# Tunable magnetic textures in spin valves: From spintronics to Majorana bound states

## TL;DR

This paper explores how spin-valve structures can generate controllable fringing magnetic fields to realize and manipulate Majorana bound states, bridging spintronics and topological quantum computing.

## Contribution

It introduces a method combining micromagnetic simulations with Bogoliubov de Gennes calculations to support the existence and control of Majorana bound states in spin valves.

## Key findings

- Fringing fields in spin valves can induce topologically nontrivial states.
- Micromagnetic simulations accurately predict magnetic configurations affecting MBS.
- A generalized condition for quantum phase transition guides MBS control.

## Abstract

Spin-valve structures in which a change of magnetic configuration is responsible for magnetoresistance have enabled impressive advances in spintronics, focusing on magnetically storing and sensing information. However, this mature technology also offers versatile control of the underlying fringing fields and entirely different applications by realizing topologically-nontrivial states. Together with proximity-induced superconductivity in a two-dimensional electron gas, these fringing fields realized in commercially-available spin valves could control Majorana bound states (MBS). Detailed support for the existence and control of MBS is obtained by combining accurate micromagnetic simulation of fringing fields used as an input in Bogoliubov de Gennes equation to calculate low-energy spectrum, wavefunction localization, and local charge neutrality. A generalized condition for quantum phase transition in these structures provides valuable guidance for the MBS evolution and implementing reconfigurable effective topological wires.