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MA: Fachverband Magnetismus

MA 46: Poster II

MA 46.60: Poster

Thursday, March 21, 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