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 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

Journal Article · Mon Jan 17 23:00:00 EST 2022 · Applied Physics Letters

DOI:https://doi.org/10.1063/5.0076953· OSTI ID:1867501

^[1]; ^[2]; ^[3]; Liu, Tianmin ^[2]; Chen, Zhao ^[2]; ^[2]; Granitzka, Patrick W. ^[4]; Coslovich, Giacomo ^[5]; ^[5]; Dakovski, Georgi L. ^[5]; Schlotter, William F. ^[5]; ^[6]; Arenholz, Elke ^[6]; ^[7]; ^[8]; ^[8]; ^[5]; ^[3]; Stöhr, Joachim ^[5]; ^[9]

SLAC National Accelerator Lab., Menlo Park, CA (United States); European XFEL, Schenefeld (Germany)
SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
Stockholm Univ. (Sweden)
SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of Amsterdam (The Netherlands)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
HGST a Western Digital Company, San Jose, CA (United States); Chemnitz Univ. of Technology (Germany); Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
Eindhoven Univ. of Technology (The Netherlands)
SLAC National Accelerator Lab., Menlo Park, CA (United States); Uppsala Univ. (Sweden)

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.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-76SF00515; AC02-05CH11231

OSTI ID:: 1867501

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 3 Vol. 120; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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

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