Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 38: Ultrafast Magnetization Effects II
MA 38.7: Talk
Wednesday, March 11, 2026, 16:30–16:45, POT/0361
Intrinsic timescales of ferro- and antiferromagnets in ultrafast demagnetisation — •Tobias Dannegger1, Stephan Wust2, Paul Herrgen2, Martin Aeschlimann2, Benjamin Stadtmüller3, and Ulrich Nowak1 — 1Fachbereich Physik, Universität Konstanz, Konstanz, Germany — 2Department of Physics and Research Center OPTIMAS, RPTU University Kaiserslautern-Landau, Kaiserslautern, Germany — 3Experimentalphysik II, Institute of Physics, University of Augsburg, Germany
For small deviations from the ground state, the spin dynamics of a magnetically ordered material can be described within linear spin-wave theory. There is a well known difference between the intrinsic timescales, given by the eigenfrequencies, of ferro- and antiferromagnets, the latter being approximately two orders of magnitude faster. Here, we present a systematic investigation, based on atomistic spin dynamics simulations, of how ferro- and antiferromagnetic ordering affects the intrinsic timescales of the magnetic order parameter far away from equilibrium, such as in ultrafast light-induced quenching experiments. We find that the speed advantage of antiferromagnets persists in the strongly non-equilibrium regime, but with some striking qualitative differences for very large excitations, where antiferromagnets slow down while the ferromagnetic quenching efficiency increases again.
Keywords: ultrafast demagnetisation; antiferromagnetic spintronics; Mn2Au