Orateur
Description
Interaction of light with matter triggers a cascade of processes spanning a timescale of many order of magnitudes. By studying the dynamics occurring in magnetic alloys on the very early time period of this interaction (femtosecond timescale) we want to obtain novel experimental data, with unprecedented time resolution, and shed light on the different contributions (local and non-local) responsible for the demagnetization occurring during this highly off equilibrium phase.
To realize this goal, we have developed an innovative experimental approach to study charge and spin dynamics in solids with sub 5 fs time resolution. We exploit the shortest X-ray pulses generated at X-ray free electrons laser (XFEL), with a pulse duration down to a few femtosecond, to implement an X-ray pump – X-ray probe, jitter free stroboscobic experiment. We will show the first results obtained at the XFEL FLASH in Hamburg, already showing a time resolution shorter than 10 fs.
Further results obtained with this setup will have a significant impact on the field of femtomagnetism. Indeed, truly time resolving for the first time the first few to tens of femtoseconds following the interaction between a light pulse and a magnetic material is key to disentangle the contributions of the different microscopic processes participating in this complex interaction.
| Choix de session parallèle | 6.4 Résultats scientifiques récents obtenus avec les XFEL |
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