Dresden 2020 – wissenschaftliches Programm

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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 Khajetoorians21Inst. 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.

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