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Semináře

 
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: Středa, 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) http://mgml.eu.

 

Program

 

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

 

https://cesnet.zoom.us/j/95804267376
Meeting ID: 958 0426 7376 

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


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Vladimír Sechovský
On behalf of the DCMP and MGML


Abstract 

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)