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TT: Fachverband Tiefe Temperaturen
TT 19: Low Dimensional Systems: Other Topics
TT 19.5: Vortrag
Montag, 16. März 2020, 18:00–18:15, HSZ 103
RKKY-coupled Co adatom spins on WS2 monolayers — •Jan Honolka1, Charlotte Sanders3, Sergey Mankovsky4, Brian Kiraly2, Sanjoy Mahatha3, Svetlana Polesya4, Martin Vondracek1, Ales Cahlik1, Sarnjeet Dhesi6, Jan Minar5, Hubert Ebert4, Philip Hofmann3, and Alexander Khajetoorians2 — 1Inst. of Physics ASCR, Na Slovance 4, CZ-8000 Praha — 2Radboud Univ. Nijmegen, Inst. Molecules & Mat., NL-6525 AJ Nijmegen — 3Aarhus Univ., Dept. Physics and Astronomy, DK-8000 Aarhus — 4Ludwig Maximilians Univ. Muenchen, Dept. Chem., D-81377 Munich — 5Univ. West Bohemia, New Technol. Research Center, Univ. 2732, CZ-30614 Pilsen — 6Diamond Light Source, UK-OX11 0DE Didcot
Antiferromagnetic order can potentially change fundamental symmetries in 2D materials. Here we report on magnetic and structural properties of cold-deposited Co atoms on single layer WS2/Au(111), which are characterised by X-ray magnetic circular dichroism (XMCD) measurements and scanning tunneling microscopy (STM) and spectroscopy (STS), respectively. We observe a highly compensated magnetic state at intermediate Co coverages of 0.2 - 0.3 monolayers. Density functional theory shows that indirect RKKY coupling constants between Co adatoms are of the order of few meV and negative at Co-Co distances 0.5 - 1 nm, which creates a non-collinear magnetic structure. In the limit of 1 monolayer ferromagnetism sets in. Strain effects due to the substrate are discussed.