Spin–orbit torque controlled stochastic oscillators with synchronization and frequency tunability

Stochastic oscillators based on emerging nanodevices are attractive because of their ultra-low power requirement and the ability to exhibit stochastic resonance, a phenomenon where synchronization weak input signals is enabled due ambient noise. In this work, low barrier nanomagnet-based oscillator demonstrated, whose output jumps spontaneously between two states by harnessing thermal noise, requiring no additional power. By utilizing spin–orbit torque in three-terminal device configuration, phase these periodic drives particular frequencies demonstrated. Experiments performed show tunability frequency controlling an electrical feedback parameter. The current required for more than eight times smaller that deterministic switching similar nanomagnetic devices. A model Kramers’ transition rate symmetric double well potential adopted dynamical simulations explain experimental results.