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Ultrafast magnetization dynamics probed with HHG time-resolved magneto-optics and spin-resolved ARPES
(University of Göttingen)
E1.173 (European XFEL building)
European XFEL building
Ultrashort extreme-ultraviolet pulses from high-harmonic generation (HHG) provide a powerful tool for novel experiments in the area of ultrafast materials science. The short-wavelength nature of these sources provide important information related to all electronic, magnetic, structural, and chemical properties of a solid. In our experiments, we use HHG-based magneto-optical and photoemission experiments to probe ultrafast carrier dynamics and photo-induced phase transitions in materials.
Using element-specific HHG magneto-optical techniques, we elucidate the role of photo-induced ultrafast spin currents in magnetic multilayer stacks and alloys, between the layers [1,2], and also between the different elemental subsystems as proposed by Sharma et al. [Dewhurst et al., Nano Letters 18, 1842 (2018)]. With the help of a HHG time-, spin-, and angle-resolved photoemission spectroscopy (spin-resolved trARPES), in the case of Co, we map the optically-induced transitions and the connected spin-dependent band structure response on femtosecond timescales . Here, we observe two distinct processes at work. At energies near the Fermi-level, the spin dynamics are predominantly driven by a redistribution of spin-polarized carriers. At higher binding energies >1 eV, quenching of the spin polarization exhibits transient band dynamics that can be unambiguously traced back to rapid band mirroring of the electronic states. Because band-mirroring is a strong indication of spin fluctuations, we conclude that optically driven femtosecond spin currents induce collective spin excitations on extremely fast timescales
 Turgut et al., PRL 110, 107201 (2013)
 Hofherr et al., PRB 96, 100403(R), (2017)
 Eich et al., Science Adv. 3, e1602094 (2017)