Here’s a challenge from Steve Mould: Can you design a spintronic equivalent of Chua’s circuit?

Chua’s circuit is a cool little circuit designed fairly recently, in 1983. It’s the simplest circuit that generates chaos. It oscillates, but not at a defined frequency. In fact, it’s just the opposite: It’s a **nonperiodic oscillator**.

As you can see from the Wikipedia article, the only unusual part it needs is a nonlinear element (N_{R} in the image above). Well, as you might have noticed, our transistor isn’t particularly linear. That is, the resistance of the path isn’t directly proportional to the voltage applied to the gate.

So the challenge is this: can you make the spintronic equivalent of Chua’s circuit OR can you make any sort of other nonperiodic oscillator?