Ultrafast spin dynamics in FeNi alloys
von Christina Möller
Datum der mündl. Prüfung:2023-08-18
Erschienen:2023-11-17
Betreuer:Prof. Dr. Stefan Mathias
Gutachter:Prof. Dr. Stefan Mathias
Gutachter:Prof. Dr. Claus Ropers
Dateien
Name:Dissertation_Moeller_2023.pdf
Size:19.8Mb
Format:PDF
Zusammenfassung
Englisch
In this thesis, the optical intersite spin transfer in ferromagnetic FeNi alloys is studied on the femtosecond timescale. Extreme ultraviolet transverse magneto-optical Kerr effect spectroscopy (EUV T-MOKE) is used to characterize the spin transfer and its strength for different relative compositions of the alloy. In addition, our new method to extract the transient dielectric tensor is employed and disentangles the magnetic and optical contributions to the magneto-optical signal. This analysis turns out to be particularly critical for the interpretation of spin dynamics during the optically-induced non-equilibrium state.
Keywords: ultrafast magnetism; magneto-optical spectroscopy; extreme ultraviolet light; optical intersite spin transfer; femtosecond laser; dielectric tensor; transverse magneto-optical Kerr effect