Ferromagnetism in Oriented Graphite Samples
P. Esquinazi, A. Setzer, R. Hoehne, C. Semmelhack, Y. Kopelevich, D., Spemann, T. Butz, B. Kohlstrunk, M. Loesche
TL;DR
This study investigates ferromagnetic signals in highly oriented graphite samples, finding evidence suggesting the ferromagnetism is intrinsic to graphite rather than impurity-driven.
Contribution
It provides experimental evidence that ferromagnetism in graphite may originate intrinsically, challenging the impurity-based explanations.
Findings
No correlation between ferromagnetic signal and impurity concentration
Ferromagnetism observed is likely intrinsic to graphite
Results suggest intrinsic magnetic properties in graphite samples
Abstract
We have studied the magnetization of various, well characterized samples of highly oriented pyrolitic graphite (HOPG), Kish graphite and natural graphite to investigate the recently reported ferromagnetic-like signal and its possible relation to ferromagnetic impurities. The magnetization results obtained for HOPG samples for applied fields parallel to the graphene layers - to minimize the diamagnetic background - show no correlation with the magnetic impurity concentration. Our overall results suggest an intrinsic origin for the ferromagnetism found in graphite. We discuss possible origins of the ferromagnetic signal.
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