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

Autor: Guyader, Loïc Le, 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.
Rok vydání: 2021
Předmět:
Druh dokumentu: Working Paper
DOI: 10.1063/5.0076953
Popis: 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.
Comment: 10 pages, 4 figures. The following article has been submitted to Applied Physics Letters. After it is published, it will be found at https://publishing.aip.org/resources/librarians/products/journals/
Databáze: arXiv