SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Poster Magnetism II
MA 40.55: Poster
Donnerstag, 30. März 2023, 14:00–16:00, P2/EG
Dual-pulse-excitation all-optical switching of a Gd26Fe74 ferrimagnet — •Rahil Hosseinifar1, Ivar Kumberg1, Felix Steinbach2, Sangeeta Thakur1, Sebastien Hadjadj1, Jendrik Gordes1, Chowdhury Awsaf1, Mrio Fix3, Manfred Albrecht3, Florian Kronast4, Clemens von Korff Schmising2, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Berlin, Germany — 2Max Born Institute for Nonlinear Optics and and Short Pulse Spectroscopy, Max-Born Straße 2A, 12489 Berlin, Germany — 3Institut für Physik, Universität Augsburg, Universitätsstraße 1, Augsburg, Germany — 4Helmholtz-Zentrum Berlin, Albert-Einstein-Straße 15, 12489 Berlin, Germany
Individual linearly p-polarized laser pulses of 800 nm wavelength above a specific threshold fluence can reverse the magnetization of ferrimagnetic samples. We study this all-optical toggle switching in Gd26Fe74 ferrimagnetic alloys with out-of-plane easy axis of magnetization after dual-pulse excitation by x-ray magnetic circular dichroism photoelectron emission microscopy. The time between the two spatially overlapped pulses is varied. The experiment is done at room temperature and at 70 K, above and below the magnetic compensation temperature of the sample. In both cases, when the time delay is less than 1 ps, the threshold for toggle switching decreases. At T=70 K, all the region in the footprint of the laser pulse above a certain fluence switches deterministically. However, at room temperature, in addition to a region of deterministic switching, another region appears at higher fluences where multi-domain nucleation is observed.