Ferromagnetism in Graphene Nanoribbons: Split versus Oxidative Unzipped Ribbons

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dc.citation.firstpage1210
dc.citation.issueNumber3
dc.citation.journalTitleNano Letters
dc.citation.lastpage1217
dc.citation.volumeNumber12
dc.contributor.authorRao, S.S.
dc.contributor.authorJammalamadaka, S. Narayana
dc.contributor.authorStesmans, A.
dc.contributor.authorMoshchalkov, V.V.
dc.contributor.authorvan Tol, J.
dc.contributor.authorKosynkin, D.V.
dc.contributor.authorHigginbotham, A.
dc.contributor.authorTour, J.M.
dc.contributor.orgSmalley Institute for Nanoscale Science and Technology
dc.date.accessioned2016-06-08T16:16:52Z
dc.date.available2016-06-08T16:16:52Z
dc.date.issued2012
dc.description.abstractTwo types of graphene nanoribbons: (a) potassium-split graphene nanoribbons (GNRs), and (b) oxidative unzipped and chemically converted graphene nanoribbons (CCGNRs) were investigated for their magnetic properties using the combination of static magnetization and electron spin resonance measurements. The two types of ribbons possess remarkably different magnetic properties. While a low-temperature ferromagnet-like feature is observed in both types of ribbons, such room-temperature feature persists only in potassium-split ribbons. The GNRs show negative exchange bias, but the CCGNRs exhibit a ﾓpositive exchange biasﾔ. Electron spin resonance measurements suggest that the carbon-related defects may be responsible for the observed magnetic behavior in both types of ribbons. Furthermore, information on the proton hyperfine coupling strength has been obtained from hyperfine sublevel correlation experiments performed on the GNRs. Electron spin resonance finds no evidence for the presence of potassium (cluster) related signals, pointing to the intrinsic magnetic nature of the ribbons. Our combined experimental results may indicate the coexistence of ferromagnetic clusters with antiferromagnetic regions leading to disordered magnetic phase. We discuss the possible origin of the observed contrast in the magnetic behaviors of the two types of ribbons studied.
dc.identifier.citationRao, S.S., Jammalamadaka, S. Narayana, Stesmans, A., et al.. "Ferromagnetism in Graphene Nanoribbons: Split versus Oxidative Unzipped Ribbons." <i>Nano Letters,</i> 12, no. 3 (2012) American Chemical Society: 1210-1217. http://dx.doi.org/10.1021/nl203512c.
dc.identifier.doihttp://dx.doi.org/10.1021/nl203512c
dc.identifier.urihttps://hdl.handle.net/1911/90463
dc.language.isoeng
dc.publisherAmerican Chemical Society
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the American Chemical Society.
dc.subject.keywordmagnetism
dc.subject.keywordgraphene nanoribbons
dc.subject.keywordexchange bias
dc.subject.keywordESR
dc.subject.keywordHYSCORE
dc.titleFerromagnetism in Graphene Nanoribbons: Split versus Oxidative Unzipped Ribbons
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpost-print
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