Verification of ultrafast spin transfer effects in FeNi alloys
arXiv:2306.02793 · doi:10.1038/s42005-024-01555-3
Abstract
The optical intersite spin transfer (OISTR) effect was recently verified in FeNi using magneto-optical Kerr measurements in the extreme ultraviolet range. However, one of the main experimental signatures analyzed in this work, namely a magnetic moment increase at a specific energy in Ni, was subsequently found also in pure Ni, where no transfer from one element to another is possible. Hence, it is a much-discussed issue whether OISTR in FeNi alloys is real and whether it can be verified experimentally or not. Here, we present a comparative study of spin transfer in FeNi, FeNi and pure Ni. We conclusively show that an increase in the magneto-optical signal is indeed insufficient to verify OISTR. However, we also show how an extended data analysis overcomes this problem and allows to unambiguously identify spin transfer effects. Concomitantly, our work solves the long-standing riddle about the origin of delayed demagnetization behavior of Ni in FeNi alloys.
References in corpus (8)
- Super-Diffusive Spin-Transport as a Mechanism of Ultrafast Demagnetization
- All-optical control of ferromagnetic thin films and nanostructures
- Temporal and spectral fingerprints of ultrafast all-coherent spin switching
- Influence of laser-excited electron distributions on the x-ray magnetic circular dichroism spectra: Implications for femtosecond demagnetization in Ni
- Distinct Ultrafast Electronic and Magnetic Response in M-edge Magnetic Circular Dichroism
- Optically controlling the competition between spin flips and intersite spin transfer in a Heusler half-metal on sub-100 fs timescales
- Unraveling Femtosecond Spin and Charge Dynamics with EUV T-MOKE Spectroscopy
- Experimental confirmation of the delayed Ni demagnetization in FeNi alloy