title: Dual antiferromagnetic coupling at La0.67Sr0.33MnO3/SrRuO3 interfaces.
abstract: We have studied the magnetic hysteresis cycle of La0.67Sr0.33MnO3/SrRuO3 antiferromagnetically coupled bilayers, by magnetometry and polarized neutron reflectometry. A positive exchange bias as well as an unusual asymmetry are observed on the magnetic reversal process of the La0.67Sr0.33MnO3 layer. Through an extended Stoner-Wohlfarth model comprising the magnetic anisotropy of both layers, we give experimental evidence that this asymmetry originates from two different but well-defined antiferromagnetic coupling strengths at the interface between the two magnetic oxides. The possible origin of this dual coupling is discussed in view of our experimental results.
authors.affiliation: DSM/IRAMIS/SPEC-URA 2464, CEA Saclay, F-91191 Gif sur Yvette Cedex, France. aurelie.solignac@cea.fr
authors.forename: A
authors.initials: A
authors.lastname: Solignac
authors.forename: R
authors.initials: R
authors.lastname: Guerrero
authors.forename: P
authors.initials: P
authors.lastname: Gogol
authors.forename: T
authors.initials: T
authors.lastname: Maroutian
authors.forename: F
authors.initials: F
authors.lastname: Ott
authors.forename: L
authors.initials: L
authors.lastname: Largeau
authors.forename: Ph
authors.initials: P
authors.lastname: Lecoeur
authors.forename: M
authors.initials: M
authors.lastname: Pannetier-Lecoeur