Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 30: Surface Magnetism
O 30.4: Vortrag
Dienstag, 18. März 2025, 11:15–11:30, H11
Imaging in-plane magnetic domains using magnetic circular dichroism in darkfield laser PEEM — •David Huber1, Friederike E. Wührl1, Frank O. Schumann2, and Wolf Widdra1 — 1Martin-Luther-Universität Halle-Wittenberg — 2Max-Planck-Insitut für Mikrostrukturphyisk, Halle
Magnetic circular dichroism (MCD) in threshold photoelectron emission microscopy (PEEM) enables imaging of magnetic domains at the nanoscale. Utilizing femtosecond (fs) laser excitation in a laboratory setting offers a significant advantage in terms of temporal resolution compared to more commonly used X-ray MCD measurements. However, this poses new challenges with respect to in-plane magnetization, given the previously reported low domain contrast [1,2].
In this contribution we show that symmetry breaking and photoelectron filtering in momentum and energy help to overcome these challenges. Using this methodology, we obtain MCD contrast for in-plane domains of 11 nm Fe(001)-(1× 1)-O on MgO(001) using both continuous wave and fs laser excitation at normal incidence and compare these results to a Fe(001)-(1× 1)-O single crystal in PEEM and µARPES.
[1] Marx et al., PRL 84, 5888 (2000).
[2] Nakagawa et al. PRL 96, 237402 (2006).
Keywords: Magnetic circular dichroism; Photoelectron emission microscopy; magnetic domain imaging; darkfield imaging; µARPES