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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 2: Light Sources and Diagnostics

K 2.2: Talk

Thursday, September 2, 2021, 14:15–14:30, H2

Modeling of ultrafast X-ray induced demagnetization in magnetic multilayer systems — •Beata Ziaja-Motyka — CFEL, DESY, Notkestrasse 85,22607 Hamburg,Germany — INP PAN, Radzikowskiego 152, 31-342 Krakow, Poland

Here we report on the results obtained with the modeling tool, XSPIN constructed to describe ultrafast demagnetization induced by X-ray free-electron laser radiation in ferromagnetic materials. The tool enables nanoscopic description of the predominant processes occurring in the X-ray irradiated magnetic material. With this model, we have studied the evolution of magnetic multilayer systems previously investigated experimentally with magnetic small angle X-ray scattering technique: (i) Co/Pt multilayer at the M-edge of Co (photon energy of 60 eV), and (ii) Co/Pd multilayer system at the L-edge of Co (photon energy of 778 eV). Our results show that the magnetic scattering signal decreases with time as the result of its progressing demagnetization due to electronic excitation and relaxation processes both in the cobalt and in platinum/palladium layers. The decrease becomes stronger with the increasing fluence of the incoming radiation, following accurately the trends observed in the experimental data.