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Electron magnetic resonance and magnetooptical studies of nanoparticle-containing borate glasses

hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorKLIAVA, Janis
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.authorPETRAKOVSKAJA, Eleonora
hal.structure.identifierConditions Extrêmes et Matériaux : Haute Température et Irradiation [CEMHTI]
dc.contributor.authorHENNET, Louis
hal.structure.identifierSynchrotron SOLEIL [SSOLEIL]
dc.contributor.authorTHIAUDIÈRE, Dominique
hal.structure.identifierCentre de Recherche sur la Matière Divisée [CRMD]
dc.contributor.authorSABOUNGI, Marie-Louise
dc.date.created2010-03-26
dc.date.issued2011-03-01
dc.identifier.issn0304-8853
dc.description.abstractEnWe report electron magnetic resonance (EMR) and magnetooptical studies of borate glasses of molar composition 22.5K2O-22.5Al2O3-55B2O3 co-doped with low concentrations of Fe2O3 and MnO. In as-prepared samples the paramagnetic ions, as a rule, are in diluted state. However, in the case where the ratio of the iron and manganese oxides in the charge is 3/2, magnetic nanoparticles with characteristics close to those of manganese ferrite are formed already at the first stage of the glass preparation, as evidenced by both magnetic circular dichroism (MCD) and EMR. After thermal treatment all glasses show characteristic MCD and EMR spectra, attesting to the presence of magnetic nanoparticles, predominantly including iron ions. Preliminary EXAFS measurements at the FeK-absorption edge show an emergence of nanoparticles with a structure close to MnFe2O4 after annealing the glasses at 560 1C. By computer simulating the EMR spectra at variable temperatures, a superparamagnetic nature of relatively broad size and shape distribution with the average diameter of ca. 3-4 nm. The characteristic temperature-dependent shift of the apparent resonance field is explained by a strong temperature dependence of the magnetic anisotropy in the nanoparticles. The formation of magnetic nanoparticles confers to the potassium-alumina-borate glassesmagnetic and magneto-optical properties typical of magnetically ordered substances. At the same time, they remain transparent in a part of the visible and near infrared spectral range and display a high Faraday rotation value.
dc.language.isoen
dc.publisherElsevier
dc.subjectBorate glasses
dc.subjectMagnetic nanoparticles
dc.subjectElectron magnetic resonance
dc.subjectMagnetooptics
dc.title.enElectron magnetic resonance and magnetooptical studies of nanoparticle-containing borate glasses
dc.typeArticle de revue
dc.identifier.doi10.1016/j.jmmm.2010.09.045
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]/Autre [cond-mat.other]
bordeaux.journalJournal of Magnetism and Magnetic Materials
bordeaux.page451-460
bordeaux.volume323
bordeaux.issue5
bordeaux.peerReviewedoui
hal.identifierhal-00608689
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00608689v1
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