Theory of carrier mediated ferromagnetism in dilute magnetic oxides

TL;DR

This paper investigates the mechanisms behind high-temperature ferromagnetism in dilute magnetic oxides, proposing a model combining magnetic polaron percolation and RKKY interactions to explain experimental observations.

Contribution

It introduces a theoretical framework that explains high-temperature ferromagnetism in dilute magnetic oxides through combined magnetic polaron and RKKY mechanisms.

Findings

High critical temperatures (~700 K) can be explained by the combined mechanisms.

Percolation of magnetic polarons occurs at lower temperatures.

RKKY ferromagnetism dominates at higher temperatures.

Abstract

We analyze the origin of ferromagnetism as a result of carrier mediation in diluted magnetic oxide semiconductors in the light of the experimental evidence reported in the literature. We propose that a combination of percolation of magnetic polarons at lower temperature and Ruderman-Kittel-Kasuya-Yosida ferromagnetism at higher temperature may be the reason for the very high critical temperatures measured (up to ~700 K).