Regensburg 2022 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 22: 2D Materials 8 (joint session DS/CPP)

DS 22.5: Vortrag

Donnerstag, 8. September 2022, 10:30–10:45, H17

Epitaxial growth of Fe_5−xGeTe₂ films with a Curie temperature above 300 K on graphene — Hua Lv¹, Jens Herfort¹, Jürgen Schubert², Michael Hanke¹, Manfred Ramsteiner¹, and •Joao Marcelo J. Lopes¹ — ¹Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Germany — ²Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich, Germany

Synthesis of magnetic 2D materials exhibiting transition temperatures at or above 300 K is a crucial step towards the development of ultra-compact spintronic devices. Here, we report our recent progress on epitaxial growth of the 2D ferromagnet Fe_5−xGeTe₂ via MBE on graphene on SiC(0001). Thin films with a thickness of about 10 nm and different Fe concentrations were studied. Characterization performed with methods such as in-situ RHEED and grazing incidence X-ray diffraction confirmed the formation of epitaxial layers with good crystalline quality. Magneto-transport measurements and SQUID magnetometry were employed to assess the electrical and magnetic properties. They reveal that the MBE-grown Fe_5−xGeTe₂ exhibits a metallic behavior for all investigated Fe concentrations. In addition, composition-dependent magnetic anisotropies and Curie temperatures (T_C) were deduced. For the Fe content close to 5, a predominant easy out-of-plane orientation and T_C well above 300 K were measured. These results are relevant for the further development of wafer-scale fabrication of magnetic 2D materials aiming at the realization of multifunctional, atomically thin devices.