title: Magnetic phases of cobalt atomic clusters on tungsten.
abstract: First-principle calculations are employed to show that the magnetic structure of small atomic clusters of Co, formed on a crystalline W(110) surface and containing 3-12 atoms, strongly deviates from the usual stable ferromagnetism of Co in other systems. The clusters are ferri-, ferro- or non-magnetic, depending on cluster size and geometry. We determine the atomic Co moments and their relative alignment, and show that antiferromagnetic spin alignment in the Co clusters is caused by hybridization with the tungsten substrate and band filling. This is in contrast with the typical strong ferromagnetism of bulk Co alloys, and ferromagnetic coupling in Fe/W(110) clusters.
authors.affiliation: Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE 68588, USA. pavel.lukashev@unl.edu
authors.forename: Pavel V
authors.initials: PV
authors.lastname: Lukashev
authors.forename: Ji-Hyun
authors.initials: JH
authors.lastname: Kim
authors.forename: Seolun
authors.initials: S
authors.lastname: Yang
authors.forename: Jae-Sung
authors.initials: JS
authors.lastname: Kim
authors.forename: Xumin
authors.initials: X
authors.lastname: Chen
authors.forename: Geoffrey
authors.initials: G
authors.lastname: Rojas
authors.forename: Jan
authors.initials: J
authors.lastname: Honolka
authors.forename: Ralph
authors.initials: R
authors.lastname: Skomski
authors.forename: Axel
authors.initials: A
authors.lastname: Enders
authors.forename: Renat F
authors.initials: RF
authors.lastname: Sabirianov
mesh_terms: D000497:Alloys; D003035:Cobalt / Q000737:chemistry*; D018360:Crystallography, X-Ray; D059346:Magnets / Q000737:chemistry*; D008962:Models, Theoretical; D013113:Spin Labels; D014414:Tungsten / Q000737:chemistry*
chemical_list: D000497:Alloys; D013113:Spin Labels; D003035:Cobalt; D014414:Tungsten