Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 26: Surface Magnetism
O 26.7: Talk
Tuesday, September 6, 2022, 12:00–12:15, H4
Circular dichroic UV-PEEM measurements of magnetic surfaces: From Magnetic Domain Imaging to Magnetoplasmonics — •Maximilian Paleschke and Wolf Widdra — Martin-Luther-Universität Halle-Wittenberg, Halle (Saale), Germany
Over the last decades, the rapid progress in the ultrafast optical manipulation of magnetic materials has opened the development of several new methods for the investigation and control of spin and magnetization dynamics. Here, we investigate magnetic thin films and nanostructures on nanometer-femtosecond scales with a newly-designed experimental setup. We combine state-of-the-art time-resolved photoemission electron microscopy (PEEM) with circular dichroism imaging and normal incidence excitation via a tunable femtosecond fiber laser system.
In this talk, we report on two dichroism imaging techniques, namely magnetic circular dichroism (MCD) and the recently discovered plasmonic dichroism. The first is used to image magnetic in-plane and out-of-plane domains of ferromagnetic surfaces. The second was successfully used to image propagating surface plasmon polaritons (SPPs) on a ferromagnetic material in threshold photoemission for the first time [1]. With this, we show clear edge-induced SPPs with sub-micrometer wavelength and propagation length of about 3.5 µm on polycrystalline Ni80Fe20 microstructures. This finding extends experimental investigation of SPPs to materials with high plasma frequency and large damping.
[1] M. Paleschke et al., New J. Phys. 23, 093006 (2021)