# Reversible oxygen vacancies doping in (La$_{0.7}$,Sr$_{0.3}$)MnO$_3$ microbridges by combined self-heating and electromigration

## TL;DR

This paper demonstrates a reversible method to control oxygen vacancies in LaSrMnO3 microbridges using combined self-heating and electromigration, enabling rapid switching between metallic and insulating states.

## Contribution

It introduces a novel approach combining electric fields and Joule heating to reversibly manipulate oxygen vacancies in microbridges with fast response times.

## Key findings

- Reversible switching achieved in less than 1 second.
- Small voltages (<5 V) are sufficient for state changes.
- Multiple resistive states can be reliably set.

## Abstract

Combination of electric fields and Joule self-heating is used to change the oxygen stoichiometry and promote oxygen vacancy drift in a free-standing $\mathrm{(La,Sr)MnO_3}$ thin film microbridge placed in controlled atmosphere. By controlling the local oxygen vacancies concentration, we can reversibly switch our LSMO-based microbridges from metallic to insulating behavior on timescales lower than 1 s and with small applied voltages (<5 V). The strong temperature gradients given by the microbridge geometry strongly confine the motion of oxygen vacancies, limiting the modified region within the free-standing area. Multiple resistive states can be set by selected current pulses that determine different oxygen vacancies profiles within the device . Qualitative analysis of device operation is also provided with the support of Finite Element Analysis.