Combining wide-field magneto-optical Kerr microscopy with a time-lapse analysis scheme allows investigating magnetization fluctuations with high spatial as well as temporal resolution. We here use this technique to study magnetization fluctuations in a thin ferromagnetic film prepared into a quasi-equilibrium magnetic state via a dedicated field sweep protocol. Our experiments reveal spatially localized noise hotspots distributed across the sample surface within the magnetic domains in the quasi-equilibrium state. The spatial density of the noise hot spots is very similar at different low magnetic field strengths, as expected from the fluctuation-dissipation theorem. The measurement scheme thus opens the way for the spatially resolved investigation of quasi-equilibrium noise processes in magnetic materials.
@article{arxiv.2409.15876,
title = {Spatial mapping of magnetization fluctuations via time-lapse Kerr microscopy},
author = {Xian-Yue Ai and Ivan Soldatov and Leon Oleschko and Seema and Martina Müller and Stefan Karpitschka and Rudolf Schäfer and Sebastian T. B. Goennenwein},
journal= {arXiv preprint arXiv:2409.15876},
year = {2024}
}