Title: Jan Honolka: Magnetic order in 2D systems: example of RKKY-coupled Co spins on WS2 monolayers
Number: 21/20
Status: Closing date exceeded
Begin: Wednesday, 21.10. 2020, 14:10
Tutor: Vladimír Sechovský
Location: ZOOM Meeting ID: 958 0426 7376

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We have a pleasure to invite you to attend the joint seminar
of the Department of Condensed Matter Physics (DCMP)
and the Materials Growth and Measurement Laboratory (MGML)




Magnetic order in 2D systems: example of RKKY-coupled Co spins on WS2 monolayers

lecture given by:

Jan Honolka

Institute of Physics, Czech Academy of Sciences, Czech Republic
Meeting ID: 958 0426 7376 

on Wednesday, 21.10. 2020 from 14:10 CEST (12.10 UTC) 

Passcode will be provided on request at  This e-mail address is being protected from spambots. You need JavaScript enabled to view it

Vladimír Sechovský
On behalf of the DCMP and MGML


Magnetic order can break fundamental symmetries in 2D materials, which affects potential spintronic, optoelectronic and superconducting properties [1, 2].

Here, I will summarize our recent research on structural and electronic properties of various transition metal chalcogenide (TMC) materials and the implementation of magnetic degrees of freedom.

As an example, I will focus 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). 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.

[1] Kenneth S. Burch, David Mandrus & Je-Geun Park, Nature 563, 47–52 (2018)

[2] Xiao et al., PNAS 110, ,3738–3742 (2013)