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| Home > Publications database > Femtosecond charge and spin dynamics in a Co$_{50}$Pt$_{50}$ alloy |
| Journal Article | PUBDB-2025-00531 |
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2025
AIP Publishing LLC
Melville, NY
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Please use a persistent id in citations: doi:10.1063/4.0000297 doi:10.3204/PUBDB-2025-00531
Abstract: 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$_3$ 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.
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