology (IROAST), Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
*
Authors to whom correspondence should be addressed.
Academic Editor: Dong-Joo Kim
Nanomaterials 2021, 11(7), 1857; https://doi.org/10.3390/nano11071857
Received: 21 June 2021 / Revised: 9 July 2021 / Accepted: 16 July 2021 / Published: 19 July 2021
(This article belongs to the Special Issue Pulsed Laser Deposited Nanostructures)
Superlattice-structured epitaxial thin films composed of Mn(5%)-doped BiFeO3 and BaTiO3 with a total thickness of 600 perovskite (ABO3) unit cells were grown on single-crystal SrTiO3 substrates by pulsed laser deposition, and their polarization and dielectric properties were investigated. When the layers of Mn-BiFeO3 and BaTiO3 have over 25 ABO3 unit cells (N), the superlattice can be regarded as a simple series connection of their individual capacitors. The superlattices with an N of 5 or less behave as a unified ferroelectric, where the BaTiO3 and Mn-BiFeO3 layers are structurally and electronically coupled. Density functional theory calculations can explain the behavior of spontaneous polarization for the superlattices in this thin regime. We propose that a superlattice formation comprising two types of perovskite layers with different crystal symmetries opens a path to novel ferroelectrics that cannot be obtained in a solid solution system. View Full-Text
Keywords: perovskite; ferroelectric; polarization; dielectric; BiFeO3; BaTiO3; superlattice; film; epitaxial thin film perovskite; ferroelectric; polarization; dielectric; BiFeO3; BaTiO3; superlattice; film; epitaxial thin film
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MDPI and ACS Style

Noguchi, Y.; Matsuo, H. Polarization and Dielectric Properties of BiFeO3-BaTiO3 Superlattice-Structured Ferroelectric Films. Nanomaterials 2021, 11, 1857. https://doi.org/10.3390/nano11071857

AMA Style

Noguchi Y, Matsuo H. Polarization and Dielectric Properties of BiFeO3-BaTiO3 Superlattice-Structured Ferroelectric Films. Nanomaterials. 2021; 11(7):1857. https://doi.org/10.3390/nano11071857

Chicago/Turabian Style

Noguchi, Yuji, and Hiroki Matsuo. 2021. "Polarization and Dielectric Properties of BiFeO3-BaTiO3 Superlattice-Structured Ferroelectric Films" Nanomaterials 11, no. 7: 1857. https://doi.org/10.3390/nano11071857

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