# Shape-dependence of the barrier for skyrmions on a two-lane racetrack

## TL;DR

This paper investigates how the shape of an added nanostrip influences the energy barrier for skyrmions in a two-lane racetrack, revealing shape-dependent potential heights but universal potential shapes, relevant for memory device design.

## Contribution

It provides a detailed analysis of how nanostrip shape affects skyrmion potential barriers, highlighting shape dependence of barrier height and shape universality for applications.

## Key findings

- Barrier is always repulsive when narrow
- Potential height depends strongly on nanostrip shape
- Potential shape is more universal regardless of shape

## Abstract

Single magnetic skyrmions are localized whirls in the magnetization with an integer winding number. They have been observed on nano-meter scales up to room temperature in multilayer structures. Due to their small size, topological winding number, and their ability to be manipulated by extremely tiny forces, they are often called interesting candidates for future memory devices. The two-lane racetrack has to exhibit two lanes that are separated by an energy barrier. The information is then encoded in the position of a skyrmion which is located in one of these close-by lanes. The artificial barrier between the lanes can be created by an additional nanostrip on top of the track. Here we study the dependence of the potential barrier on the shape of the additional nanostrip, calculating the potentials for a rectangular, triangular, and parabolic cross section, as well as interpolations between the first two. We find that a narrow barrier is always repulsive and that the height of the potential strongly depends on the shape of the nanostrip, whereas the shape of the potential is more universal. We finally show that the shape-dependence is redundant for possible applications.