Large-area van der Waals epitaxy and magnetic characterization of Fe<sub>3</sub>GeTe<sub>2</sub> films on graphene
J. M. J. Lopes, Dietmar Czubak, Eugenio Zallo, A. I. Figueroa, Charles Guillemard, Manuel Valvidares, Juan Rubio‐Zuazo, Jesús López‐Sánchez, Sergio O. Valenzuela, Michael Hanke, M. Ramsteiner
Abstract
Abstract Scalable fabrication of magnetic 2D materials and heterostructures constitutes a crucial step for scaling down current spintronic devices and the development of novel spintronic applications. Here, we report on van der Waals (vdW) epitaxy of the layered magnetic metal Fe 3 GeTe 2 (FGT)—a 2D crystal with highly tunable properties and a high prospect for room temperature ferromagnetism (FM)—directly on graphene by employing molecular beam epitaxy. Morphological and structural characterization confirmed the realization of large-area, continuous FGT/graphene heterostructure films with stable interfaces and good crystalline quality. Furthermore, magneto-transport and x-ray magnetic circular dichroism investigations confirmed a robust out-of-plane FM in the layers, comparable to state-of-the-art exfoliated flakes from bulk crystals. These results are highly relevant for further research on wafer-scale growth of vdW heterostructures combining FGT with other layered crystals such as transition metal dichalcogenides for the realization of multifunctional, atomically thin devices.