Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 47: Poster III
MA 47.4: Poster
Donnerstag, 21. März 2024, 15:00–18:00, Poster D
Spin Noise Experiments in Yttrium Iron Garnet Films — •Franz S. Herbst, Daniel Anic, Marvin A. Weiss, and Sebastian T. B. Goennenwein — Department of Physics, University of Konstanz, Germany
Thermal spin fluctuations can be used as a powerful yet non-perturbative experimental probe for the magnetic behavior of correlated materials. The analysis of magnetization fluctuation data using different statistical metrics, such as autocorrelation or noise power spectral density, grants direct access to equilibrium material properties and incoherent magnetization dynamics - even down to ultrafast time scales [1].
Yttrium Iron garnet (Y3Fe5O12, YIG) is considered as a prototypical material for future spintronic devices, due to its extremely low magnon damping. However, spin fluctuations in YIG have not been systematically studied to date. Here we investigate the magnetization noise in YIG over a broad range of frequencies and for different external magnetic fields using the magneto-optical Faraday effect. We analyze our experimental data in particular regarding non-stationary relaxation processes and assess the effect of non-ergodicity using toy model simulations.
[1] Weiss et. al., Nat. Commun. 14, 7651 (2023).
Keywords: spin noise; YIG; magneto-optics