Magnetization dynamics under nonlinear ferromagnetic resonance conditions in a (111) film

The equation of motion of magnetization of a garnet ferrite (111) film is s olved numerically. It is shown that different regimes of the resonance prec ession of magnetization are realized depending on the bias and microwave fi elds; the regimes differ in amplitude and in the shape of their magnetizati on precession trajectories. In addition, bifurcations occur which lead to a n abrupt change in amplitude, to bistability, and to precession with a peri od that is a multiple of the microwave-field period. (C) 2001 MAIK "Nauka/I nterperiodica".