Searching for a magnetic proximity effect in magnetite-carbon structures

TL;DR

This study investigates whether magnetite can induce ferromagnetism in graphite and carbon structures through proximity effects, using magnetization and magnetoresistance measurements, and finds no evidence of such induction.

Contribution

It provides experimental evidence that magnetite does not induce bulk ferromagnetism in graphite-carbon composites via proximity effects.

Findings

No bulk ferromagnetism induced in graphite by magnetite

Magnetization measurements show no significant magnetic change

Magnetoresistance measurements do not indicate proximity effects

Abstract

In order to study a possible magnetic proximity effect in magnetite-carbon structures, we have performed magnetization measurements of graphite-magnetite composites with different mass ratios as well as the measurement of the magnetoresistance of one of them and of the magnetization of a magnetite-carbon bilayer. The overall results do not indicate the induction of bulk ferromagnetism in graphite and disordered carbon structures through their contact with magnetite.