Magnetic frustration of graphite oxide

Abstract

Delocalized € electrons in aromatic ring structures generally induce diamagnetism. In graphite oxide, however, € electrons develop ferromagnetism due to the unique structure of the material. The € electrons are only mobile in the graphitic regions of graphite oxide, which are dispersed and surrounded by sp 3 -hybridized carbon atoms. The spin-glass behavior of graphite oxide is corroborated by the frequency dependence of its AC susceptibility. The magnetic susceptibility data exhibit a negative Curie temperature, field irreversibility, and slow relaxation. The overall results indicate that magnetic moments in graphite oxide slowly interact and develop magnetic frustration.