Origin of the large dispersion of magnetic properties in nanostructured oxides: FexO/Fe3O4 nanoparticles as a case study
Estrader, Marta (Universitat de Barcelona. Departament de Química Inorgànica)
López-Ortega, Alberto (Università di Firenze. Dipartimento di Chimica)
Golosovsky, I. V. (Peterburgskiĭ institut i︠a︡dernoĭ fiziki im. B.P. Konstantinova)
Estrade, Sonia (Universitat de Barcelona. Departament d'Electrònica)
Gómez Roca, Alejandro (Institut Català de Nanociència i Nanotecnologia)
Salazar Álvarez, Germán (Stockholms universitet. Department of Materials and Environmental Chemistry)
López-Conesa, Lluís (Universitat de Barcelona. Departament d'Electrònica)
Tobia, Dina (Centro Atómico Bariloche)
Winkler, Elin (Centro Atómico Bariloche)
Ardisson, José D. (Centro de Desenvolvimiento da Tecnologia Nuclear. Laboratório de Física Aplicada)
Macedo, Waldemar A. A. (Centro de Desenvolvimiento da Tecnologia Nuclear. Laboratório de Física Aplicada)
Morphis, Andreas (Ethniko Kentro Ereunas Physikōn Epistēmōn "Demokritos")
Vasilakaki, Marianna (Ethniko Kentro Ereunas Physikōn Epistēmōn "Demokritos")
Trohidou, Kalliopi N. (Ethniko Kentro Ereunas Physikōn Epistēmōn "Demokritos")
Gukasov, Arsen (Laboratoire Léon Brillouin)
Mirebeau, Isabelle (Laboratoire Léon Brillouin)
Makarova, O. L. (National Research Centre Kurchatov Institute. Institute for High Energy Physics)
Zysler, Roberto D. (Centro Atómico Bariloche)
Peiro, Francesca (Universitat de Barcelona. Departament d'Electrònica)
Baró, M. D.. (Universitat Autònoma de Barcelona. Departament de Física)
Bergström, Lennart (Stockholms universitet. Department of Materials and Environmental Chemistry)
Nogués, Josep (Institut Català de Nanociència i Nanotecnologia)

Date:	2015
Abstract:	The intimate relationship in transition-metal oxides between stoichiometry and physiochemical properties makes them appealing as tunable materials. These features become exacerbated when dealing with nanostructures. However, due to the complexity of nanoscale materials, establishing a distinct relationship between structure-morphology and functionalities is often complicated. In this regard, in the FexO/Fe3O4 system a largely unexplained broad dispersion of magnetic properties has been observed. Here we show, thanks to a comprehensive multi-technique approach, a clear correlation between magneto-structural properties in large (45 nm) and small (9 nm) FexO/Fe3O4 core/shell nanoparticles that can explain the spread of magnetic behaviors. The results reveal that while the FexO core in the large nanoparticles is antiferromagnetic and has bulk-like stoichiometry and unit-cell parameters, the FexO core in the small particles is highly non-stoichiometric and strained, displaying no significant antiferromagnetism. These results highlight the importance of ample characterization to fully understand the properties of nanostructured metal oxides.
Grants:	European Commission 247518 European Commission 318901 Ministerio de Economía y Competitividad MAT2013-48628-R Ministerio de Economía y Competitividad SEV-2013-0295 Ministerio de Economía y Competitividad MAT2011-27380-C02-01 Ministerio de Economía y Competitividad MAT2010-20616-C02-02 Ministerio de Economía y Competitividad CSD2009-00013 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1015 Agència de Gestió d'Ajuts Universitaris i de Recerca 2011/BP-B00209 Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-35
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Magnetic properties ; Nanostructured oxides ; Nanoparticles
Published in:	Nanoscale, Vol. 7, No. 7 (2015) , p. 3002-3015, ISSN 2040-3372

DOI: 10.1039/C4NR06351A

14 p, 4.5 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Group of Smart Nanoengineered Materials, Nanomechanics and Nanomagnetism (Gnm3)
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles