Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 3: Thin Film Characterisation: Structure Analysis and Composition I

DS 3.10: Vortrag

Montag, 20. März 2017, 12:00–12:15, CHE 91

Magneto-optical polarization spectroscopy on graphene-metal interfaces in the soft-x-ray regime — •Christine Jansing¹, Hans-Christoph Mertins¹, Markus Gilbert¹, Maxim Krivenkov², Andrei Varykhalov², Oliver Rader², Andreas Gaupp², Andrey Sokolov², Hud Wahab³, Heiko Timmers³, Dominik Legut⁴, and Peter M. Oppeneer⁵ — ¹Münster University of Applied Sciences, Stegerwaldstr. 39, D-48565 Steinfurt — ²HZB, Albert Einstein Str. 15, D-12489 Berlin — ³Uni. of New South Wales, Canberra, ACT 2600, Australia — ⁴IT4Innovations Center, VSB-Technical University of Ostrava, CZ-708 33 Ostrava, Czech Republic — ⁵Dept. of Physics and Astronomy, Uppsala University, Sweden

We present magneto-optical polarization and x-ray natural linear dichroism measurements [1] at the C 1s edge of graphene on metallic substrates. Graphene-metal interfaces show a strong hybridization between graphene π-states and 3d-states of the metallic substrate. Intercalation of gold in the graphene/Ni system leads to a change in the orientation and strength of this bonding which is deduced quantitatively. Additionally we observe a shift of the conduction bands (CB) at the Dirac point while the CB at the M-point is not affected. Furthermore the XMCD as well as T-MOKE of graphene/Ni is presented, which allows for the determination of the spin split density of states of the CB and the determination of the magnetic moment of magnetized graphene showing that magnetism in graphene is carried by the π-orbitals. [1] C. Jansing, H.-Ch. Mertins et al., Phys. Rev. B 94, 045422 (2016)