title: Antiferromagnetic coupling of TbPc2 molecules to ultrathin Ni and Co films.
abstract: The magnetic and electronic properties of single-molecule magnets are studied by X-ray absorption spectroscopy and X-ray magnetic circular dichroism. We study the magnetic coupling of ultrathin Co and Ni films that are epitaxially grown onto a Cu(100) substrate, to an in situ deposited submonolayer of TbPc2 molecules. Because of the element specificity of the X-ray absorption spectroscopy we are able to individually determine the field dependence of the magnetization of the Tb ions and the Ni or Co film. On both substrates the TbPc2 molecules couple antiferromagnetically to the ferromagnetic films, which is possibly due to a superexchange interaction via the phthalocyanine ligand that contacts the magnetic surface.
authors.affiliation: Faculty of Physics and CENIDE, University Duisburg-Essen, Lotharstraße 1, 47048 Duisburg, Germany.
authors.forename: David
authors.initials: D
authors.lastname: Klar
authors.forename: Svetlana
authors.initials: S
authors.lastname: Klyatskaya
authors.forename: Andrea
authors.initials: A
authors.lastname: Candini
authors.forename: Bernhard
authors.initials: B
authors.lastname: Krumme
authors.forename: Kurt
authors.initials: K
authors.lastname: Kummer
authors.forename: Philippe
authors.initials: P
authors.lastname: Ohresser
authors.forename: Valdis
authors.initials: V
authors.lastname: Corradini
authors.forename: Valentina
authors.initials: V
authors.lastname: de Renzi
authors.forename: Roberto
authors.initials: R
authors.lastname: Biagi
authors.forename: Loic
authors.initials: L
authors.lastname: Joly
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Kappler
authors.forename: Umberto
authors.initials: U
authors.lastname: Del Pennino
authors.forename: Marco
authors.initials: M
authors.lastname: Affronte
authors.forename: Heiko
authors.initials: H
authors.lastname: Wende
authors.forename: Mario
authors.initials: M
authors.lastname: Ruben
keywords: X-ray absorption spectroscopy; magnetic anisotropy; magnetic coupling; single molecule magnets