Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: Poster II
MA 46.60: Poster
Donnerstag, 21. März 2024, 15:00–18:00, Poster C
Studying all-optical magnetization switching of GdFe by double-pulse laser excitation — Rahil Hosseinifar1, Ivar Kumberg1, Felix Steinbach2, •Sangeeta Thakur1, Sebastien E. Hadjadj1, Jendrik Gördes1, Mario Fix3, Josè Miguel Lendìnez4, Chowdhury Awsaf1, Manfred Albrecht3, Florian Kronast5, Unai Atxitia4, Clemens von Korff Schmising2, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born Straße 2A, 12489 Berlin, Germany — 3Institut für Physik, Universität Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany — 4Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid, Spain — 5Helmholtz-Zentrum Berlin, Albert-Einstein-Straße 15, 12489 Berlin, Germany
We performed double-pulse experiments on a Gd26Fe74 ferrimagnetic alloy with a magnetic compensation temperature of about 120 K by x-ray magnetic circular dichroism photoelectron emission and optical Kerr microscopy. We demonstrate the effects of different ratios of fluence between two single laser pulses of 800 nm wavelength and a duration of 120 and 250 fs, at 70 K and at room temperature. We identified a time delay between 3 and 20 ps at which all-optical switching is suppressed. Atomistic spin dynamics (ASD) simulations have been carried out to describe the non-equilibrium dynamics following the excitation. They successfully describe the behaviour of the switching as a function of laser fluences and time delay between the two pulses.
Keywords: Double-pulse; All-optical switching; ASD; PEEM; Kerr microscopy