Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 38: Ultrafast Magnetization Effects II

MA 38.6: Vortrag

Mittwoch, 11. März 2026, 16:15–16:30, POT/0361

Exploring the ultrafast change of antiferromagnetic and ferromagnetic order in a Mn₂Au/Py bilayer — •Jendrik Gördes¹, Markus Weissenhofer^1,2, Sangeeta Thakur¹, Chowdhury S. Awsaf¹, Marcel Walter¹, Lorenzo Grilli¹, Deeksha Gupta³, Niko Pontius³, Christian Schüssler-Langeheine³, Peter M. Oppeneer², Martin Jourdan⁴, and Wolfgang Kuch¹ — ¹Freie Universität Berlin, Berlin, Germany — ²Uppsala University, Uppsala, Sweden — ³Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany — ⁴Johannes Gutenberg-Universität Mainz, Mainz, Germany

Antiferromagnetic (AFM) materials are promising candidates for future data storage devices. One noteworthy material is Mn₂Au, a metallic collinear AFM that can be electrically switched [1]. We report on the time-resolved change of AFM and ferromagnetic (FM) order of a Mn₂Au/permalloy (Py) bilayer after excitation with 800 nm fs laser pulses by X-ray magnetic linear and circular dichroism (XMLD and XMCD) in resonant soft X-ray reflectivity at the Mn and Fe L₃ edges. We observe an ultrafast loss and an exceptionally fast recovery of the AFM order within a few ps, much faster than the recovery of the adjacent FM order. Local and non-local mechanisms are considered in simulations using an atomistic spin model. The presented research highlights the fast dynamics of AFM layers for spintronic applications. [1] J. Železný, H. Gao, K. Výborný et al., PRL 113, 157201 (2014)

Keywords: Antiferromagnet; Mn2Au; Pump-probe; XMCD and XMLD; Ultrafast