Home > Articles > Published articles > Interdependence between training and magnetization reversal in granular Co-CoO exchange bias systems |
Date: | 2014 |
Abstract: | The 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. |
Grants: | European Commission 283883 Ministerio de Economía y Competitividad MAT2010-20616-C02 Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-1292 |
Rights: | Tots els drets reservats. |
Language: | Anglès |
Document: | Article ; recerca ; Versió sotmesa a revisió |
Published in: | Physical review B : Condensed matter and materials physics, Vol. 89, issue 14 (Sep. 2014) , art. 144407, ISSN 1550-235X |
Preprint 22 p, 1.1 MB |