Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 3: Ultrafast Magnetization Effects I
MA 3.8: Talk
Monday, March 18, 2024, 11:45–12:00, H 2013
Ultrafast dynamics of different magnetic properties in a helical Heisenberg antiferromagnet — •Hyein Jung1,2, Abeer Arora2, Victoria Taylor2, Túlio de Castro2, Franziska Walther3, Kristin Kliemt3, Christian Schüßler-Langeheine4, Niko Pontius4, Urs Staub5, Cornelius Krellner3, Laurenz Rettig2, Ralph Ernstorfer1,2, and Yoav William Windsor1,2 — 1Technische Universität Berlin, Berlin, Germany — 2Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany — 3Goethe-Universität Frankfurt, Frankfurt, Germany — 4Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany — 5Paul Scherrer Institut, Villigen, Switzerland
Ultrafast control of spin order holds great promise for future devices. In particular, Eu-based magnetism is appealing due Eu’s extremely high moment size. However, the spatially localized 4f magnetic states interact indirectly, mediated by the conduction electrons via Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction. Control of RKKY presents a new avenue for manipulation of spin order, which is of great need particularly for manipulation of antiferromagnets, which are largely considered the basis for next-generation spintronics. Here, we study ultrafast spin dynamics in the chiral antiferromagnet (AF) EuCo2P2 using resonant X-ray diffraction. We probe two magnetic observables: the size of the AF-ordered spins and their periodicity. We demonstrate that following ultrafast photoexcitation, they depart from the expected thermal behavior, revealing distinct nonthermal dynamics in magnon population and strength of the RKKY coupling between Eu 4f states.
Keywords: Ultrafast Magnetization; resonant x-ray diffraction; RKKY; chiral antiferromagnet