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Title

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

AuthorsEstrader, Marta ; López-Ortega, Alberto; Golosovsky, I. V.; Estradé, S.; Roca, Alejandro G. ; Salazar-Álvarez, G.; Vasilakaki, Marianna; Trohidou, Kalliopi N.; Peiró, F.; Baró, M. D.; Nogués, Josep
Issue Date2015
PublisherRoyal Society of Chemistry (UK)
CitationNanoscale 7(7): 3002-3015 (2015)
AbstractThe 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.
DescriptionThis article is licensed under a Creative Commons Attribution 3.0 Unported Licence.-- et al.
Publisher version (URL)http://dx.doi.org/10.1039/C4NR06351A
URIhttp://hdl.handle.net/10261/131785
DOI10.1039/C4NR06351A
Identifiersdoi: 10.1039/C4NR06351A
issn: 2040-3364
e-issn: 2040-3372
Appears in Collections:(CIN2) Artículos
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