Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 52: Poster Magnetism III
MA 52.8: Poster
Thursday, March 12, 2026, 15:00–17:00, P4
Femtosecond noise correlation spectroscopy of magnon fluctuations in bismuth doped yttrium iron garnet — •C. Runge1, F. S. Herbst1, M. A. Weiss1, N. Beaulieu2, J. B. Youssef2, A. Leitenstorfer1, M. Lammel1, R. Schlitz1, and S. T. B. Goennenwein1 — 1Department of Physics, University of Konstanz, Germany — 2LabSTICC, CNRS, Université de Bretagne Occidentale, France
Magnetic systems exhibit a rich variety of dynamic phenomena on ultrafast timescales, which are of both fundamental and technological interest. For example, magnons, the quanta of spin waves, are discussed as promising candidates for information carriers due to their ability to propagate without charge transport. Femtosecond noise correlation spectroscopy (FemNoC) has been established [1] as a time-resolved optical technique that directly probes the local magnetization correlation function of a spin system. Thus, FemNoC is sensitive to incoherent magnetization dynamics like thermal magnons or random telegraph switching in the anisotropy landscape and allows to distinguish them by their respective correlation characteristics [1]. Here, we apply FemNoC to bismuth doped yttrium iron garnet. We investigate the magnon population of the sample both in thermal equilibrium and excited by ferromagnetic resonance. Introducing a quantitative model we can fit both regimes and determine the number of magnons induced by the resonant drive.
[1] M. A. Weiss et al., Nat. Commun. 14, 7651 (2023).
Keywords: Bi:YIG; FemNoC; correlation; magnon noise; optical probing