Magnetic $2\pi$ domain walls for tunable Majorana devices

TL;DR

This paper proposes that magnetic 2π domain walls in magnetic ribbons on superconductors can create controllable topological superconducting wires with Majorana bound states, offering a practical platform for Majorana-based quantum devices.

Contribution

It introduces a simple, experimentally feasible method to generate and manipulate Majorana states using magnetic 2π domain walls in hybrid devices.

Findings

Magnetic 2π domain walls can host Majorana bound states at ribbon edges.

Properly tuned parameters produce topological quasi-1D superconducting wires.

Magnetic domain walls are easily created and controlled with existing techniques.

Abstract

Identifying realistic platforms capable of controlled operations with Majorana bound states is a key challenge in the study of topological superconductivity. Among the most promising proposals are magnet-superconductor hybrid devices, which employ magnetic textures to engineer regions of non-trivial topology. Here, we consider the remarkably simple case of $2\pi$ domain walls in a magnetic ribbon placed on a superconducting substrate. We show that for properly chosen parameters, such domain walls generate topological quasi-one dimensional superconducting wires and give rise to localized Majorana bound states at the ribbon edges. Magnetic $2\pi$ domain walls are easily created and controlled with existing experimental techniques, thus providing a versatile platform for Majorana manipulations.