SPIN WAVE ANISOTROPY IN PARALLEL PUMPING EXPERIMENTS ON YIG

A theoretical and experimental investigation of magnetic anisotropy effects on spin wave excitation in parallel pumping experiments has been conducted. The experiments were performed at Xband frequencies on single crystal yttrium iron garnet. Anisotropy is introduced into the framework of existing t...

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Bibliographic Details
Main Authors: Sethares, James C, Seavey, Marden H , Jr, Stiglitz, Martin R
Format: Report
Language:English
Subjects:
ANISOTROPY
EQUATIONS
EXCITATION
FERRITES
GARNET
IRON
MICROWAVES
MOTION
PHONONS
PROPAGATION
SPECTRUM ANALYZERS
SYMMETRY(CRYSTALLOGRAPHY)
TEMPERATURE
X BAND
YTTRIUM
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Summary:A theoretical and experimental investigation of magnetic anisotropy effects on spin wave excitation in parallel pumping experiments has been conducted. The experiments were performed at Xband frequencies on single crystal yttrium iron garnet. Anisotropy is introduced into the framework of existing theory. The spin wave dispersion relation and instability thresholds for pumping in a (110) crystallographic direction are derived. A number of experimental butterfly curves for various temperatures, crystallographic orientations, and geometries are obtained and compared with the theoretical predictions. A new effect, experimentally observable as an extra corner on the butterfly curves (separate from the phonon peaks), is shown to be directly related to the anisotropy produced splitting of the top of the spin wave band. (Author)