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

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

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Título Interdependence between training and magnetization reversal in granular Co-CoO exchange bias systems
Autor Menéndez Dalmau, Enric
Dias, Thiago
Geshev, Julian Penkov
López-Barberá Martín, José Francisco
Nogués Sanmiquel, Josep
Steitz, Roland
Kirby, Brian J.
Borchers, Julie A.
Pereira, Lino Miguel da Costa
Vantomme, A.
Temst, Kristiaan
Abstract The interdependence between training and magnetization reversal in granular Co-CoO exchange bias (EB) systems prepared byOion implantation inCo 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.
Contido em Physical review. B, Condensed matter and materials physics. Woodbury. Vol. 89, no. 14 (Apr. 2014), 144407, 9 p.
Assunto Compostos de cobalto
Filmes finos magneticos
Implantacao ionica
Materiais granulares
Nucleacao
Paredes de domínios magnéticos
Reversão de magnetização
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/104580
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