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Magnetic nanoparticles formed in glasses co-doped with iron and larger radius elements

hal.structure.identifierL.V. Kirensdy Institute of Physics
dc.contributor.authorEDELMAN, Irina
hal.structure.identifierL.V. Kirensdy Institute of Physics
dc.contributor.authorIVANOVA, Oxana
hal.structure.identifierL.V. Kirensdy Institute of Physics
dc.contributor.authorIVANTSOV, Ruslan
hal.structure.identifierL.V. Kirensdy Institute of Physics
dc.contributor.authorVELIKANOV, D.
hal.structure.identifierL.V. Kirensdy Institute of Physics
dc.contributor.authorZABLUDA, V.
hal.structure.identifierNational Research Center "Kurchatov Institute" [NRC KI]
dc.contributor.authorZUBAVICHUS, Y.
hal.structure.identifierNational Research Center "Kurchatov Institute" [NRC KI]
dc.contributor.authorVELIGZHANIN, A.
hal.structure.identifierBoreskov Institute of Catalysis
dc.contributor.authorZAIKOVSKIY, V.
hal.structure.identifierS.I. Vavilov State Optical Institute
dc.contributor.authorSTEPANOV, S.
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorARTEMENKO, Alla
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorCURÉLY, Jacques
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorKLIAVA, Janis
dc.date.created2012-04-02
dc.date.issued2012
dc.identifier.issn0021-8979
dc.description.abstractEnA new type of nanoparticle-containing glasses based on borate glasses co-doped with low contents of iron and larger radius elements, Dy, Tb, Gd, Ho, Er, Y, and Bi, is studied. Heat treatment of these glasses results in formation of magnetic nanoparticles, radically changing their physical properties. Transmission electron microscopy and synchrotron radiation-based techniques: x-ray diffraction, extended x-ray absorption fine structure, x-ray absorption near-edge structure, and small-angle x-ray scattering, show a broad distribution of nanoparticle sizes with characteristics depending on the treatment regime; a crystalline structure of these nanoparticles is detected in heat treated samples. Magnetic circular dichroism (MCD) studies of samples subjected to heat treatment as well as of maghemite, magnetite, and iron garnet allow to unambiguously assign the nanoparticle structure to maghemite, independently of co-dopant nature and of heat treatment regime used. Different features observed in the MCD spectra are related to different electron transitions in Fe3+ ions gathered in the nanoparticles. The static magnetization in heat treated samples has non-linear dependence on the magnetizing field with hysteresis. Zero-field cooled magnetization curves show that at higher temperatures the nanoparticles occur in superparamagnetic state with blocking temperatures above 100 K. Below ca. 20 K, a considerable contribution to both zero field-cooled and field-cooled magnetizations occurs from diluted paramagnetic ions. Variable-temperature electron magnetic resonance (EMR) studies unambiguously show that in as-prepared glasses paramagnetic ions are in diluted state and confirm the formation of magnetic nanoparticles already at earlier stages of heat treatment. Computer simulations of the EMR spectra corroborate the broad distribution of nanoparticle sizes found by "direct" techniques as well as superparamagnetic nanoparticle behaviour demonstrated in the magnetization studies.
dc.language.isoen
dc.publisherAmerican Institute of Physics
dc.title.enMagnetic nanoparticles formed in glasses co-doped with iron and larger radius elements
dc.typeArticle de revue
dc.identifier.doi10.1063/1.4759244
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
dc.description.sponsorshipEuropeElectron paramagnetic resonance as a probe for extended interfaces in nanomaterials
bordeaux.journalJournal of Applied Physics
bordeaux.page084331
bordeaux.volume112
bordeaux.issue8
bordeaux.peerReviewedoui
hal.identifierhal-00772532
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00772532v1
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