Parametric Excitation of Acoustic Wave Instabilities in Ferromagnets

摘要

Experimental measurements of saturation effects in single‐crystal Zn2Y, with the easy plane lying in the plane of the disk, have been observed experimentally at 1.3 G/sec—below the bottom of the spin‐wave manifold. Thresholds observed are comparable with theoretical predictions based upon the assumption of the magnetoelastic pumping effect as the dominant mechanism. In these experiments the order of the first resonant spin‐wave instability permitted has been varied from the second to the fifth by adjusting the position of the spin‐wave manifold relative to the pump frequency.