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|September 14, 2020
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Summary

Investigating ultrafast magnetism, this study uses a novel x-ray scattering technique to probe electron dynamics in ultrathin magnetic films. Hot-electron transport and spin transport were found to be confined to below three nanometers.

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Area of Science:

  • Condensed matter physics
  • Ultrafast magnetism
  • Nanoscale science

Background:

  • Laser-driven electron dynamics in ultrathin magnetic films are crucial for ultrafast magnetism.
  • Experimental investigation of these nanoscopic, femtosecond processes remains challenging.

Purpose of the Study:

  • To develop and demonstrate a new scattering-based technique for investigating non-local magnetization dynamics.
  • To probe electron and spin transport on nanometer length and femtosecond timescales.

Main Methods:

  • Utilized a laser-induced electro- and magneto-optical grating in a Co/Pd ferromagnetic multilayer.
  • Employed tailored Al near-field masks with nanometer periodicities for spatially modulated excitation.
  • Performed x-ray scattering experiments with magnetic circular dichroism contrast at the FERMI free-electron laser.

Main Results:

  • Achieved sub-wavelength in-plane sensitivity for magnetic structures using a periodic excitation mask.
  • Observed a strongly enhanced and characteristic transient scattering response.
  • Inferred confinement of ultrafast lateral expansion to below three nanometers.

Conclusions:

  • The developed scattering technique provides unprecedented access to ultrafast non-local dynamics.
  • Hot-electron and spin transport in these systems are highly localized.
  • This method opens new avenues for studying nanoscale phenomena in magnetic materials.