title: Graphene mediated domain formation in exchange coupled graphene/Co3O4(111)/Co(0001) trilayers.
abstract: Graphene grown directly on Co3O4(111)/Co(0001) by molecular beam epitaxy exhibits extrinsic p-type doping, as demonstrated by photoemission and conductivity measurements. Trilayer heterostructures of graphene/Co3O4(111)/Co(0001) reveal an unconventional magneto-optical Kerr hysteresis with vanishing remanence for temperatures up to 400 K. Magnetic force microscopy measurements demonstrate that the vanishing remanence is due to a complex domain state, indicating substrate-induced graphene spin polarization. The domain formation of the Co magnetization is in strong contrast to the magnetic behavior of Co in Co/Co3O4 bilayers. This suggests that the Co3O4 interlayer mediates the variable Co magnetization and induced graphene spin polarization, with possible retroaction of graphene on the Co film.
authors.affiliation: Department of Physics and Astronomy, Nebraska Center for Materials and Nanoscience, Theodore Jorgensen Hall, 855 North 16th Street, University of Nebraska, PO Box 880299, Lincoln, NE 68588-0299, USA.
authors.forename: Yi
authors.initials: Y
authors.lastname: Wang
authors.forename: Lingmei
authors.initials: L
authors.lastname: Kong
authors.forename: Frank L
authors.initials: FL
authors.lastname: Pasquale
authors.forename: Yuan
authors.initials: Y
authors.lastname: Cao
authors.forename: Bin
authors.initials: B
authors.lastname: Dong
authors.forename: Iori
authors.initials: I
authors.lastname: Tanabe
authors.forename: Christian
authors.initials: C
authors.lastname: Binek
authors.forename: Peter A
authors.initials: PA
authors.lastname: Dowben
authors.forename: Jeffry A
authors.initials: JA
authors.lastname: Kelber