SKM 2021 – scientific programme
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MA: Fachverband Magnetismus
MA 3: Posters Magnetism I
MA 3.2: Poster
Monday, September 27, 2021, 13:30–16:30, P
Tailoring magnetic anisotropy by graphene-induced skyhook effect of 4f metals — •Alexander Herman1, Stefan Kraus2, Shigeru Tsukamoto3, Lea Spieker1, Tobias Lojewski1, Damian Günzing1, Tobias Hartl2, Jan Gui-Hyon Dreiser4, Bernard Delley4, Katharina Ollefs1, Thomas Michely2, Nicolae Atodiresei3, and Heiko Wende1 — 1Faculty of Physics and Center for Nanointegration, Duisburg-Essen — 2II. Physikalisches Institut, Universität zu Köln — 3Peter Grünberg Institute and Institute for Advanced Simulation, FZ Jülich — 4SLS, Paul Scherrer Institut (CH)
From macroscopic heavy-duty permanent magnets to nanodevices the precise control of the magnetic properties in rare-earth metals is crucial for many applications used in our daily life. Therefore, a detailed understanding and manipulation of the 4f-metals magnetic properties represent the key to further boost the functionalization and efficiency of practical applications. We present a proof-of-concept surface-alloy system in which graphene induces a skyhook effect on a 4f metal and therefore modifies its magnetic properties. We demonstrate that by adsorbing graphene onto a long-range ordered two-dimensional dysprosium-iridium surface alloy, the magnetic 4f metal atoms are selectively lifted from the surface alloy and a giant magnetic anisotropy is introduced in dysprosium atoms as a result of manipulating its geometrical structure within the surface alloy. Our combined theoretical simulations and experimental measurements provide an easy and unambiguous understanding of its underlying mechanism. Financial support by DFG through projects WE 2623/17-1, MI 581/23-1, and AT 109/5-1.