Suppression of stochasticity in high-speed domain-wall motion of synthetic antiferromagnets

Abstract

We investigate the relationship between domain-wall (DW) speed and stochasticity in synthetic antiferromagnetic (SAF) structures. By measuring arrival-time distributions at various current densities and SAF compositions, we find that faster DW motion systematically reduces stochastic dispersion, leading to improved positional precision at high speeds. Measurements at speeds exceeding 100 m/s reveal that the stochastic dispersion in both time and position exhibits scaling relations with speed. This scaling behavior provides critical insight into the mechanisms governing DW control and offers practical guidelines for optimizing the reliability and performance of high-speed spintronic devices.