Co-doped (La,Sr)TiO3-d: a high-Curie temperature diluted magnetic system with large spin-polarization

TL;DR

This paper demonstrates significant spin polarization in Co-doped (La,Sr)TiO3-d, a high-Curie temperature diluted magnetic oxide, through tunneling magnetoresistance experiments on magnetic tunnel junctions, confirming its intrinsic ferromagnetism.

Contribution

It provides experimental evidence of high spin polarization and intrinsic ferromagnetism in Co-doped (La,Sr)TiO3-d, supporting its potential in spintronics applications.

Findings

High spin polarization confirmed in Co-LSTO

Intrinsic ferromagnetism without Co clustering

Potential for spintronic device applications

Abstract

We report on tunneling magnetoresistance (TMR) experiments that demonstrate the existence of a significant spin polarization in Co-doped (La,Sr)TiO3-d (Co-LSTO), a ferromagnetic diluted magnetic oxide system (DMOS) with high Curie temperature. These TMR experiments have been performed on magnetic tunnel junctions associating Co-LSTO and Co electrodes. Extensive structural analysis of Co-LSTO combining high-resolution transmission electron microscopy and Auger electron spectroscopy excluded the presence of Co clusters in the Co-LSTO layer and thus, the measured ferromagnetism and high spin polarization are intrinsic properties of this DMOS. Our results argue for the DMOS approach with complex oxide materials in spintronics.