Regensburg 2019 – scientific programme
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O: Fachverband Oberflächenphysik
O 7: Graphene I: Structure and Growth (joint session O/TT)
O 7.2: Talk
Monday, April 1, 2019, 11:00–11:15, H24
Adsorption Heights and Coupling Strength at Graphene/Ni(111) and h-BN/Ni(111) interfaces — •Christina Schott1, Johannes Seidel1, Markus Franke2, Anja Haags2, You-Ron Lin2, Martin Aeschlimann1, Christian Kumpf2, and Benjamin Stadtmüller1 — 1Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — 2Peter Grünberg Institut, Functional Nanostructures at Surfaces, 52425 Jülich, Germany
From a technological point of view, 2D material stacks consisting of light elements grown on ferromagnetic surfaces are highly promising for spintronic applications due to their low spin-orbit coupling and the large charge and spin carrier velocity. However, utilizing the exotic properties requires a minimization of the chemical interaction between the 2D layers and the ferromagnet. Therefore, we have investigated the interlayer interaction strength and coupling mechanisms in bilayer films of prototypical 2D materials on the ferromagnetic surface Ni(111) by using the NIXSW technique. The small vertical bonding distance between graphene or the nano-graphene molecule coronene and the Ni(111) surface suggests a strong chemical interaction across the interface. To achieve a decoupling of coronene from Ni, we used one layer of h-BN as a buffer layer between one the coronene layer and the Ni substrate. Here, we will discuss the modifications of the vertical adsorption height of gr and coronene upon the passivation of the Ni surface and correlate our findings to the chemical interaction and the vertical distortions of these 2D layers.