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Interdependence between training and magnetization reversal in granular Co-CoO exchange bias systems

AuthorsMenéndez, E.; López-Barbera, José Francisco; Nogués, Josep ; Vantomme, André; Temst, Kristiaan
Issue Date2014
PublisherAmerican Physical Society
CitationPhysical Review B 89(14): 144407 (2014)
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.
DescriptionUnder the terms of the Creative Commons Attribution License 3.0 (CC-BY).-- et al.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.89.144407
Identifiersdoi: 10.1103/PhysRevB.89.144407
issn: 1098-0121
e-issn: 1550-235X
Appears in Collections:(CIN2) Artículos
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