Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 27: Ultrafast Magnetization Effects I
MA 27.2: Vortrag
Mittwoch, 11. März 2026, 10:00–10:15, HSZ/0004
Ultrafast Control of Spin Periodicity in a Helical Heisenberg Antiferromagnet — •Hyein Jung1,2, Abeer Arora2, Deeksha Gupta3, Franziska Walther4, Kristin Kliemt4, Victoria C. A. Taylor2, Túlio de Castro2, Hanqian Lu1,2, Christian Schüßler-Langeheine3, Niko Pontius3, Urs Staub5, Cornelius Krellner4, Laurenz Rettig2, Ralph Ernstorfer1,2, and Yoav W. Windsor1,2 — 1Technische Universität Berlin, Berlin, Germany — 2Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany — 3Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany — 4Goethe-Universität Frankfurt, Frankfurt, Germany — 5Paul Scherrer Institut, Villigen, Switzerland
The ultrafast manipulation of spin structures is a promising route toward the next generation spintronic devices. In this work, we study the helical Heisenberg antiferromagnet EuCo2P2 using resonant soft X-ray diffraction (RXD). By probing the magnetic Bragg reflections, we are experimentally sensitive both to the antiferromagnetic (AF) order parameter and to the 4f spin periodicity. We measure their response under three distinct perturbations: (a) femtosecond laser excitation (ultrafast RXD), (b) external magnetic fields, and (c) temperature variation. Employing a Heisenberg model, we directly reveal how the observables respond to each of the perturbations we apply. We further probe the response of the crystal lattice under the same conditions as the spin order and draw a relation between the dynamics of the two. These results offer insight into different routes to control AF spin order and its couplings.
Keywords: Ultrafast Magnetization; Resonant X-ray Diffraction; Chiral Antiferromagnet; Incommensurate; Spin Structure