Chaotic Spin-Wave Solitons in Magnetic Film Feedback Rings

Chaotic spin-wave solitons in magnetic film active feedback rings were observed for the first time. At some ring gain level, one observes the self-generation of a single spin-wave soliton pulse in the ring. When the pulse circulates in the ring, its amplitude varies chaotically with time. Numerical simulations based on a gain-loss nonlinear Schrödinger equation reproduce the observed responses.

Figure 1

Power spectra for ring signals obtained at different ring gain ($G$).

Figure 2

Time-domain signal obtained at $G=2.5\mathrm{dB}$: (a)–(c) power profiles; (d)–(e) carrier waves. In (c), the circles show the actual data and the curve shows a hyperbolic secant squared function fit. The curves in (d) show the relative phase profiles of the corresponding pulses.

Figure 3

Chaotic characterization of time-domain ring signals.

Figure 4

Simulation results for chaotic spin-wave solitons.