Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 2: Ultrafast Magnetization I

MA 2.6: Talk

Monday, March 16, 2020, 10:45–11:00, HSZ 101

Influence of a non-magnetic substrate on optically induced transport in a ferromagnetic alloy — •Simon Häuser¹, Moritz Hofherr¹, Martin Stiehl¹, Jonas Hoefer¹, Martin Anstett¹, Gregor Zinke¹, Laura Scheuer¹, Sebastian Thomas Weber¹, Christopher Seibel¹, Daniel Steil², Stefan Mathias², Bärbel Rethfeld¹, Philipp Pirro¹, Burkard Hillebrands¹, Benjamin Stadtmüller¹ und Martin Aeschlimann¹ — ¹TU Kaiserslautern, Erwin-Schrödinger Straße 46, 67663 Kaiserslautern, Germany — ²Georg-August-Universität Göttingen, I. Physikalisches Institut, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

Optical manipulation of magnetic materials on extremely short, sub-100fs timescales can be achieved either by generation and injection of optically induced (ballistic) spin currents or by direct excitation of the spin system, i.e., by the optically induced spin transfer (OISTR) effect. 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 as well as the influence of the spin current into the Au substrate. As an element-resolved probe of the spin dynamics, we employ time resolved Kerr spectroscopy at the M-edge 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.