title: Limits on intrinsic magnetism in graphene.
abstract: We have studied magnetization of graphene nanocrystals obtained by sonic exfoliation of graphite. No ferromagnetism is detected at any temperature down to 2 K. Neither do we find strong paramagnetism expected due to the massive amount of edge defects. Rather, graphene is strongly diamagnetic, similar to graphite. Our nanocrystals exhibit only a weak paramagnetic contribution noticeable below 50 K. The measurements yield a single species of defects responsible for the paramagnetism, with approximately one magnetic moment per typical graphene crystallite.
authors.affiliation: Manchester Centre for Mesoscience & Nanotechnology, University of Manchester, Manchester M13 9PL, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Sepioni
authors.forename: R R
authors.initials: RR
authors.lastname: Nair
authors.forename: S
authors.initials: S
authors.lastname: Rablen
authors.forename: J
authors.initials: J
authors.lastname: Narayanan
authors.forename: F
authors.initials: F
authors.lastname: Tuna
authors.forename: R
authors.initials: R
authors.lastname: Winpenny
authors.forename: A K
authors.initials: AK
authors.lastname: Geim
authors.forename: I V
authors.initials: IV
authors.lastname: Grigorieva