Tunable skyrmion Hall effect in elliptical antiferromagnetic skyrmions for high-speed logic

Abstract Antiferromagnetic (AFM) skyrmions are promising candidates for spintronic applications due to their high mobility and absence of the skyrmion Hall effect (SkHE) under current drive. However, the lack of SkHE also limits their utility in functional devices requiring transverse control. In this work, we demonstrate that in-plane magnetic anisotropy can stabilize elliptical AFM skyrmions as ground states, and we investigate their current-driven dynamics via spin–orbit torque. Combining micromagnetic simulations with an analytical Thiele equation approach, we show that the elliptical deformation induces a finite and tunable SkHE, characterized by a nonzero skyrmion Hall angle, which oscillates sinusoidally with the orientation of the in-plane easy axis. The transverse velocity emerges from nonzero off-diagonal components of the dissipative and driving tensors, which vanish only for specific alignments along the principal anisotropy axes. Furthermore, we quantify the confining potential exerted by nanostripe edges on the elliptical AFM skyrmion and determine a maximum boundary force. The tunability of the SkHE is further harnessed in a proof-of-concept 1-to-2 demultiplexer, which enables efficient routing of a single AFM skyrmion for high-speed logic. Our results provide a viable route to exploiting the SkHE in AFM skyrmions for reconfigurable logic and signal transmission devices.