Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 38: Ultrafast Magnetization Effects II
MA 38.6: Talk
Wednesday, March 11, 2026, 16:15–16:30, POT/0361
Exploring the ultrafast change of antiferromagnetic and ferromagnetic order in a Mn2Au/Py bilayer — •Jendrik Gördes1, Markus Weissenhofer1,2, 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