SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 67: Poster: Electronic Structure of Surfaces

O 67.8: Poster

Wednesday, March 29, 2023, 18:00–20:00, P2/EG

Spin-polarized very-low-energy electron diffraction from spin-orbit- and/or exchange-influenced targets — •Christoph Angrick1, Christian Thiede1, Andre Reimann1, Annika Henriksen1, Nicole Mutzke1, Moritz Ewert2,3, Lars Buss2,3, Jens Falta3, Jan Ingo Flege2, and Markus Donath11University of Münster, Germany — 2BTU Cottbus-Senftenberg, Germany — 3University of Bremen, Germany

Exchange (XC) or spin-orbit (SOC) interaction cause electron scattering from surfaces to be spin dependent. The resulting spin filtering of the scattered electron beam can be used in spin-polarization analyzers. These analyzers are implemented in, for instance, photoemission setups to obtain spin resolution. Therefore, for promising targets, electron reflectivity and resulting spin asymmetry of very-low-energy electrons are measured for a wide range of incident electron energies and angles. By this, the investigated target is put to a test regarding the usability as a scattering target in a spin-polarization analyzer.

Here, several results of SOC- as well as XC-influenced targets are presented. The results of the SOC-influenced targets Au(111), single-layer MoS2/Au(111) and W(110) [1] are compared with the results of the XC-influenced target Fe(001)-p(1x1)O [2]. Additionally, the influence of SOC interaction in the case of the XC-influenced target is investigated. The spin asymmetry caused by SOC is found to be one order of magnitude smaller than the spin asymmetry caused by XC.

[1] Angrick et al., J. Phys.: Condens. Matter 33, 115001 (2020).

[2] Thiede et al., Phys. Rev. Applied 1, 054003 (2014).

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