Abstract
Abstract : An experimental and theoretical investigation was made of transverse pumping saturation effects in Zn2Y ferrite at frequencies far below ferromagnetic resonance. Chief interest was in saturation effects at frequencies below the bottom of the spin wave manifold, where the lowest order phonon instabilities were expected to compete favorably with the higher order spin wave instabilities. Measurements of saturation effects in single crystal Zn2Y , with the easy plane lying in the plane of the disk, were made at 1.32 kMc. The dc and rf magnetic fields were applied orthogonally in the plane of the disk. The large rf magnetic fields required were obtained by employing a strontium titanate dielectric resonator. In these experiments the order of the first resonant spin wave instability permitted was varied from the first to the fifth by adjusting the position of the spin wave manifold relative to the pump frequency. The nature of the saturation was investigated by observing the waveform of the reflected pump pulse. Theoretical on-resonance spin wave thresholds up to fourth order and off-resonance spin wave thresholds up to second order were derived. (Author)
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