Abstract
The parametric excitation of spin-waves was studied in the easy-plane antiferromagnet MnCO3 at a microwave pumping frequency omega p/2 pi =33.8 GHz and T=1.6 K. The experiments were performed for oblique orientation of the magnetic field H with respect to the based plane of the crystal. The authors found that the two different microwave threshold fields for the appearance (hc1) and disappearance (hc2) of parametric excitation as well as the 'coefficient of hardness' kappa (hc1-hc2)/hc1 strongly depend on the angle theta between H and the basal plane, showing a decrease with increasing theta . The experimental results can be explained by the assumption that some part of the spin-wave relaxation and hardness effect arise from an interaction of spin-waves with 'orthogonal' magnetic impurities.
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