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

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/5.0076953· OSTI ID:1867501
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [2];  [2]; ORCiD logo [2];  [4];  [5]; ORCiD logo [5];  [5];  [5]; ORCiD logo [6];  [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [8]; ORCiD logo [5]; ORCiD logo [3];  [5]; ORCiD logo [9]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); European XFEL, Schenefeld (Germany)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
  3. Stockholm Univ. (Sweden)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of Amsterdam (The Netherlands)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  7. HGST a Western Digital Company, San Jose, CA (United States); Chemnitz Univ. of Technology (Germany); Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
  8. Eindhoven Univ. of Technology (The Netherlands)
  9. 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.

Research Organization:
SLAC National Accelerator Lab., 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, Vol. 120, Issue 3; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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