SCS Community Proposals
Community proposals are intended to bring together researchers with a common interest in particular instrumentation so that the burden of the first, risky experiments at a new instrument does not fall on particular individuals. They are not intended to replace individual proposals of the same type submitted to access many user facilities.
Non-linear X-ray absorption
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Developing high repetition rate X-ray absorption spectroscopy at EuXFEL.
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Better understanding of non-linear interaction between soft X-rays and prototypical solids across multiple elemental resonances up to MHz repetition rates.
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Highest efficiency in using the provided photons (MHz vs single shot)
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Establish fluence thresholds (sample damage, electronic damage, heating) comparing different systems (metal vs insulator).
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Determine X-ray effects on magnetization
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Mailing list: nl-xas-scs@xfel.eu
Time-resolved X-ray absorption
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Systematic understanding of time-resolved XAS.
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Explore time-resolved effects on XAS after laser / THz pumping.
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E.g. Indirect magnon pumping in NiO and effects on electronic structure.
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Mailing list: tr-xas-scs@xfel.eu
Non-linear X-ray scattering
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Non-linear X-ray scattering on a – most likely magnetic – sample.
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What is the origin of non-linear magnetic SAXS?
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Data available for soft X-ray limited in intensity, pulse length, only Co.
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Variation of: x-ray fluence, pulse length, different elements (3d, rare earth?)
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Using scattering as a channel for XMCD, magnetic scattering shows non-linearity at lower fluences (maybe comparison with charge scattering)
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Using nanostructures, inhomogeneities, nanoparticles to look at different constituents (strength of the reciprocal space)
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Commissioning aspect: Preparation for time-resolved scattering experiments
- Mailing list: nl-scattering-scs@xfel.eu
Time-resolved X-ray scattering
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Magnetic scattering, explore exchange-driven systems (3d, 100 fs) and spin-orbit driven systems (skyrmion, chiral, 100 fs and slower).
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Pump-probe on a DMI system, look at q vs time. Example: Pt/Co/W.
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Driven phase transition (metal-insulator?), after XAS experiment to determine right energy where we have maximum sensitivity.
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All-optical magnetic switching. See how it breaks into domains
- Mailing list: tr-scattering-scs@xfel.eu
X-ray holography
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Ultimate goal: image the spatial variation of the spin dynamics during ultrafast demagnetization with combined nm and fs resolution.
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Key to understand how angular momentum is dissipated at the ultrafast time scales, one of the open questions of modern condensed matter physics.
- Mailing list: holography-scs@xfel.eu
