Origin of the large dispersion of magnetic properties in nanostructured oxides: FexO/Fe3O4 nanoparticles as a case study

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 relat...

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Detalles Bibliográficos
Autores: Estrader i Bofarull, Marta|||0000-0003-3379-8234, López-Ortega, Alberto|||0000-0003-3440-4444, Golosovsky, I. V., Estrade, Sonia|||0000-0002-3340-877X, Gómez Roca, Alejandro|||0000-0001-6610-9197, Salazar Álvarez, Germán|||0000-0002-0671-435X, López-Conesa, Lluís, Tobia, Dina, Winkler, Elin, Ardisson, José D., Macedo, Waldemar A. A., Morphis, Andreas, Vasilakaki, Marianna, Trohidou, Kalliopi N., Gukasov, Arsen|||0000-0003-2763-468X, Mirebeau, Isabelle, Makarova, O. L., Zysler, Roberto D., Peiro, Francesca|||0000-0002-5697-0554, Baró, M. D.|||0000-0002-8636-1063, Bergström, Lennart, Nogués, Josep|||0000-0003-4616-1371
Tipo de recurso: artículo
Fecha de publicación:2015
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:128070
Acceso en línea:https://ddd.uab.cat/record/128070
https://dx.doi.org/urn:doi:10.1039/C4NR06351A
Access Level:acceso abierto
Palabra clave:Magnetic properties
Nanostructured oxides
Nanoparticles
Descripción
Sumario: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.

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