State-resolved ultrafast charge and spin dynamics in [Co/Pd] multilayers
- 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.
- 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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Related Subjects
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
X-ray absorption spectroscopy
Microchannel plate detectors
Ferromagnetic materials
X-ray magnetic circular dichroism spectroscopy
Spin-orbit interactions
Transient-absorption spectroscopy
Ultrafast pump probe spectroscopy
Charge dynamics
Femtosecond lasers
Spintronics
X-ray absorption spectroscopy
Microchannel plate detectors
Ferromagnetic materials
X-ray magnetic circular dichroism spectroscopy
Spin-orbit interactions
Transient-absorption spectroscopy
Ultrafast pump probe spectroscopy
Charge dynamics
Femtosecond lasers
Spintronics