Title:
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Origin of the large dispersion of magnetic properties in nanostructured oxides: FexO/Fe3O4 nanoparticles as a case study
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Author:
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Estrader, Marta; López-Ortega, Alberto; Golosovsky, I. V.; Estrade, Sonia; Gómez Roca, Alejandro; Salazar Álvarez, Germán; 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.; Peiro, Francesca; Baró, M. D..; Bergström, Lennart; Nogués, Josep
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Abstract:
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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 |
Subject(s):
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-Magnetic properties -Nanostructured oxides -Nanoparticles |
Rights:
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open access
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https://creativecommons.org/licenses/by/2.0/ |
Document type:
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Article |
Published by:
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Share:
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Uri:
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https://ddd.uab.cat/record/128070
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