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MA: Fachverband Magnetismus
MA 26: Ultrafast Magnetization Effects I
MA 26.7: Vortrag
Mittwoch, 19. März 2025, 16:30–16:45, H16
Accelerated ultrafast demagnetization of an interlayer-exchange-coupled Co/Mn/Co trilayer — •Jendrik Gördes1, Ivar Kumberg1, Chowdhury S. Awsaf1, Marcel Walter1, Tauqir Shinwari1, Sangeeta Thakur1, Sangeeta Sharma2, Christian Schüßler-Langeheine3, Niko Pontius3, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Berlin — 2Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Berlin — 3Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin
We studied the influence of the spin structure of an antiferromagnetic (AFM) layer at the interface to a ferromagnetic (FM) layer on the FM magnetization dynamics in epitaxial Co/Mn/Co/Cu(001) trilayers. The two FM layers are coupled indirectly by the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction and directly by exchange through the AFM spin structure [1]. Deposition of Mn in a wedge allowed for access to different coupling regimes on the same sample. Magnetization dynamics were probed after excitation with 800 nm fs laser pulses by X-ray magnetic circular dichroism in reflectivity. A difference in demagnetization time between the two regimes for parallel and antiparallel alignment of FM is observed. We explain this by differences in the AFM spin structure leading to presence or absence of optically induced intersite spin transfer [2] between Mn and Co. [1] B. Zhang et al., J. Appl. Phys. 115, 233915 (2014). [2] J. K. Dewhurst et al., Nano Letters 18, 1842 (2018)
Keywords: XMCD; Ultrafast dynamics; Pump-probe; Antiferromagnet