The excitation and relaxation of spin waves are analysed from the variations of the longitudinal magnetization which are detected by the corresponding Faraday rotation. Spinwaves are excited parametrically by parallel pumping at 10 GHz and the optical analysis is performed by using a laser light at 1.15 μm. A high sensitive optical detection, which uses a dual light beam differential system (resolution better than 3 × 10−2″ for the circular magnetic birefringence), is described. By comparing the parametric spin-wave amplitudes deduced from the microwave measurements to the amplitude of the total excited spin waves (parametric + intermediate + thermal magnons) given by Faraday rotation, quantitative informations are obtained on the dynamic processes of the magnons (transient and steadystate evolutions of the parametric and intermediate modes). Finally the present method is useful in order to determine the specific heat of magnetic samples from which the increase of the thermal spin-wave population during the r.f. excitation is deduced.
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Jamet et al. (1975) studied this question.
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