Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 35: Poster 2
MA 35.19: Poster
Thursday, September 8, 2022, 16:00–18:00, P4
Influence of metallic substrates on the OISTR effect in permalloy thin films — •Martin Anstett1, Simon Häuser1, Jonas Hoefer1, Laura Scheuer1, Philipp Pirro1, Burkard Hillebrands1, Benjamin Stadtmüller1,2, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — 2Institute of Physics, Johannes Gutenberg University Mainz, 55128 Mainz, Germany
Optical manipulation of magnetic materials on extremely short, sub-100 fs timescales can be achieved either by generation and injection of optically induced (ballistic) spin currents or by direct excitation of the spin system, for instance by the optically induced spin transfer (OISTR) effect as shown in [1, 2].
In this work, we aim to reveal the mutual interplay of these spin-transfer effects on ultrafast timescales. Therefore, we investigate the ultrafast demagnetization of a thin Fe20Ni80 alloy on a non-magnetic Au substrate and how it is influenced by the spin-dependent charge transport into the Au substrate. As an element-resolved probe of the spin dynamics, we employ time-resolved Kerr spectroscopy with fs-XUV radiation in transversal geometry to disentangle the spectroscopic signatures of the OISTR and ballistic spin transport in this material. Our results will be compared to the magnetization dynamics of a Fe20Ni80 film on an insulating substrate.
References: [1] Dewhurst et al.; Nano Lett., 2018; 18: 1842*1848 [2] Hofherr et al., Sci. Adv., 2020; 6: eaay8717