<i>Ab Initio</i> Study of Helicity-Dependent Light-Induced Demagnetization: From the Optical Regime to the Extreme Ultraviolet Regime

We use ab initio real-time time-dependent density functional theory to investigate the effect of optical and extreme ultraviolet (XUV) circularly polarized femtosecond pulses on magnetization dynamics ferromagnetic materials. demonstrate that light induces a helicity-dependent reduction magnitude magnetization. In XUV regime, where 3p semicore states are involved, larger helicity dependence persisting even after passage is exhibited. Finally, we were able separate part due absorption from inverse Faraday effect. Doing so, show former has, overall, greater impact than latter, especially pulse in regime. This work hints at yet experimentally unexplored territory light-induced dynamics, which, according our prediction, could magnify already exhibited