Random bit generators based on skyrmions

Magnetic skyrmion are topologically protected non-uniform configuration of the magnetization which can behave as particles. They can be easily manipulated (nucleated, shifted and detected) by spin-polarized current, and for this reason they offer a wide range of applicability fields. In this work, we study the skyrmion dynamics driven by the spin-Hall effect in a synthetic antiferromagnet within a micromagnetic framework. We show that, in presence of thermal fluctuations at room temperature, the skyrmion motion is not deterministic. This feature, combined with a properly designed device, could be exploited for using skyrmions as building blocks of random bit generators.