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Nonlinear multi-magnon scattering in artificial spin ice.

Sergi Lendinez1,2, Mojtaba T Kaffash1, Olle G Heinonen3,4

  • 1Department of Physics and Astronomy, University of Delaware, Newark, DE, 19716, USA.

Nature Communications
|June 9, 2023
PubMed
Summary
This summary is machine-generated.

Nonlinear magnon scattering, previously thought limited to thin films, is now observed in artificial spin ice nanostructures. This discovery opens possibilities for tunable directional scattering in magnetic metamaterials.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Nanotechnology

Background:

  • Magnons are fundamental excitations in magnetic solids, behaving as bosons.
  • Parametric magnon processes (Suhl instabilities) were believed to require continuous magnon bands found in thin films.

Purpose of the Study:

  • To investigate nonlinear magnon-magnon scattering and coherence in artificial spin ice.
  • To determine if artificial spin ice exhibits scattering phenomena similar to continuous magnetic films.

Main Methods:

  • Combined microwave and microfocused Brillouin light scattering measurements.
  • Numerical simulations to analyze scattering events and frequency doubling.

Main Results:

  • Artificial spin ice exhibits nonlinear magnon-magnon scattering, similar to continuous films.
  • Scattering events are linked to nanomagnet properties (mode volume and profile).
  • Frequency doubling occurs via nanomagnets acting as nanosized antennas.

Conclusions:

  • Nonlinear magnon scattering is achievable in discrete magnetic nanostructures.
  • Artificial spin ice provides a platform for tunable directional magnon scattering.
  • This research expands the understanding of magnonic phenomena beyond continuous films.