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Spectroscopic probe of ultrafast magnetization dynamics in the extreme ultraviolet spectral range

Johanna Richter1,*, Somnath Jana1, Robert Behrends1, Carl S. Davies2, Dieter W. Engel1, Martin Hennecke1, Daniel Schick1, Clemens von Korff Schmising1,†, and Stefan Eisebitt1,3

  • *Contact author: johanna.richter@mbi-berlin.de
  • †Contact author: korff@mbi-berlin.de
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Phys. Rev. B 111, 214423 – Published 13 June, 2025

DOI: https://doi.org/10.1103/kjg2-t36b

Abstract

The development of spectroscopic techniques in the extreme ultraviolet (XUV) spectral range has significantly advanced the understanding of ultrafast interactions in magnetic systems triggered by optical excitation. In this work, we introduce a previously missing geometry that facilitates the observation of the ultrafast magnetization dynamics of magnetic systems with an out-of-plane magnetization grown on XUV opaque substrates. This approach to probing ultrafast magnetization dynamics combines the magneto-optical Kerr effect with the strong dependence of a sample's reflectance near its Brewster angle. It therefore works with linearly polarized light and does not require any additional polarizing optics. We provide a comprehensive analysis of the technique by presenting both simulations and experimental data as a function of the energy and the polarization of the XUV probe radiation as well as of the delay time after optical excitation.

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Phys. Rev. B 111, 214423– Published 13 June, 2025
  • Received 25 February 2025
  • Revised 19 May 2025
  • Accepted 29 May 2025
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