Abstract
A sample-size effect on spin wave auto-oscillations under parallel pumping is studied experimentally in tangentially magnetized rectangular samples of yttrium-iron garnet (YIG) films where one of the in-plane sizes is varied. A previously developed one-dimensional theoretical model of unstable collective oscillations in the system of parametrically excited spin waves is used to describe the mechanism of spin wave auto-oscillations observed in YIG films. Our results show that the one-dimensional model (that works well for YIG spheres) gives only qualitative description of the sample-size effect in YIG films and the incorporation of the second finite size (film thickness) in this model is needed to achieve quantitative agreement with experiment in the film geometry.
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