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In this work, we report on modelling results obtained with our recentlydeveloped simulation tool enabling nanoscopic description of electronicprocesses in X-ray irradiated ferromagnetic materials. With this tool, we havestudied the response of Co/Pt multilayer system irradiated by an ultrafastextreme ultraviolet pulse at the M-edge of Co (photon energy $\sim$ 60 eV). Itwas previously investigated experimentally at the FERMI free-electron-laserfacility, using the magnetic small-angle X-ray scattering technique. Oursimulations show that the magnetic scattering signal from cobalt decreases onfemtosecond timescales due to electronic excitation, relaxation and transportprocesses both in the cobalt and in the platinum layers, following the trendobserved in the experimental data. The confirmation of the predominant role ofelectronic processes for X-ray induced demagnetization in the regime below thestructural damage threshold is a step towards quantitative control andmanipulation of X-ray induced magnetic processes on femtosecond timescales.

Modeling of ultrafast X-ray induced magnetization dynamics in magnetic multilayer systems