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.
DOIAbstract
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 unoccupied 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
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