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TY - CONF AU - Riepp, M. AU - Bagschik, K. AU - Capotondi, F. AU - Frömter, R. AU - Golz, T. AU - Grübel, G. AU - Kiskinova, M. AU - Müller, L. AU - Naumenko, D. AU - Oepen, H.P. AU - Pedersoli, E. AU - Philippi-Kobs, A. AU - Roseker, W.R. AU - Rysov, R. AU - Stojanovic, N. AU - Walther, M. ED - Schaa, Volker R.W. ED - Decking, Winfried ED - Sinn, Harald ED - Geloni, Gianluca ED - Schreiber, Siegfried ED - Marx, Michaela TI - Ultrafast Magnetisation Dynamics at the Low-Fluence Limit Supported by External Magnetic Fields J2 - Proc. of FEL2019, Hamburg, Germany, 26-30 August 2019 CY - Hamburg, Germany T2 - Free Electron Laser Conference T3 - 39 LA - english AB - We report on ultrafast magnetisation dynamics in ferro-magnetic cobalt/platinum multilayers upon pumping by near and mid to far infrared radiation, utilizing sub-100 femtosecond free-electron laser pulses. The evolution of the excited magnetic state is studied on femtosecond timescales with nanometre spatial resolution and element selectivity, employing time-resolved magnetic small-angle X-ray scattering. The obtained results contribute to the ongoing discussion to what extent either coupling of the electromagnetic field or rather quasi-instantaneous heating of the electron-system is the driving force for phenomena like ultrafast demagnetization or all-optical helicity-dependent switching. PB - JACoW Publishing CP - Geneva, Switzerland SP - 574 EP - 577 KW - laser KW - scattering KW - radiation KW - FEL KW - electron DA - 2019/11 PY - 2019 SN - "" SN - 978-3-95450-210-3 DO - doi:10.18429/JACoW-FEL2019-THA04 UR - http://jacow.org/fel2019/papers/tha04.pdf ER -