STUDY OF PARALLEL PUMPING OF MAGNETOELASTIC WAVES IN AN ANTIFERROMAGNETIC FEBO3

Parallel pumping of magnetoelastic waves in the sample of FeBO3 placed in a helix microwave resonator was studied. The resonator is shown to play an important role in the process of parametric excitation of qua siphonon pairs at once above the threshold of pumping. The phenomenon of coupled oscillations of electromagnetic mode of resonator and param etric pair of excited waves is investigated in detail. In order to get correct measurements of absorbed microwave power the equivalent circu it is proposed. We constructed the theory of parametric excitation of waves in nonlinear medium mounted in a resonator and obtained a good a greement with experimental data.