Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 21: Ultrafast Magnetization II

MA 21.10: Talk

Tuesday, March 17, 2020, 12:00–12:15, HSZ 101

Influence of the inverse Faraday effect on ultrafast switching processes in ferro- and antiferromagnets — •Tobias Dannegger¹, Marco Berritta², Severin Selzer¹, Ulrike Ritzmann^{2, 3}, Peter M. Oppeneer², and Ulrich Nowak¹ — ¹Fachbereich Physik, Universität Konstanz, D78457 Konstanz, Germany — ²Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden — ³Dahlem Center of Complex Quantum Systems and Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

Ultrafast all-optical magnetisation reversal has been of interest due to its promising potential in the development of fast magnetic recording devices. This talk presents atomistic spin dynamics simulations used with input from DFT calculations [1] to study the role of the inverse Faraday effect (IFE) in laser-induced switching processes in ferro- and antiferromagnetic spin systems, specifically L1₀-ordered FePt and CrPt. The magnitude of the magnetisation induced by the IFE as well as the duration for which it remains present after the laser pulse are varied as parameters. The simulation results for FePt show, in agreement with previous results [2], that single-pulse switching in FePt is not possible but the IFE can, at least for certain parameter values, significantly enhance the switching probability. In antiferromagnets, the faster dynamics of the spin system make those materials more susceptible to the influence of the optically induced magnetisation.

[1] M. Berritta et al. Phys. Rev. Lett. 117, 137203 (2016)

[2] R. John et al. Sci. Rep. 7, 4114 (2017)