European XFEL Theory Seminar

Modeling of ultrafast X-ray induced demagnetization in magnetic multilayer systems

by Victor Tkachenko (IFJ PAN & European XFEL)

Europe/Berlin
Zoom meeting

Zoom meeting

Description

We report on the results obtained with the modeling tool constructed to follow ultrafast demagnetization induced by X-ray free-electron laser radiation in ferromagnetic materials. The tool includes nanoscopic description of all predominant processes occurring in the X-ray irradiated magnetic material on femtosecond timescales. 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 ∼ 60 eV), and (ii) Co/Pd multilayer system at the L-edge of Co (photon energy ∼ 778 eV). Our results show that the magnetic scattering signal from these systems decreases with time as a result of their progressing demagnetization, which is due to the electronic excitation and relaxation processes both in the cobalt and in the platinum/palladium layers. The decrease becomes stronger with the increasing fluence of the incoming radiation, following accurately the trends observed in the experimental data.

 

Host: Nils Brouwer

Join zoom meeting:

https://xfel.zoom.us/j/97291157722?pwd=STQzUGliWWFWSXd1NkI5bysrVHlLdz09
 
Meeting ID: 972 9115 7722
Passcode: 971074