Second-order spin-wave instability threshold in single-crystal yttrium-iron-garnet films under perpendicular pumping

Journal Article · Wed Jun 01 00:00:00 EDT 1988 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.340364· OSTI ID:5313413

Zhang, Y T; Patton, C E; Srinivasan, G

The second-order spin-wave instability threshold in yttrium-iron-garnet single-crystal thin films has been investigated under conditions of ferromagnetic resonance (FMR). The samples were (111) etched circular films of 500 ..mu..m diam and 5.1 ..mu..m thickness, grown on gadolinium gallium garnet substrates by liquid-phase epitaxy. The pulsed microwave power FMR absorption curves were measured by standard signal averaging techniques at 9.18 GHz and room temperature for three different perpendicular pumping configurations: (1) in-plane static field and out-of-plane microwave field, (2) mutually perpendicular in-plane static and microwave fields, and (3) out-of-plane static field and in-plane microwave field. The experimental results show that the upsweep and downsweep FMR curves for lower pulsed microwave powers at low duty cycle of 1% are identical, but there are foldover effects in the FMR profiles at higher powers. Theoretical expressions for the instability threshold for these three configurations were obtained by extending previous theories. The calculated thresholds are in good agreement with the experimental results for configurations (1) and (2). The results for configuration (3) indicate the presence of a true foldover effect, also consistent with instability theory.

• Research Organization: Department of Physics, Colorado State University, Fort Collins, Colorado 80523
• OSTI ID: 5313413
• Journal Information: J. Appl. Phys.; (United States), Vol. 63:11
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
IRON ALLOYS
FERROMAGNETIC RESONANCE
YTTRIUM ALLOYS
EXPERIMENTAL DATA
GARNETS
GHZ RANGE 01-100
MEDIUM TEMPERATURE
MONOCRYSTALS
THEORETICAL DATA
THIN FILMS
ALLOYS
CRYSTALS
DATA
FILMS
FREQUENCY RANGE
GHZ RANGE
INFORMATION
MAGNETIC RESONANCE
MINERALS
NUMERICAL DATA
OXYGEN COMPOUNDS
RESONANCE
SILICATES
SILICON COMPOUNDS
360104* - Metals & Alloys- Physical Properties