title: The Intrinsic Ferromagnetism in a MnO2 Monolayer.
abstract: The Mn atom, because of its special electronic configuration of 3d(5)4s(2), has been widely used as a dopant in various two-dimensional (2D) monolayers such as graphene, BN, silicene and transition metal dichalcogenides (TMDs). The distributions of doped Mn atoms in these systems are highly sensitive to the synthesis process and conditions, thus suffering from problems of low solubility and surface clustering. Here we show for the first time that the MnO2 monolayer, synthetized 10 years ago, where Mn ions are individually held at specific sites, exhibits intrinsic ferromagnetism with a Curie temperature of 140 K, comparable to the highest TC value achieved experimentally for Mn-doped GaAs. The well-defined atomic configuration and the intrinsic ferromagnetism of the MnO2 monolayer suggest that it is superior to other magnetic monolayer materials.
authors.affiliation: Department of Materials Science and Engineering, Peking University , Beijing 100871, China.
authors.forename: M
authors.initials: M
authors.lastname: Kan
authors.affiliation: Department of Materials Science and Engineering, Peking University , Beijing 100871, China.
authors.forename: J
authors.initials: J
authors.lastname: Zhou
authors.affiliation: Department of Materials Science and Engineering, Peking University , Beijing 100871, China.|Center for Applied Physics and Technology, Peking University , Beijing 100871, China.|Department of Physics, Virginia Commonwealth University , Richmond, Virginia 23284, United States.
authors.forename: Q
authors.initials: Q
authors.lastname: Sun
authors.affiliation: Institute for Material Research, Tohoku University , Sendai, 980-8577, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kawazoe
authors.affiliation: Department of Physics, Virginia Commonwealth University , Richmond, Virginia 23284, United States.
authors.forename: P
authors.initials: P
authors.lastname: Jena
keywords: Curie temperature; coupling; magnetism; nanosheet; spintronics