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

The intimate relationship between stoichiometry and physicochemical properties in transition-metal oxides 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 rela...

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Detalles Bibliográficos
Autores: Estrader i Bofarull, Marta, López-Ortega, Alberto, Golosovsky, Igor V., Estradé Albiol, Sònia, Roca, Alejandro G., Salazar-Alvarez, German, López Conesa, Lluís, Tobia, Dina, Winkler, Elin, Ardisson, José D., Macedo, Waldemar A. A., Morphis, Andreas, Vasilakaki, Marianna, Trohidou, Kalliopi N., Gukasov, Arsen, Mirebeau, Isabelle, Makarova, O. L., Zysler, Roberto D., Peiró Martínez, Francisca, Baró, M. D., Bergström, Lennart, Nogués, Josep
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2015
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/154884
Acceso en línea:https://hdl.handle.net/2445/154884
Access Level:acceso abierto
Palabra clave:Òxids
Nanopartícules
Propietats magnètiques
Oxides
Nanoparticles
Magnetic properties
Descripción
Sumario:The intimate relationship between stoichiometry and physicochemical properties in transition-metal oxides 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 the 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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