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Article Dans Une Revue npj 2D Materials and Applications Année : 2022

Large-scale epitaxy of two-dimensional van der Waals room-temperature ferromagnet Fe$_5$GeTe$_2$

Alain Marty
Danilo Longo
Philippe Ohresser
Ali Hallal
Olivier Boulle
Frédéric Bonell
Matthieu Jamet

Résumé

In recent years, two-dimensional van der Waals materials have emerged as an important platform for the observation of long-range ferromagnetic order in atomically thin layers. Although heterostructures of such materials can be conceived to harness and couple a wide range of magneto-optical and magneto-electrical properties, technologically relevant applications require Curie temperatures at or above room-temperature and the ability to grow films over large areas. Here we demonstrate the large-area growth of single-crystal ultrathin films of stoichiometric Fe$_5$GeTe$_2$ on an insulating substrate using molecular beam epitaxy. Magnetic measurements show the persistence of soft ferromagnetism up to room temperature, with a Curie temperature of 293 K, and a weak out-of-plane magnetocrystalline anisotropy. Surface, chemical, and structural characterizations confirm the layer-by-layer growth, 5:1:2 Fe:Ge:Te stoichiometric elementary composition, and single crystalline character of the films.
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Dates et versions

hal-03271458 , version 1 (29-06-2021)
hal-03271458 , version 2 (03-03-2022)

Identifiants

Citer

Mário Ribeiro, Giulio Gentile, Alain Marty, Djordje Dosenovic, Hanako Okuno, et al.. Large-scale epitaxy of two-dimensional van der Waals room-temperature ferromagnet Fe$_5$GeTe$_2$. npj 2D Materials and Applications, 2022, 6 (1), pp.10. ⟨10.1038/s41699-022-00285-w⟩. ⟨hal-03271458v2⟩
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