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Formation of oriented nickel aggregates in rutile single crystals by Ni implantation

2013-08Journal article Open access
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dc.contributor.authorCruz, M. M.
dc.contributor.authorSilva, R. C. da
dc.contributor.authorPinto, J. V.
dc.contributor.authorBorges, R. P.
dc.contributor.authorFranco, N.
dc.contributor.authorCasaca, A.
dc.contributor.authorAlves, E.
dc.contributor.authorGodinho, M.
dc.date.accessioned2013-11-02T19:06:05Z
dc.date.available2013-11-02T19:06:05Z
dc.date.issued2013-08
dc.description.abstractThe magnetic and electrical properties of Ni implanted single crystalline TiO2 rutile were studied for nominal implanted fluences between 0.5 x 10(17) cm(-2) and 2.0 x 10(17) cm(-2) with 150 keV energy, corresponding to maximum atomic concentrations between 9 at% and 27 at% at 65 nm depth, in order to study the formation of metallic oriented aggregates. The results indicate that the as implanted crystals exhibit superparamagnetic behavior for the two higher fluences, which is attributed to the formation of nanosized nickel clusters with an average size related with the implanted concentration, while only paramagnetic behavior is observed for the lowest fluence. Annealing at 1073 K induces the aggregation of the implanted nickel and enhances the magnetization in all samples. The associated anisotropic behavior indicates preferred orientations of the nickel aggregates in the rutile lattice consistent with Rutherford backscattering spectrometry-channelling results. Electrical conductivity displays anisotropic behavior but no magnetoresistive effects were detected. (C) 2013 Elsevier B.V. All rights reserved.por
dc.identifier.citationCRUZ, M. M.; SILVA, R. C. da; PINTO, J. V.; BORGES, R. P.; FRANCO, N.; CASACA, A.; ALVES, E.; GODINHO, M. - Formation of oriented nickel aggregates in rutile single crystals by Ni implantation. Journal of Magnetism and Magnetic Materials. ISSN 304-8853. Vol. 340 (2013), p. 102-108.por
dc.identifier.issn0304-8853
dc.identifier.other10.1016/j.jmmm.2013.03.032
dc.identifier.urihttp://hdl.handle.net/10400.21/2848
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevier Science BVpor
dc.subjectNickel nanoparticlepor
dc.subjectTitanium dioxidepor
dc.subjectMagnetic aggregatepor
dc.subjectRoom-temperature ferromagnetismpor
dc.subjectThin-filmspor
dc.subjectDoped TIO2por
dc.subjectAnisotropic ferromagnetismpor
dc.subjectMagnetic-propertiespor
dc.subjectIon-implantationpor
dc.subjectCOpor
dc.subjectCobaltpor
dc.subjectNanoparticlespor
dc.subjectFEpor
dc.titleFormation of oriented nickel aggregates in rutile single crystals by Ni implantationpor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceAmsterdampor
oaire.citation.endPage108por
oaire.citation.startPage102por
oaire.citation.titleJournal of Magnetism and Magnetic Materialspor
oaire.citation.volume340por
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor

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