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Area of Science:

  • Condensed Matter Physics
  • Quantum Information Science
  • Materials Science

Background:

  • Nonlinear magnonics involves high-frequency magnons splitting into lower-frequency ones.
  • This process conserves linear momentum and is crucial for understanding spin dynamics.
  • Previous studies focused on local interactions, limiting exploration of spatial effects.

Purpose of the Study:

  • To experimentally observe and characterize nonlocal three-magnon scattering.
  • To investigate magnon interactions between spatially separated magnetic systems.
  • To explore the potential for quantum entanglement applications using nonlocal magnon propagation.

Main Methods:

  • Utilized a CoFeB nanowire and a yttrium iron garnet (YIG) thin film as distinct magnetic systems.
  • Applied microwave fields to induce Kittel magnons in the CoFeB nanowire.
  • Detected induced voltage signals in platinum electrodes on the YIG film, indicating nonlocal magnon scattering.
  • Employed model calculations based on interlayer dipolar interaction for validation.

Main Results:

  • Successfully observed nonlocal three-magnon scattering where a CoFeB magnon split into two counterpropagating YIG magnons.
  • The excited YIG magnons were primarily in the first excited (n=1) perpendicular standing spin-wave mode.
  • Observed subsequent scattering of n=1 magnons into nodeless (n=0) magnons via a four-magnon process at higher power.
  • Experimental results showed excellent agreement with theoretical model calculations.

Conclusions:

  • Demonstrated the first experimental evidence of nonlocal three-magnon scattering between separated magnetic systems.
  • The findings confirm the role of interlayer dipolar interaction in mediating nonlocal magnon dynamics.
  • This nonlocal magnon detection opens possibilities for generating quantum entanglement between distant magnons for quantum information processing.