Sub-3nm cobalt nanoparticles embedded in titania glass via ion implantation studied by polarised neutron reflectometry

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dc.contributor.authorBake, Aen_AU
dc.contributor.authorPastuovic, Zen_AU
dc.contributor.authorCortie, DLen_AU
dc.contributor.authorMitchell, DRGen_AU
dc.contributor.authorWang, XLen_AU
dc.date.accessioned2023-05-04T06:41:40Zen_AU
dc.date.available2023-05-04T06:41:40Zen_AU
dc.date.issued2020-11-11en_AU
dc.date.statistics2023-04-24en_AU
dc.description.abstractSynthesis of stable metallic cobalt particles at the nanoscale is challenging using chemical methods due to their unstable nature and their tendency to oxidise. Nevertheless, ultra-small metallic cobalt nanoparticles offer unusual electronic and magnetic properties including large spin moments and magnetic anisotropy[1] [2]. Here we report the use of ion beam implantation to synthesis stable metallic cobalt nanoparticles embedded within TiO2-x thin films. Scanning transmission electron microscopy (STEM) images revealed that the Co nanoclusters were around 1-3 nm in size. The blocking temperature of Co nanoparticles is estimated to be TB = 6.5 K from the field-cooled and zero-field-cooled magnetization curves. Polarised neutron reflectometry (PNR) measurements reveal superparamagnetic behaviour with a strong temperature dependency due to the small size of the nanoclusters. The nuclear scattering length density, together with near-edge X-ray absorption spectroscopy (NEXAFS) show that the magnetic cobalt clusters are metallic and unoxidized below the TiO2-x surface, whereas near the surface the clusters are prone to form cobalt oxides in a magnetic dead layer that extends over a few nanometers. Our results show that ion beam synthesis can produce ultra-small particles that are not possible with other methods, and these particles survive for long periods without much oxidation.en_AU
dc.identifier.citationBake, A., Pastuovic, Z., Cortie, D., Mitchell, D., & Wang, X. (2020). Sub-3nm cobalt nanoparticles embedded in titania glass via ion implantation studied by polarised neutron reflectometry. Paper presented to the ANBUG-AINSE Neutron Scattering Symposium, AANSS 2020, Virtual Meeting, 11th - 13th November 2020. (pp. 43). Retrieved from: https://events01.synchrotron.org.au/event/125/attachments/725/1149/AANSS_Abstract_Booklet_Complete_-_1_Page_Reduced.pdfen_AU
dc.identifier.conferenceenddate13 November 2020en_AU
dc.identifier.conferencenameANBUG-AINSE Neutron Scattering Symposium, AANSS 2020en_AU
dc.identifier.conferenceplaceVirtual Meetingen_AU
dc.identifier.conferencestartdate11 November 2020en_AU
dc.identifier.pagination43en_AU
dc.identifier.urihttps://events01.synchrotron.org.au/event/125/attachments/725/1149/AANSS_Abstract_Booklet_Complete_-_1_Page_Reduced.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14980en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Nuclear Science and Engineering (AINSE)en_AU
dc.subjectSynthesisen_AU
dc.subjectCobalten_AU
dc.subjectNanoparticlesen_AU
dc.subjectMicroscopyen_AU
dc.subjectMagnetizationen_AU
dc.subjectSpectroscopyen_AU
dc.subjectScatteringen_AU
dc.subjectAnisotropyen_AU
dc.subjectIonsen_AU
dc.subjectOxidationen_AU
dc.titleSub-3nm cobalt nanoparticles embedded in titania glass via ion implantation studied by polarised neutron reflectometryen_AU
dc.typeConference Abstracten_AU
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