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Start Over Author "Estradé, Sònia" Journal nanoscale
10 results on '"Estradé, Sònia"'

1. Origin of the large dispersion of magnetic properties in nanostructured oxides: FexO/Fe3O4nanoparticles as a case study

Author

Estrader, Marta, primary, López-Ortega, Alberto, additional, Golosovsky, Igor V., additional, Estradé, Sònia, additional, Roca, Alejandro G., additional, Salazar-Alvarez, German, additional, López-Conesa, Lluís, additional, Tobia, Dina, additional, Winkler, Elin, additional, Ardisson, José D., additional, Macedo, Waldemar A. A., additional, Morphis, Andreas, additional, Vasilakaki, Marianna, additional, Trohidou, Kalliopi N., additional, Gukasov, Arsen, additional, Mirebeau, Isabelle, additional, Makarova, O. L., additional, Zysler, Roberto D., additional, Peiró, Francesca, additional, Baró, Maria Dolors, additional, Bergström, Lennart, additional, and Nogués, Josep, additional

Published
2015
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6. Controlled 3D-coating of the pores of highly ordered mesoporous antiferromagnetic Co3O4 replicas with ferrimagnetic FexCo3−xO4 nanolayers

Author

Pellicer, Eva, primary, Cabo, Moisés, additional, López-Ortega, Alberto, additional, Estrader, Marta, additional, Yedra, Lluís, additional, Estradé, Sònia, additional, Peiró, Francesca, additional, Saghi, Zineb, additional, Midgley, Paul, additional, Rossinyol, Emma, additional, Golosovsky, Igor V., additional, Mayoral, Alvaro, additional, Prades, Joan D., additional, Suriñach, Santiago, additional, Baró, Maria Dolors, additional, Sort, Jordi, additional, and Nogués, Josep, additional

Published
2013
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7. Origin of the large dispersion of magnetic properties in nanostructured oxides: FexO/Fe3O4 nanoparticles as a case study.

Author

Estrader, Marta, López-Ortega, Alberto, Golosovsky, Igor V., Estradé, 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, Francesca, and Baró, Maria Dolors

Published
2015
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9. Origin of the large dispersion of magnetic properties in nanostructured oxides: Fe(x)O/Fe3O4 nanoparticles as a case study.

Author

Estrader M, López-Ortega A, Golosovsky IV, Estradé S, Roca AG, Salazar-Alvarez G, López-Conesa L, Tobia D, Winkler E, Ardisson JD, Macedo WA, Morphis A, Vasilakaki M, Trohidou KN, Gukasov A, Mirebeau I, Makarova OL, Zysler RD, Peiró F, Baró MD, Bergström L, and Nogués J

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.

Published
2015
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10. Controlled 3D-coating of the pores of highly ordered mesoporous antiferromagnetic Co3O4 replicas with ferrimagnetic Fe(x)Co(3-x)O4 nanolayers.

Author

Pellicer E, Cabo M, López-Ortega A, Estrader M, Yedra L, Estradé S, Peiró F, Saghi Z, Midgley P, Rossinyol E, Golosovsky IV, Mayoral A, Prades JD, Suriñach S, Baró MD, Sort J, and Nogués J

Abstract

The controlled filling of the pores of highly ordered mesoporous antiferromagnetic Co3O4 replicas with ferrimagnetic FexCo3-xO4 nanolayers is presented as a proof-of-concept toward the integration of nanosized units in highly ordered, heterostructured 3D architectures. Antiferromagnetic (AFM) Co3O4 mesostructures are obtained as negative replicas of KIT-6 silica templates, which are subsequently coated with ferrimagnetic (FiM) FexCo3-xO4 nanolayers. The tuneable magnetic properties, with a large exchange bias and coercivity, arising from the FiM/AFM interface coupling, confirm the microstructure of this novel two-phase core-shell mesoporous material. The present work demonstrates that ordered functional mesoporous 3D-materials can be successfully infiltrated with other compounds exhibiting additional functionalities yielding highly tuneable, versatile, non-siliceous based nanocomposites.

Published
2013
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