Skyrmion motion in magnetic anisotropy gradients: Acceleration caused by deformation

Abstract

Skyrmions in weak parameter gradients behave similarly to current-driven skyrmions, moving uniformly along a fixed skyrmion Hall angle relative to the current direction. This study reveals a distinct type of motion that becomes relevant for large parameter gradients: skyrmions undergo significant profile changes, resulting in a nonuniform motion. They accelerate and follow curved trajectories. Leveraging this insight, the authors introduce novel strategies for suppressing the skyrmion Hall effect, both parallel and perpendicular to the gradient direction.

Topics & Concepts