Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 18: Poster Monday: 2D Materials 1

O 18.12: Poster

Monday, September 5, 2022, 18:00–20:00, P4

Intercalation of Fe under graphene on Ir(110) — •Jason Bergelt, Affan Safeer, Stefan Kraus, Jeison Fischer, and Thomas Michely — II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany

Graphene on Ir(110) is a single-crystal, where graphene is nearly strain free and the resulting moiré pattern consists of waves with crests and troughs along the [001]-Ir direction. Also it has been shown that the growth of graphene prevents the formation of nano-facets that are present in bare Ir(110) at room temperature. In this work, we intercalated several layers of Fe between Gr and unreconstructed Ir(110). By using scanning tunneling microscopy (STM) and low energy electron diffraction (LEED), we confirm that Fe grows pseudomorphic with respect to unreconstructed Ir(110). Due to strong adhesion of graphene to Ir(110), deposition of Fe on a closed graphene layer results in the formation of clusters on the surface and negligible intercalation at temperatures where alloying of Fe with Ir(110) is absent. Therefore, we implemented a procedure to etch with molecular oxygen small holes of controlled size into graphene. Moreover, we investigated the temperature and evaporation flux dependence of intercalation. Furthermore, we discuss the limit of pseudomorphic growth in view of the formation of a reconstruction at thicker intercalated Fe films.