Rotating edge-field driven processing of chiral spin textures in racetrack devices

TL;DR

This paper introduces a novel method for manipulating topological magnetic structures in racetrack devices using local boundary rotations, eliminating the need for global currents or fields, thus enabling energy-efficient 3D designs.

Contribution

It demonstrates a new approach to control magnetic textures in racetrack memories through local boundary rotations, avoiding high current densities and enhancing energy efficiency.

Findings

Local boundary rotations can create and move magnetic textures over long distances.

The method reduces the need for high current densities in racetrack devices.

Compatibility with 3D energy-efficient device architectures is achieved.

Abstract

Topologically distinct magnetic structures like skyrmions, domain walls, and the uniformly magnetized state have multiple applications in logic devices, sensors, and as bits of information. One of the most promising concepts for applying these bits is the racetrack architecture controlled by electric currents or magnetic driving fields. In state-of-the-art racetracks, these fields or currents are applied to the whole circuit. Here, we employ micromagnetic and atomistic simulations to establish a concept for racetrack memories free of global driving forces. Surprisingly, we realize that mixed sequences of topologically distinct objects can be created and propagated over far distances exclusively by local rotation of magnetization at the sample boundaries. We reveal the dependence between the chirality of the rotation and the direction of propagation and define the phase space where the proposed procedure can be realized. The advantages of this approach are the exclusion of high current and field densities as well as its compatibility with an energy-efficient three-dimensional design.