  The authors demonstrate the use of a propagating spin waves for implementing
a reservoir computing architecture. The proposed concept utilises an active
ring resonator comprising a magnetic thin film delay line integrated into a
feedback loop. These systems exhibit strong nonlinearity and delayed response
behaviour, two important properties required for an effective reservoir
computing implementation. In a simple design, we exploit the nonlinear damping
of spin waves at different feedback gains to inject input data into the active
ring resonator and use a microwave diode to read out the amplitude of the spin
waves circulating in the ring. We employ two baseline tasks, namely the short
term memory and parity check tasks, to evaluate the suitability of this
architecture for processing time series data.
