Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 8: Ultrafast Magnetization Effects 1
MA 8.3: Talk
Monday, September 5, 2022, 15:30–15:45, H37
Table-top X-ray magnetic circular dichroism at the Fe L edges — •Martin Borchert1,2, Daniel Schick1, Clemens v. Korff Schmising1, Denny Sommer1, Dieter Engel1, Bastian Pfau1, and Stefan Eisebitt1,2 — 1Max-Born-Institut, Berlin — 2TU Berlin
Time-resolved X-ray magnetic circular dichroism (XMCD) is a powerful tool to directly probe the element-specific magnetization in multi-component heterostructures.
Due to the lack of laboratory-scale light sources with sufficient brightness and control over the light’s polarization, static and time-resolved XMCD studies in the higher soft X-ray photon energy range have so far been limited to large-scale facilities such as synchrotrons and free-electron lasers.
Here, we present first XMCD spectroscopy data recorded at the Fe L3,2 resonances employing a laboratory-scale soft X-ray source utilizing a magnetic thin-film polarizer to circularly polarize the soft X-rays from the continuous, broadband (50–1500 eV) emission of a laser-driven plasma source with <10 ps pulse duration. A reflection zone plate (RZP) is used as the single optical element to collect, disperse and focus the full spectrum across the Fe L edges through a thin-film sample, to which an external magnetic field can be applied to observe the resulting asymmetry spectrum, as well as hysteresis loops.
Utilizing different RZPs, this setup enables the first laboratory-based whitelight XMCD spectroscopy with picosecond time resolution, covering the full spectrum of the magnetically relevant resonances from the transition metal M and L edges up to the rare earth M edges.