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We examined the photo-induced dynamics of ferromagnetic Co/Pt thin filmsdemonstrating perpendicular magnetic anisotropy with element specificity usingresonant polar magneto-optical Kerr effect measurements at Pt~N${}_{6,7}$ andCo~M${}_{2,3}$ edges with an x-ray free electron laser. The obtained resultsshowed a clear element dependence of photo-induced demagnetization time scales:$\tau_\textrm{demag.}^\textrm{Co}=80\pm60~\textrm{fs}$ and$\tau_\textrm{demag.}^\textrm{Pt}=640\pm140~\textrm{fs}$. This dependence isexplained by the induced moment of the Pt atom by current flow from the Colayer through the interfaces. The observed magnetization dynamics of Co and Ptcan be attributed to the characteristics of photo-induced Co/Pt thin filmphenomena including all-optical switching.

Element-selective tracking ultrafast demagnetization process in Co/Pt multilayer thin films by the resonant magneto-optical Kerr effect