Estrader i Bofarull, MartaLópez-Ortega, AlbertoGolosovsky, Igor V.Estradé Albiol, SòniaRoca, Alejandro G.Salazar-Alvarez, GermanLópez Conesa, LluísTobia, DinaWinkler, ElinArdisson, José D.Macedo, Waldemar A. A.Morphis, AndreasVasilakaki, MariannaTrohidou, Kalliopi N.Gukasov, ArsenMirebeau, IsabelleMakarova, O. L.Zysler, Roberto D.Peiró Martínez, FranciscaBaró, M. D.Bergström, LennartNogués, Josep2020-04-022020-04-022015-12-312040-3364https://hdl.handle.net/2445/154884The 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.14 p.application/pdfeng(c) Estrader i Bofarull, Marta et al., 2015ÒxidsNanopartículesPropietats magnètiquesOxidesNanoparticlesMagnetic propertiesinfo:eu-repo/semantics/article6457052020-04-02info:eu-repo/semantics/openAccess