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Deeply Nonlinear Magnonic Directional Coupler.

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  • 1School of Physics, Hubei Key Laboratory of Gravitation and Quantum Physics, Institute for Quantum Science and Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China.

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Summary
This summary is machine-generated.

Magnonic directional couplers exhibit power-dependent behavior due to nonlinear frequency shifts. This phenomenon enables a switchable directional coupler for advanced magnonic circuits.

Keywords:
Deeply nonlinear spin wavesMagnonic directional couplerMagnonic logic circuitsNonlinear frequency shiftNonlinearity-induced decoupling

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Dipolar coupling in magnetic waveguides forms the basis of magnonic directional couplers.
  • These couplers function as essential components like signal combiners and power splitters in magnonic circuits.
  • Existing designs leverage wavelength-dependent coupling and weak nonlinearities for power-dependent characteristics.

Purpose of the Study:

  • To investigate a novel nonlinear phenomenon in magnonic directional couplers driven by spin-wave nonlinear frequency shift.
  • To explore how strong nonlinear frequency shifts can suppress energy transfer between waveguides.
  • To design and validate a switchable directional coupler based on this nonlinear effect for potential high-frequency applications.

Main Methods:

  • Theoretical exploration of nonlinear spin-wave dynamics in coupled magnetic waveguides.
  • Analysis of the impact of nonlinear frequency shift on energy transfer efficiency.
  • Micromagnetic simulations to validate the designed switchable directional coupler's performance.

Main Results:

  • A strong nonlinear frequency shift effectively suppresses energy transfer, mimicking nonidentical waveguides.
  • The transition from complete to negligible energy transfer shows sharp threshold behavior.
  • Critical power for this transition is dependent on coupling strength and nonlinear frequency shift parameters.

Conclusions:

  • Nonlinear frequency shift offers a distinct mechanism for controlling energy transfer in magnonic directional couplers.
  • A switchable directional coupler design based on this principle has been successfully validated.
  • This approach holds promise for developing higher-frequency magnonic circuits and devices.