title: Room-temperature magnetic ordering in functionalized graphene.
abstract: Despite theoretical predictions, the question of room-temperature magnetic order in graphene must be conclusively resolved before graphene can fully achieve its potential as a spintronic medium. Through scanning tunneling microscopy (STM) and point I-V measurements, the current study reveals that unlike pristine samples, graphene nanostructures, when functionalized with aryl radicals, can sustain magnetic order. STM images show 1-D and 2-D periodic super-lattices originating from the functionalization of a single sub-lattice of the bipartite graphene structure. Field-dependent super-lattices in 3-nm wide "zigzag" nanoribbons indicate local moments with parallel and anti-parallel ordering along and across the edges, respectively. Anti-parallel ordering is observed in 2-D segments with sizes of over 20 nm. The field dependence of STM images and point I-V curves indicates a spin polarized local density of states (LDOS), an out-of-plane anisotropy field of less than 10 Oe, and an exchange coupling field of 100 Oe at room temperature.
authors.affiliation: Department of Electrical and Computer Engineering, Florida International University, Miami, Florida 33174, USA.
authors.forename: Jeongmin
authors.initials: J
authors.lastname: Hong
authors.forename: Elena
authors.initials: E
authors.lastname: Bekyarova
authors.forename: Ping
authors.initials: P
authors.lastname: Liang
authors.forename: Walt A
authors.initials: WA
authors.lastname: de Heer
authors.forename: Robert C
authors.initials: RC
authors.lastname: Haddon
authors.forename: Sakhrat
authors.initials: S
authors.lastname: Khizroev