skip to main content

SciTech ConnectSciTech Connect

Title: Nonlinear dynamics of three-magnon process driven by ferromagnetic resonance in yttrium iron garnet

We report an investigation of the dynamics of the three-magnon splitting process associated with the ferromagnetic resonance (FMR) in films of the insulating ferrimagnet yttrium iron garnet (YIG). The experiments are performed with a 6 μm thick YIG film close to a microstrip line fed by a microwave generator operating in the 2–6 GHz range. The magnetization precession is driven by the microwave rf magnetic field perpendicular to the static magnetic field, and its dynamics is observed by monitoring the amplitude of the FMR absorption peak. The time evolution of the amplitude reveals that if the frequency is lowered below a critical value of 3.3 GHz, the FMR mode pumps two magnons with opposite wave vectors that react back on the FMR, resulting in a nonlinear dynamics of the magnetization. The results are explained by a model with coupled nonlinear equations describing the time evolution of the magnon modes.
Authors:
 [1] ;  [2] ; ; ;  [1] ;  [1] ;  [2] ;  [3]
  1. Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, PE (Brazil)
  2. (Brazil)
  3. Facultad de Física, Pontificia Universidad Católica de Chile, Casilla 306, Santiago (Chile)
Publication Date:
OSTI Identifier:
22399042
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; FERRIMAGNETIC MATERIALS; FERRIMAGNETISM; FERRITE GARNETS; FERROMAGNETIC RESONANCE; FILMS; GHZ RANGE; IRON OXIDES; MAGNETIC FIELDS; MAGNETIZATION; MAGNONS; MICROWAVE RADIATION; NONLINEAR PROBLEMS; PRECESSION; YTTRIUM COMPOUNDS