Argonne National Laboratory

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X-ray Snapshots of Magnets and Liquids Using X-ray Free-Electron Lasers

Materials Science Colloquium
Christian Gutt, DESY, Germany
November 15, 2012 11:00AM to 12:00PM
Building 212, Room A157
X-ray free-electron laser sources provide extremely high-intensity and ultashort X-ray pulses which allow to access ultrafast phenomena in condensed matter on the nanoscale. In this talk I will report on results and future challenges of resonant magnetic scattering experiments using the FEL sources FLASH, LCLS and FERMI [1-3]. We investigated via IR pump / FEL probe experiments the ultrafast response of magnetic domain configurations in Co/Pt multilayer systems [4] to an optical pump-laser pulse.

First single-shot holography experiments have been performed at LCLS demonstrating the feasibility of imaging magnetic domains with fs X-ray pulses [3]. Further experiments focused on speckle correlations from disordered systems such as colloidal and atomic liquids. First results from hard X-ray scattering experiments will be presented [5] and future possibilities will be discussed.

[1] C. Gutt et al. Phys. Rev. B. 79, 212406 (2009).
[2] C. Gutt et al. Phys. Rev. B 81, 100401 (R) (2010).
[3] T. Wang et al. Phys. Rev. Lett. 108, 267403 (2012).
[4] B. Pfau et al. Nature Communications 3, 1100 (2012).
[5] C. Gutt et al. Phys. Rev. Lett 108, 024801 (2012).