DELAYED BIFURCATIONS AT THE FIRST-ORDER SUHL THRESHOLD

In this paper, we present both theoretical and experimental analysis o f delayed dynamic bifurcations as could be observed by ferromagnetic r esonance (FMR) on an yttrium iron garnet (YIG) sphere. In Sec. 1 the s tatic bifurcation behaviour of the first-order Suhl instability is ana lyzed in terms of a two-mode model, which represents the simplest poss ible description of this process. In Sec. 2 our analytical results are extended to the dynamic case by means of numerical simulations, inclu ding the influence of noise. We present our experimental results and c ompare them with the obtained theoretical predictions.