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

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

doi:10.1063/5.0076953

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

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

Research output: Contribution to journal › Article › Academic › peer-review

11 Citations (Scopus)

90 Downloads (Pure)

Abstract

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.

Original language	English
Article number	032401
Number of pages	6
Journal	Applied Physics Letters
Volume	120
Issue number	3
DOIs	https://doi.org/10.1063/5.0076953
Publication status	Published - 17 Jan 2022

Funding

L.L.G. acknowledges the Volkswagen-Stiftung for the financial support through the Peter-Paul-Ewald Fellowship. Work at SLAC and the operation of LCLS are supported by the U.S. Department of Energy, Office of Science. E.A. and P.S. were supported by the U.S. DOE Office of Science under Contract No. DE-AC02-05CH11231.

Funders	Funder number
U.S. Department of Energy
European Union's Horizon 2020 - Research and Innovation Framework Programme	715452

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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. (2022). State-resolved ultrafast charge and spin dynamics in [Co/Pd] multilayers. Applied Physics Letters, 120(3), Article 032401. https://doi.org/10.1063/5.0076953

@article{ec2f2e05c92a4ba8909987c356ce0b98,

title = "State-resolved ultrafast charge and spin dynamics in [Co/Pd] multilayers",

abstract = "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. ",

author = "\{Le Guyader\}, Lo{\"i}c and Higley, \{Daniel J.\} and Matteo Pancaldi and Tianmin Liu and Zhao Chen and Tyler Chase and Granitzka, \{Patrick W.\} and Giacomo Coslovich and Lutman, \{Alberto A.\} and Dakovski, \{Georgi L.\} and Schlotter, \{William F.\} and Padraic Shafer and Elke Arenholz and Olav Hellwig and Lalieu, \{Mark L.M.\} and Bert Koopmans and Reid, \{Alexander H.\} and Stefano Bonetti and Joachim St{\"o}hr and D{\"u}rr, \{Hermann A.\}",

note = "Publisher Copyright: {\textcopyright} 2022 Author(s).",

year = "2022",

month = jan,

day = "17",

doi = "10.1063/5.0076953",

language = "English",

volume = "120",

journal = "Applied Physics Letters",

issn = "0003-6951",

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Le Guyader, L, Higley, DJ, Pancaldi, M, Liu, T, Chen, Z, Chase, T, Granitzka, PW, Coslovich, G, Lutman, AA, Dakovski, GL, Schlotter, WF, Shafer, P, Arenholz, E, Hellwig, O, Lalieu, MLM, Koopmans, B, Reid, AH, Bonetti, S, Stöhr, J & Dürr, HA 2022, 'State-resolved ultrafast charge and spin dynamics in [Co/Pd] multilayers', Applied Physics Letters, vol. 120, no. 3, 032401. https://doi.org/10.1063/5.0076953

TY - JOUR

T1 - State-resolved ultrafast charge and spin dynamics in [Co/Pd] multilayers

AU - Le Guyader, Loïc

AU - Higley, Daniel J.

AU - Pancaldi, Matteo

AU - Liu, Tianmin

AU - Chen, Zhao

AU - Chase, Tyler

AU - Granitzka, Patrick W.

AU - Coslovich, Giacomo

AU - Lutman, Alberto A.

AU - Dakovski, Georgi L.

AU - Schlotter, William F.

AU - Shafer, Padraic

AU - Arenholz, Elke

AU - Hellwig, Olav

AU - Lalieu, Mark L.M.

AU - Koopmans, Bert

AU - Reid, Alexander H.

AU - Bonetti, Stefano

AU - Stöhr, Joachim

AU - Dürr, Hermann A.

PY - 2022/1/17

Y1 - 2022/1/17

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/85123756570

U2 - 10.1063/5.0076953

DO - 10.1063/5.0076953

M3 - Article

AN - SCOPUS:85123756570

SN - 0003-6951

VL - 120

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 3

M1 - 032401

ER -

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

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