A magnetic domain wall Mackey-Glass oscillator

We propose a time-delay oscillator using Mackey-Glass nonlinearity based on a pinned magnetic domain wall in a thin film nanostrip. Through spin transfer torques, electric currents applied along the strip cause the domain wall to deform and displace away from a geometrical pinning site, which can be converted into a nonlinear transfer function through a suitable choice of a readout. This readout serves as a delay signal, which is subsequently fed back into the applied current with amplification. With micromagnetics simulations, we study the role of the readout position, time delay, and feedback gain on the dynamics of this domain wall. In particular, we highlight regimes in which self-sustained oscillations and complex transients are possible.

Automated summary

In this study, a time-delay oscillator using Mackey-Glass nonlinearity based on a pinned magnetic domain wall in a thin film nanostrip is proposed. By applying electric currents along the strip, the domain wall is deformed and displaced through spin transfer torques, which can be converted into a nonlinear transfer function. Micromagnetics simulations are used to investigate the effects of readout position, time delay, and feedback gain on the dynamics of the domain wall, highlighting the potential for self-sustained oscillations and complex transients.