Abstract
A theory of spin wave parametric instability is developed that simultaneously allows for cubic anisotropy and first- and second-order uniaxial anisotropies. The contributions of various anisotropies to a dispersion relation and first-and second-order nonlinearity coefficients are considered. A technique for studying the parametric instability of oscillations in magnetostatic resonators that relies on measuring their Q factors is proposed. Measuring data are used to determine the relaxation frequencies of parametrically excited spin waves in yttrium iron garnet films at frequencies close to 1 GHz. It is shown that a nonlinearity in the bias dependence of the spin wave frequencies should be allowed for in studying the relaxation parameters of ferrites.
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Original Russian Text © M.A. Popov, I.V. Zavislyak, 2008, published in Zhurnal Tekhnicheskoĭ Fiziki, 2008, Vol. 78, No. 4, pp. 82–88.
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Popov, M.A., Zavislyak, I.V. Parametric excitation of spin waves in a nonlinear magnetostatic resonator. Tech. Phys. 53, 472–478 (2008). https://doi.org/10.1134/S1063784208040130
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DOI: https://doi.org/10.1134/S1063784208040130