State-resolved ultrafast charge and spin dynamics in [Co/Pd] multilayers

Le Guyader, Loïc; Higley, Daniel J.; Pancaldi, Matteo; Liu, Tianmin; Chen, Zhao; Chase, Tyler; Granitzka, Patrick W.; Coslovich, Giacomo; Lutman, Alberto A.; Dakovski, Georgi L.; Schlotter, William F.; Shafer, Padraic; Arenholz, Elke; Hellwig, Olav; Lalieu, Mark L. M.; Koopmans, Bert; Reid, Alexander H.; Bonetti, Stefano; Stöhr, Joachim; Dürr, Hermann A.

doi:10.1063/5.0076953

State-resolved ultrafast charge and spin dynamics in [Co/Pd] multilayers

Le Guyader, L.; Higley, D. J.; Pancaldi, M.; Liu, T.; Chen, Z.; Chase, T.; Granitzka, P. W.; Coslovich, G.; Lutman, A. A.; Dakovski, G. L.; Schlotter, W. F.; Shafer, P.; Arenholz, E.; Hellwig, O.; Lalieu, M. L. M.; Koopmans, B.; Reid, A. H.; Bonetti, S.; Stöhr, J.; Dürr, H. A.

We use transient absorption spectroscopy with circularly polarized x-rays to detect laser-
excited hole states below the Fermi level and compare their dynamics with that of unoc-
cupied states above the Fermi level in ferromagnetic [Co/Pd] multilayers. While below
the Fermi level an instantaneous and significantly stronger demagnetization is observed,
above the Fermi level the demagnetization is delayed by 35 ± 10 fs. This provides a direct
visualization of how ultrafast demagnetization proceeds via initial spin-flip scattering of
laser-excited holes to the subsequent formation of spin waves

Applied Physics Letters 120(2022), 032401
DOI: 10.1063/5.0076953
Cited 8 times in Scopus

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