Two-Dimensional Magnets beyond the Monolayer Limit

Intrinsic two-dimensional (2D) magnetism has been demonstrated in various materials scaled down to a single monolayer. However, the question is whether 2D magnetism extends beyond the monolayer limit, to chemical species formed by sparse but regular 2D arrays of magnetic atoms. Here we show that sub...

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Published in:ACS nano 2021-07, Vol.15 (7), p.12034-12041
Main Authors: Tokmachev, Andrey M, Averyanov, Dmitry V, Taldenkov, Alexander N, Sokolov, Ivan S, Karateev, Igor A, Parfenov, Oleg E, Storchak, Vyacheslav G
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creator Tokmachev, Andrey M
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description Intrinsic two-dimensional (2D) magnetism has been demonstrated in various materials scaled down to a single monolayer. However, the question is whether 2D magnetism extends beyond the monolayer limit, to chemical species formed by sparse but regular 2D arrays of magnetic atoms. Here we show that sub-monolayer superstructures of Eu atoms self-assembled on the silicon surface exhibit strong magnetic signals. Robust easy-plane magnetism is discovered in both one- and two-dimensionally ordered structures with Eu coverage of half monolayer and above. The emergence of 2D magnetism manifests itself by a strong dependence of the effective transition temperature on weak magnetic fields. The results constitute a versatile platform for miniaturization of 2D magnetic systems and seed an expandable class of atomically thin magnets for applications in information technologies.
doi_str_mv 10.1021/acsnano.1c03312
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title Two-Dimensional Magnets beyond the Monolayer Limit
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