title: Electron spin resonance of proton-irradiated graphite.
abstract: In the case of colossal magnetoresistance in the perovskite manganites, "double exchange" mediated by the itinerant spins is believed to play a key role in the ferromagnetism. In contrast, the conventional "Heisenberg" interaction, i.e., direct (unmediated) interaction between the localized spins produced by the proton irradiation, is identified as the origin of proton irradiation-induced ferromagnetism in graphite.
authors.affiliation: Department of Physics and Institute for Nano Science, Korea University, Seoul 136-713, Korea.
authors.forename: Kyu Won
authors.initials: KW
authors.lastname: Lee
authors.forename: Cheol Eui
authors.initials: CE
authors.lastname: Lee