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

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 freque...

Full description

Saved in:
Bibliographic Details
Published in:Physical review. B 2019-01, Vol.99 (2), p.1
Main Authors: Jason Liu, H J, Riley, Grant A, Ordóñez-Romero, César L, Kalinikos, Boris A, Buchanan, Kristen S
Format: Article
Language:English
Subjects:
Iron
Magnons
Splitting
Yttrium
Yttrium-iron garnet
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 (< 1.7 mm 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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.99.024429