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

Journal Article · Mon May 11 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4921002· OSTI ID:22399042

Cunha, R. O. ^[1]; Holanda, J.; Azevedo, A.; Vilela-Leão, L. H. ^[1]; Rodríguez-Suárez, R. L. ^[2]

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1. Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, PE (Brazil)
2. Facultad de Física, Pontificia Universidad Católica de Chile, Casilla 306, Santiago (Chile)

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.

• OSTI ID: 22399042
• Journal Information: Applied Physics Letters, Vol. 106, Issue 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

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