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Title: Origin of the large dispersion of magnetic properties in nanostructured oxides: FexO/Fe3O4 nanoparticles as a case study
Author: 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
Keywords: Òxids
Propietats magnètiques
Magnetic properties
Issue Date: 31-Dec-2015
Publisher: Royal Society of Chemistry
Abstract: 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.
Note: Versió postprint del document publicat a:
It is part of: Nanoscale, 2015, vol. 7, p. 3002-3015
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ISSN: 2040-3364
Appears in Collections:Publicacions de projectes de recerca finançats per la UE
Articles publicats en revistes (Química Inorgànica i Orgànica)

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