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Femtosecond Laser Pulse Driven Caustic Spin Wave Beams.

S Muralidhar1, R Khymyn1, A A Awad1

  • 1Physics Department, University of Gothenburg, 412 96 Gothenburg, Sweden.

Physical Review Letters
|February 5, 2021
PubMed
Summary

Researchers controlled spin wave direction using light and magnetic fields. This demonstrates a method for designing magnonic devices with tunable spin wave propagation patterns.

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Area of Science:

  • Condensed matter physics
  • Quantum information science
  • Nanotechnology

Background:

  • Controlling spin wave directionality is crucial for developing wave-based computing, particularly in magnonics.
  • All-optical methods offer precise control over spin wave generation and manipulation.

Purpose of the Study:

  • To demonstrate control over spin wave directionality using an all-optical source.
  • To investigate the influence of magnetic fields on spin wave propagation patterns.

Main Methods:

  • Utilized an all-optical pointlike source based on frequency comb rapid demagnetization to generate continuous spin waves.
  • Applied a detuning magnetic field relative to the ferromagnetic resonance (FMR) to alter spin wave propagation.

Main Results:

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  • Observed X-shaped caustic spin wave patterns at 70° propagation angles, consistent with theoretical predictions.
  • Demonstrated a transition from caustic patterns to uniaxial spin wave propagation by tuning the light source harmonic near FMR.
  • Showcased field-controlled propagation patterns and directionality of optically emitted short-wavelength spin waves.

Conclusions:

  • Optically generated spin waves exhibit controllable directionality through magnetic field manipulation.
  • The observed phenomena provide new degrees of freedom for designing advanced magnonic devices.
  • This work advances the fundamental understanding and practical application of spin waves in computing.