Dynamics of spin waves in parametric excitation by a stepped periodic magnetic field of arbitrary amplitude
A. A. ZvyaginPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovV. Ya. SerebryannyiPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovA. M. FrishmanPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovV. M. TsukernikPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kov
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A magnon system is investigated under conditions of paramagnetic excitation by a longitudinal periodic magnetic field with a rectangular waveform of arbitrary amplitude. In contrast to the customary resonance approximation, the calculated growth rate is finite, and for sufficiently large linear damping parametric instability does not set in for any pump field.
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