Subsidiary Resonance in the Coincidence Region in Yttrium Iron Garnet
1960; American Institute of Physics; Volume: 31; Issue: 12 Linguagem: Inglês
10.1063/1.1735536
ISSN1520-8850
Autores Tópico(s)Quantum optics and atomic interactions
ResumoThe measurement of hcrit, the threshold rf field for subsidiary resonance, as a function of frequency throughout the coincidence region, and the behavior of μ″max at rf fields exceeding hcrit are presented for a single-crystal yttrium iron garnet sphere at room temperature. The sphere has a linewidth of 480 moe measured at 3000 Mc. The hcrit curve obtained was quite flat at approximately 0.3 moe from 2000 Mc to 3300 Mc and increased by more than a factor of 6 within 150 Mc of either end; a much more sudden increase than was the case for previously measured spheres of wider linewidth. The measured curve is compared to a curve computed from Suhl's theory of subsidiary resonance at high power levels, and the effects of the linewidths ΔH and ΔHk on the shape of the curve are considered. The variation of μ″max with rf power above the threshold followed Suhl's P−½ law rather closely for frequencies above 2700 Mc but exhibited fine structure and a slower fall-off for frequencies below.
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