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Researchers used ultrafast X-ray free electron laser (XFEL) pulses to study Co/Pd multilayers. They observed increased stimulated emission and reduced diffraction contrast, highlighting the need for better XFEL control.

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Area of Science:

  • Condensed Matter Physics
  • Ultrafast X-ray Science

Background:

  • Co/Pd multilayers are crucial for magnetic recording media.
  • Understanding their response to intense, ultrafast X-rays is key for advanced applications.

Purpose of the Study:

  • To investigate the dynamic response of Co/Pd multilayers to ultrafast X-ray free electron laser (XFEL) pulses.
  • To analyze the interplay between stimulated emission and diffraction contrast under varying XFEL pulse conditions.

Main Methods:

  • Utilized novel experimental schemes with ultrafast (2.5 fs and 25 fs) self-amplified spontaneous emission (SASE) pulses.
  • Employed increasing pulse intensities to probe the sample.
  • Applied a statistical pulse description coupled with optical Bloch equations for quantitative analysis.

Main Results:

  • Observed concurrent increase in forward stimulated emission and loss of out-of-beam diffraction contrast.
  • Demonstrated a clear dependence of the stimulated sample response on incident pulse intensity, coherence time, and energy jitter.
  • Validated experimental findings through theoretical modeling.

Conclusions:

  • The study underscores the sensitivity of Co/Pd multilayers to ultrafast X-ray parameters.
  • Highlights the critical need for enhanced control over X-ray free electron laser (XFEL) radiation properties for precise material studies.
  • Suggests implications for optimizing XFEL-based characterization techniques.