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MA: Fachverband Magnetismus
MA 27: Ultrafast Magnetization Effects I
MA 27.8: Vortrag
Mittwoch, 11. März 2026, 11:45–12:00, HSZ/0004
Ultrafast angular momentum transfer in RKKY-coupled 4f antiferromagnets — S.-E. Lee1, Y.W. Windsor1,2, D. Zahn1, A. Kraiker3, K. Kummer3, K. Kliemt4, C. Krellner4, C. Schüssler-Langeheine5, N. Pontius5, U. Staub6, D.V. Vyalikh7, A. Ernst8, and •L. Rettig1,9 — 1Fritz-Haber-Institut der MPG, DE — 2TU Berlin, DE — 3ESRF, Grenoble, FR — 4Goethe-Universität Frankfurt, DE — 5Helmholtz-Zentrum Berlin, DE — 6PSI, Villigen, CH — 7DIPC, San Sebastian, ES — 8Johannes Kepler University, Linz, AU — 9RPTU Kaiserslautern-Landau, DE
Antiferromagnets allow for direct angular momentum (AM) transfer between opposing spins, thereby avoiding AM transfer to the lattice, which limits ultrafast magnetization dynamics in ferromagnets. Here, we study the ultrafast magnetization dynamics in 4f antiferromagnetic intermetallics of type LnRh2Si2 (Ln=Pr, Nd, Sm, Gd, Tb, Dy, Ho) where we modify the magnitude of the on-site RKKY coupling strength via substitution of Ln ions. By combining time-resolved soft X-ray diffraction with ab-initio calculations, we find that the rate of AM transfer between opposing moments is directly determined by this coupling [1]. Moreover, the influence of itinerant conduction electrons has been explored in the Series GdT2Si2 by varying the transition metal T (T=Co, Rh, Ir). Here, we find a more than twofold increase in ultrafast AM transfer rate between the materials, which we associate with modifications in the conduction electron susceptibility due to differences in their density of states [2].
[1] Nat. Mater. 21, 514 (2022) [2] PRR 6, 043019 (2024)
Keywords: RKKY; resonant diffraction; antiferromagnet; ultrafast; angular momentum transfer