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Article Dans Une Revue Optics Express Année : 2021

Sub-15-fs X-ray pump and X-ray probe experiment for the study of ultrafast magnetization dynamics in ferromagnetic alloys

Résumé

In this paper, we present a new setup for the measurement of element-specific ultrafast magnetization dynamics in ferromagnetic thin films with a sub-15-fs time resolution. Our experiment relies on a split and delay approach which allows us to fully exploit the shortest X-rays pulses delivered by X-ray Free Electrons Lasers (close to the attosecond range), in an X-ray pump – X-ray probe geometry. The setup performance is demonstrated by measuring the ultrafast elemental response of Ni and Fe during demagnetization of ferromagnetic Ni and Ni 80 Fe 20 (Permalloy) samples upon resonant excitation at the corresponding absorption edges. The transient demagnetization process is measured in both reflection and transmission geometry using, respectively, the transverse magneto-optical Kerr effect (T-MOKE) and the Faraday effect as probing mechanisms.
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Origine : Publication financée par une institution

Dates et versions

hal-03808361 , version 1 (14-10-2022)

Identifiants

Citer

Xuan Liu, Alaaeldine Merhe, Emmanuelle Jal, Renaud Delaunay, Romain Jarrier, et al.. Sub-15-fs X-ray pump and X-ray probe experiment for the study of ultrafast magnetization dynamics in ferromagnetic alloys. Optics Express, 2021, 29 (20), pp.32388. ⟨10.1364/OE.430828⟩. ⟨hal-03808361⟩
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