# Room Temperature Magnetoresistance and Exchange Bias in "314 - type" Oxygen-Vacancy Ordered SrCo$_{0.85}$Fe$_{0.15}$O$_{2.62}$

## TL;DR

This study reports room-temperature magnetoresistance and exchange bias effects in a layered oxygen-vacancy ordered SrCo0.85Fe0.15O2.62, highlighting its potential for magnetic sensor and spintronic applications.

## Contribution

It demonstrates for the first time the coexistence of magnetoresistance and exchange bias near room temperature in a

## Key findings

- Negative magnetoresistance of -1.3% at 295 K in 70 kOe
- 58% magnetoresistance at 4 K in 70 kOe
- Large exchange bias observed below 315 K

## Abstract

Herein, we report the magneto-transport and exchange bias effect in a "314 - type" oxygen - vacancy ordered material with composition SrCo$_{0.85}$Fe$_{0.15}$O$_{2.62}$. This material exhibits a ferrimagnetic transition above room temperature, at 315 K. The negative magnetoresistance starts to appear from room temperature (-1.3 $\%$ at 295 K in 70 kOe) and reaches a sizable value of 58 $\%$ at 4 K in 70 kOe. Large exchange bias effect is observed below 315 K when the sample is cooled in the presence of a magnetic field. The coexistence of nearly compensated and ferrimagnetic regions in the layered structure originate magnetoresistance and exchange bias in this sample. The appearance of a sizable magnetoresistance and giant exchange bias effect, especially near room temperature indicates that "314-type" cobaltates are a promising class of material systems for the exploration of materials with potential applications as magnetic sensors or in the area of spintronics.