SKM 2023 – scientific programme
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DS: Fachverband Dünne Schichten
DS 12: Poster
DS 12.22: Poster
Wednesday, March 29, 2023, 17:00–19:00, P3
structural and magnetic properties of two dimensional (2D) FexGeTe2 and Fe xGaTe2 grown by molecular beam epitaxy (MBE) — •Atekelte Kassa, Hua Lv, Neha Aggrawal, Michael Hanke, Abbes Tahraoui, Manfred Ramsteiner, and Marcelo Lopes — Paul-Drude-Institut für Festkörperelektronik, Leibniz Institut im Forschungsverbund Berlin e.V., Berlin, Germany
2D materials with intrinsic functionality showed importance in fundamental condensed-matter science and for the development of advanced technologies, where 2D ferromagnetic materials have raised interest for developing low dimensional magnetic/spintronic devices. Yet maintaining 2D ferromagnetism at /above room temperature remains a challenge. This work presents our recent results on 2D ferromagnets of FexGeTe2 and Fe xGaTe2 (3≤ x≤5) prepared using MBE. Films were grown at 300 ∘C using elemental fluxes of Fe, Ge (Ga), and Te on epitaxial graphene on SiC (0001). Epitaxial films with good structural quality were confirmed by reflection high-energy electron diffraction and X-ray Diffraction. Atomic force microscopy confirmed continuous and smooth surface growth. Raman spectroscopy results showed that the graphene layers remain structurally unaltered after MBE growth. Anomalous Hall effect investigations through Magneto-transport studies identified a perpendicular magneto anisotropy as well as a Curie temperature (Tc) above 300 K for both films with Fe composition close to x=5. For Fe xGaTe2, Tc values around 380 K were obtained. These results make the studied ferromagnets promising for the development of novel spintronic devices based on 2D materials and heterostructures.