Time-resolved study of nonlinear three-magnon processes in yttrium iron garnet films

H. J.Jason Liu, Grant A. Riley, César L. Ordóñez-Romero, Boris A. Kalinikos, Kristen S. Buchanan

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

In this work, the temporal aspects of two nonlinear spin-wave processes, i.e., three-magnon splitting and confluence, were investigated in a yttrium iron garnet film. Three-magnon splitting involves the conversion of a magnon at the microwave pumping frequency fp into two magnons, each with a frequency near fp/2, while confluence refers to the subsequent combination of two of the split magnons into one with frequency fc<fp. Time-resolved Brillouin scattering measurements confirm that these processes occur close to the driving antenna (<1.7mm away), which is expected. The data indicate, however, that magnons with larger group velocities are more likely to undergo confluence, which is not predicted by existing theory. Understanding the details of the splitting and confluence processes may have important implications for the use of short-wavelength spin waves for spintronic devices.

Original languageEnglish
Article number024429
JournalPhysical Review B
Volume99
Issue number2
DOIs
StatePublished - Jan 25 2019

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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