Large-scale epitaxy of two-dimensional van der Waals room-temperature ferromagnet Fe5GeTe2

• DOI: 10.1038/s41699-022-00285-w
• Publication Date: 2022-02-23T11:05:25Z
• Authors: Mário Ribeiro; Giulio Gentile; Alain Marty; Djordje Dosenovic; Hanako Okuno; Céline Vergnaud; Jean-François Jac...; Denis Jalabert; Danilo Longo; Philippe Ohresser; Ali Hallal; Mairbek Chshiev; Olivier Boulle; Frédéric Bonell; Matthieu Jamet
• Keywords: Magnetocrystalline anisotropy; Stoichiometry; Atmospheric temperature range

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 such can be conceived to harness and couple a wide range magneto-optical magneto-electrical properties, technologically relevant applications require Curie temperatures at or above room-temperature ability grow films over large areas. Here we demonstrate large-area growth single-crystal ultrathin stoichiometric Fe5GeTe2 on insulating substrate using molecular beam epitaxy. Magnetic measurements show persistence soft ferromagnetism up room temperature, with temperature 293 K, weak out-of-plane magnetocrystalline anisotropy. Surface, chemical, structural characterizations confirm layer-by-layer growth, 5:1:2 Fe:Ge:Te elementary composition, single crystalline character films.