Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 21: Ultrafast Magnetization II
MA 21.2: Talk
Tuesday, March 17, 2020, 09:45–10:00, HSZ 101
Ultrafast dynamics of itinerant and localized magnetic moments in antiferromagnetic GdRh2Si2 — •Sang-Eun Lee1, Yoav William Windsor1, Daniela Zahn1, Kristin Kliemt2, Cornelius Krellner2, Denis V. Vyalikh3, and Laurenz Rettig1 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany — 2Goethe-Universität Frankfurt, Frankfurt am Main, Germany — 3DIPC, San Sebastián, Spain
The magnetic ordering in rare-earth based compounds is governed by the indirect exchange interaction (RKKY interaction) between the large, localized 4f-moments of the rare-earth atoms, mediated via the itinerant, weakly spin-polarized conduction electron bath. Yet how this coupling is active on an ultrafast timescale is still a matter of debate. GdRh2Si2 is an intermetallic model system, consisting of Gd layers stacked antiferromagnetically along the c-axis, separated by Si-Rh-Si slabs, which act as mediators for the RKKY interaction. Si-terminated surfaces of this compound have been shown to host metallic surface states at the surface Brillouin zone corners which become spin polarized due to the RKKY interaction below TN [1]. Employing time- and angle-resolved photoemission spectroscopy (trARPES), and time-resolved resonant magnetic X-ray diffraction (trRXRD), we investigate the ultrafast dynamics of itinerant surface state electrons, and of long-range ordered localized magnetic moments, respectively. Combining these results, we will discuss the implications for the RKKY interaction and the demagnetization pathway in this antiferromagnetic compound. [1] M. Güttler et al., Sci. Rep. 6, 24254 (2016)