TY  - JOUR
AU  - Pavelka, Martin
AU  - Elhanoty, Mohamed
AU  - Wang, Ru-Pan
AU  - Marotzke, Simon
AU  - Brenner, Guenter
AU  - Dziarzhytski, Siarhei
AU  - Jana, Somnath
AU  - Engel, Dieter
AU  - van Korff Schmisin, Clemens
AU  - Gupta, Deeksha
AU  - Vaskivskyi, Igor
AU  - Amrhein, Tim
AU  - Thielemann-Kuehn, Nele
AU  - Weinelt, Martin
AU  - Knut, Ronny
AU  - Roensch-Schulenberg, Juliane
AU  - Schneidmiller, Evgeny Alexanrdovich
AU  - Schuessler-Langeheine, Christian
AU  - Beye, Martin
AU  - Pontius, Niko
AU  - Grånäs, Oscar
AU  - Duerr, Hermann
TI  - Femtosecond charge and spin dynamics in a Co<sub>50</sub>Pt<sub>50</sub> alloy
JO  - Structural dynamics
VL  - 12
IS  - 2
SN  - 2329-7778
CY  - Melville, NY
PB  - AIP Publishing LLC
M1  - PUBDB-2025-00531
SP  - 024303
PY  - 2025
N1  - Add the grant:Deutsche Forschungsgemeinschaft (DFG) Project-ID 328545488, TRR277
AB  - The use of advanced X-ray sources plays a key role in the study of dynamic processes in magnetically ordered materials. The progress in X-ray free electron lasers enables the direct and simultaneous observation of the femtosecond evolution of the electrons and spins through transient X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD). Such experiments allow us to resolve how the population of the valence states evolves in magnetic solids upon optical excitation. Here, we utilize the new FLASH2 helical afterburner undulator’s circularly polarized ultrashort soft X-ray pulses from the FLASH free-electron laser FLASH to study the femtosecond dynamics of a laser-excited CoPt alloy at the Co L<sub>3</sub> edge. We find a comparable demagnetization for lower electronic excitation of Co 3d-states in CoPt compared to previous measurements on CoPd. This points to a more efficient demagnetization depending on orbital hybridization and spin-orbit coupling between 3d and 4d or 5d elements in an alloys and multilayers.
LB  - PUB:(DE-HGF)16
C6  - pmid:40290413
UR  - <Go to ISI:>//WOS:001478387200002
DO  - DOI:10.1063/4.0000297
UR  - https://bib-pubdb1.desy.de/record/622851
ER  -