Tuning of chaotic surface spin waves in a magnetic-film feedback ring via the ring gain

This paper reports on experimental data on the controlled tuning of chaotic surface spin waves in a magnetic-film active feedback ring. The chaotic behavior of these waves arises through three-wave nonlinear interactions. With a change in the ring gain, two chaotic regimes were observed. One corresponds to the situation where only one ring eigenmode was excited in the ring, while the other corresponds to the situation where two ring eigenmodes were excited. The correlation dimension and autocorrelation function (ACF) properties of the chaotic wave in each regime strongly depend on the level of the ring gain, and this gain dependence differs from one regime to the other. The shift between the two regimes was not a smooth transition. In particular, one observed a sharp change in both the correlation dimension and the distance of the side ACF peaks to the main ACF peak.