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Intrinsic Magnetic Order of Chemically Exfoliated 2D Ruddlesden–Popper Organic–Inorganic Halide Perovskite Ultrathin Films

Title
Intrinsic Magnetic Order of Chemically Exfoliated 2D Ruddlesden–Popper Organic–Inorganic Halide Perovskite Ultrathin Films
Authors
Kim, Ki-YeonPark, GaramCho, JaehunKim, JoonwooKim, June-SeoJung, JinyongPark, KwonjinYou, Chun-YeolOh, In-Hwan
DGIST Authors
Kim, Ki-Yeon; Park, Garam; Cho, Jaehun; Kim, Joonwoo; Kim, June-Seo; Jung, Jinyong; Park, Kwonjin; You, Chun-Yeol; Oh, In-Hwan
Issue Date
2020-12
Citation
Small, 16(52), 2005445
Type
Article
Article Type
Article in press
Author Keywords
2D magnets2D Ruddlesden–Popper OIHPschemical exfoliationspin coating
Keywords
FERROMAGNETISMANTIFERROMAGNETISMCRYSTAL
ISSN
1613-6810
Abstract
Thin film fabrication of 2D layered organic–inorganic hybrid perovskites (2D-OIHPs) for spintronic applications has been attempted using solution-based process like Langmuir–Blodgett technique. However, monolayer or few-layered 2D magnets are not yet realized, even though a wide spectrum of 2D Ruddlesden–Popper (RP) OIHPs are known as quasi-2D Heisenberg magnets in bulk compounds. Here, chemical exfoliation by solvent engineering is applied to successfully synthesize large-sized, few unit-cell-thick 2D RP-OIHPs. Comprehensive structural characterization reveals that binary co-solvents with high relative polarity in spin coating technique are the most effective among nine kinds of solvents. Above all, this enables few-layered 2D RP-OIHP ultrathin films sustaining their intrinsic magnetic order. It is found that XY-like magnetic anisotropy driven by Jahn–Teller effect responsible for ferromagnetism in seven-layered (C6H5CH2CH2NH3)2CuCl4 ultrathin films remains very robust, whereas Ising-like dipolar anisotropy responsible for canted antiferromagnetism in ten-layered (C6H5CH2CH2NH3)2MnCl4 ultrathin films is greatly reduced. It is expected that ferromagnetism even at monolayer limit should be possible by means of further sophisticated solvent engineering as long as Jahn–Teller effect is active. The chemical exfoliation using solvent engineering unambiguously can bring about a new breakthrough in the development of 2D RP-OIHP van der Waals magnets for ultrahigh energy-efficient spintronic, opto-spintronic devices. © 2020 Wiley-VCH GmbH
URI
http://hdl.handle.net/20.500.11750/12534
DOI
10.1002/smll.202005445
Publisher
Wiley-VCH Verlag
Related Researcher
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Collection:
Division of Nanotechnology1. Journal Articles
Department of Physics and ChemistrySpin Phenomena for Information Nano-devices(SPIN) Lab1. Journal Articles


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