Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 9: Ultrafast Magnetization Effects II
MA 9.3: Vortrag
Montag, 18. März 2024, 15:45–16:00, H 2013
Unraveling light-driven spin transfer and hot carrier dynamics by EUV magneto-optical spectroscopy — •G. S. Matthijs Jansen1, Christina Möller1, Henrike Probst1, John Kay Dewhurst2, Marcel Reutzel1, Sangeeta Sharma2, Daniel Steil1, and Stefan Mathias1 — 1I. Physikalisches Institut, Georg-August-Universität Göttingen — 2Max-Born-Institute for Non-linear Optics and Short Pulse Spectroscopy, Max-Born Strasse 2A, 12489 Berlin, Germany
In recent years, extreme ultraviolet magneto-optical spectroscopy has helped to identify a number of unique ultrafast magnetization processes, including optical inter-site spin transfer (OISTR) and delayed demagnetization in Fe-Ni alloys. However, the interpretation in terms of the element-resolved magnetic moment in non-equilibrium is not always straightforward, as we have recently shown for transverse magneto-optical Kerr spectroscopy of Ni and Fe-Ni thin films [1, 2]. To overcome this issue, we demonstrate that an angle-resolved analysis enables complete access to the magneto-optical response function, and moreover enables a quantitative comparison to ab-initio theoretical calculations. Through such an analysis, we are able to verify the existence of OISTR in Fe-Ni alloys and furthermore shine light on the intimate connection between OISTR and delayed demagnetization [2].
[1] H. Probst et al., arXiv preprint arXiv:2306.02783 (2023)
[2] C. Möller et al., arXiv preprint arXiv:2306.02793 (2023)
Keywords: Extreme ultraviolet spectroscopy; T-MOKE; OISTR; dielectric tensor