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dc.contributor.authorMenéndez, E.-
dc.contributor.authorLópez-Barbera, José Francisco-
dc.contributor.authorNogués, Josep-
dc.contributor.authorVantomme, André-
dc.contributor.authorTemst, Kristiaan-
dc.identifierdoi: 10.1103/PhysRevB.89.144407-
dc.identifierissn: 1098-0121-
dc.identifiere-issn: 1550-235X-
dc.identifier.citationPhysical Review B 89(14): 144407 (2014)-
dc.descriptionUnder the terms of the Creative Commons Attribution License 3.0 (CC-BY).-- et al.-
dc.description.abstractThe interdependence between training and magnetization reversal in granular Co-CoO exchange bias (EB) systems prepared by O ion implantation in Co thin films is demonstrated by polarized neutron reflectometry. While high-fluence O-implanted thin films show reduced relative training values and no asymmetry in magnetization reversal (all reversals take place by domain wall nucleation and motion), low-fluence O ion implantation results in an increased relative training and a magnetization reversal asymmetry between the first descending and the first ascending branches. Whereas the untrained decreasing field reversal occurs mainly by domain wall nucleation and motion, traces of a domain rotation contribution are evidenced in the increasing field reversal. This is explained by the evolution of the CoO structure and the contribution of the out-of-plane magnetization with ion implantation. The amount of incorporated O, which determines the threshold between both behaviors, is around 20 at.%. This reveals that the interdependence between training and magnetization reversal is insensitive to the morphology of the constituents (i.e., granular or layered), indicating that this is an intrinsic EB effect, which can be conveniently tailored by the interplay between the intrinsic properties of the investigated materials and ion implantation.-
dc.description.sponsorshipThis work was financed by the Research Foundation - Flanders (FWO), the KU Leuven Concerted Action (GOA/09/006 and GOA/14/007) programs, the 2009-SGR-1292 project of the Generalitat de Catalunya, the MAT2010-20616-C02 project of the Spanish Ministerio de Economía y Competitividad, and the European Commission under the 7th Framework Programme through the “Research Infrastructure” action of the “Capacities” Programme, NMI3-II Grant No. 283883. We thank HZB (Proposal No. PHY-04-2130) and ESRF (Proposal No. HC-1012, BM20 beamline) for the allocation of neutron and synchrotron radiation beamtime, respectively, and C. Bähtz for the assistance during the synchrotron measurements. E.M. and L.M.C.P. also thank the FWO for financial support. T.D. thanks the CNPq agency (Project No. 245897/2012-7) for financial support.-
dc.publisherAmerican Physical Society-
dc.relation.isversionofPublisher's version-
dc.titleInterdependence between training and magnetization reversal in granular Co-CoO exchange bias systems-
dc.description.versionPeer Reviewed-
dc.contributor.funderMinisterio de Economía y Competitividad (España)-
dc.contributor.funderConselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil)-
dc.contributor.funderEuropean Commission-
dc.contributor.funderEuropean Synchrotron Radiation Facility-
dc.contributor.funderHelmholtz-Zentrum Berlin for Materials and Energy-
dc.contributor.funderUniversity of Leuven-
dc.contributor.funderResearch Foundation - Flanders-
dc.contributor.funderGeneralitat de Catalunya-
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