Room-temperature ferromagnetism in oxidized-graphenic nanoplatelets induced by topographic defects

•Electron-micrographs, bulk and MFM magnetization of pyrolytic oxidized-graphenic nanoplatelets are presented.•Ferromagnetism order at room-temperature induced by topographic defects was experimentally observed.•Increased defect density, results in enhanced magnetization. This work reports on room-t...

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Published inJournal of magnetism and magnetic materials Vol. 524; p. 167664
Main Authors Prías-Barragán, J.J., Gross, K., Ariza-Calderón, H., Prieto, P., Di Giorgio, C., Bobba, F., Cucolo, A.M.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.04.2021
Elsevier BV
Subjects
Bamboo
Basal plane
Bulk density
Clusters
Defects
Ferromagnetism
Graphene
Magnetic fields
Magnetic signals
Magnetism
Magnetization
Nanoplatelets
Oxidized-graphene
Room temperature
Topography
Oxidized-graphene
Nanoplatelets
Magnetism
Ferromagnetism
Defects
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Summary:•Electron-micrographs, bulk and MFM magnetization of pyrolytic oxidized-graphenic nanoplatelets are presented.•Ferromagnetism order at room-temperature induced by topographic defects was experimentally observed.•Increased defect density, results in enhanced magnetization. This work reports on room-temperature ferromagnetism of pyrolytic oxidized-graphene nanoplatelets obtained from bamboo pyroligneous acid by varying the density of extended defects. Topographic defects, created during the fabrication process, arise from a natural formation of clusters; such clusters drastically distort the graphitic basal plane, giving rise to abrupt surface curvatures. Topographic defects were found to be sources of the magnetic signal, as evidenced by bulk magnetization and magnetic force microscopy measurements. Increased defect density, tuned by carbonization temperature, results in enhanced magnetization.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2020.167664