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Magnetic structure of mixed iron-gallium borate crystals

hal.structure.identifierPhysics and Technology Institute
dc.contributor.authorSELEZNYOVA, Kira
hal.structure.identifierPhysics and Technology Institute
dc.contributor.authorSTRUGATSKY, Mark
hal.structure.identifierPhysics and Technology Institute
dc.contributor.authorYAGUPOV, Sergey
hal.structure.identifierPhysics and Technology Institute
dc.contributor.authorMOGILENEC, Yuliya
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorROSA, Patrick
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGONIDEC, Mathieu
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorKLIAVA, Janis
dc.date.accessioned2024-03-12T03:12:11Z
dc.date.available2024-03-12T03:12:11Z
dc.date.issued2024
dc.identifier.issn0925-8388
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/188702
dc.description.abstractEnIron-gallium borate, FexGa1−xBO3, single crystals have been synthesized by the solution in the melt technique. The exact x-values in the crystals have been determined by X-ray fluorescence analysis and checked by Energy Dispersive X-Ray Spectroscopy. Scanning Electron Microscopy has been used to map distributions of iron and gallium ions in the crystals. The electron magnetic resonance (EMR) spectra as well as field and temperature dependences of the magnetization obtained by SQUID reveal the existence of different magnetic phases in different x ranges, viz. weakly ferromagnetic antiferromagnetic, magnetic cluster and paramagnetic phase. For crystals with 0.32 ≤ x ≤ 0.83, the Néel temperatures, TN, have been determined. The magnetometry of these crystals suggests the existence of another magnetic transition at a temperature well below TN, tentatively ascribed to a Morin type transition. Detailed EMR and SQUID studies of the crystal with x ≈ 0.2 reveal the existence of magnetic nanoclusters showing superparamagnetic behaviour. Using a laboratory developed code based on the Monte-Carlo technique, spatial distributions of dia- and paramagnetic ions in the crystal with x ≈ 0.2 has been visualized and possible cluster sizes have been estimated.
dc.language.isoen
dc.publisherElsevier
dc.subject.enIron-gallium borates
dc.subject.enSuperparamagnetism
dc.subject.enElectron magnetic resonance
dc.subject.enSQUID magnetometry
dc.title.enMagnetic structure of mixed iron-gallium borate crystals
dc.title.enEMR and SQUID studies
dc.typeArticle de revue
dc.identifier.doi10.1016/j.jallcom.2023.173105
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Alloys and Compounds
bordeaux.page173105
bordeaux.volume976
bordeaux.hal.laboratoriesLaboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798*
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionCNRS
bordeaux.peerReviewedoui
hal.identifierhal-04500010
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04500010v1
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