# Transmission of charge and spin in a topological-insulator-based magnetic structure

## TL;DR

This paper investigates how a magnetic thin-film ribbon on a topological insulator surface affects charge and spin transport, revealing oscillatory conductance and thermoelectric properties due to electron interference effects.

## Contribution

It provides a theoretical analysis of charge and spin transport in topological insulators with magnetic ribbons, including conductance oscillations and thermoelectric behavior.

## Key findings

- Conductance oscillates with the length of the magnetic region.
- Magnetic ribbons create a gap in surface electron spectrum.
- Seebeck coefficient is affected by temperature gradients.

## Abstract

We discuss the effect of a magnetic thin-film ribbon at the surface of a topological insulator on the charge and spin transport due to surface electrons.\\ If the magnetization in the magnetic ribbon is perpendicular to the surface of a topological insulator, it leads to a gap in the energy spectrum of surface electrons. As a result, the ribbon is a barrier for electrons, which leads to electrical resistance.\\ We have calculated conductance of such a structure. The conductance reveal some oscillations with the length of the magnetized region due to the interference of transmitted and reflected waves. We have also calculated the Seebeck coefficient when electron flux is due to a temperature gradient.