X-ray Photon Fluctuation Spectroscopy on amorphous FeGe near magnetic phase transition at LCLS-II.*

Non-trivial magnetic spin textures, e.g. Skyrmions, have attracted attention lately due to their potential application in data storage and unique topological protection. Despite this, much is still unknown about the stabilization of these textures and how the symmetric (Hesienberg) and antisymmetric (Dzyaloshinskii-Moriya interaction) exchange couplings compete. In this talk, I present results from a recent experiment at LCLS-II where we probed sub-nanosecond time scales near the magnetic phase transition of amorphous FeGe. We investigated the transition between a helical and paramagnetic state, mediated by temperature. This work not only provides further insight into the competition between symmetric and antisymmetric exchange in chiral materials but also provides a blueprint for future sub-nanosecond experiments at X-ray Free Electron Lasers.