| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Boada, Roberto
Universitat Autònoma de Barcelona
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2021Photon-in/photon-out spectroscopy at the I20-scanning beamline at diamond light sourcecitations
- 2019Toward the Optimized Spintronic Response of Sn-Doped IrO <inf>2</inf> Thin Filmscitations
- 2016Effect of titania doping and sintering temperature on titanium local environment and electrical conductivity of YSZcitations
- 2014Structural determination of Bi-doped magnetite multifunctional nanoparticles for contrast imagingcitations
- 2014Structural determination of Bi-doped magnetite multifunctional nanoparticles for contrast imagingcitations
- 2014Relationships between structural and electrical properties in mixed conductors duplex materials in the ZrO2-Y2O3-TiO2 ternary systemcitations
- 2013XANES and EXAFS study of the local order in nanocrystalline yttria-stabilized zirconiacitations
- 2012Interfacial magnetic coupling between Fe nanoparticles in Fe-Ag granular alloyscitations
- 2011Enhanced protection of carbon-encapsulated magnetic nickel nanoparticles through a sucrose-based synthetic strategycitations
- 2011XMCD study of the induced magnetic moment in non-magnetic Ga and Ge atoms in intermetallic compounds
- 2010Ionic conductivity of nanocrystalline yttria-stabilized zirconiacitations
- 2010Microstructure and magnetism of nanoparticles with γ-Fe core surrounded by α-Fe and iron oxide shellscitations
- 2009Stress-induced curie temperature increase in the Fe64Ni 36 invar alloycitations
Places of action
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article
Microstructure and magnetism of nanoparticles with γ-Fe core surrounded by α-Fe and iron oxide shells
Abstract
<p>Iron-carbon nanocomposites have been elaborated by means of a simple chemical procedure based on in situ synthesis of iron nanoparticles within the nanopores of an activated carbon. The Fe nanoparticles present a broad particle-size distribution (5-40 nm). A combined structural and magnetic study seems to suggest that most of the nanoparticles of mean size ∼15 nm have exotic "onionlike" core-shell morphology of γ-Fe nucleus surrounded by a concentric double shell of α-Fe and maghemitelike oxide. The true nature of Fe-oxide was successfully evidenced through room temperature x-ray absorption spectroscopy. The whole system does not reach a fully superparamagnetic regime even at 750 K, probably due to higher blocking temperatures for the largest nanoparticles. Mössbauer spectrometry indicates that low temperature para-to-antiferromagnetic transition for the γ-Fe phase cannot be discarded. In addition, the external Fe-oxide shell exhibits spin-glass behavior giving rise to the freezing of its magnetic moments at low temperatures. Hence, we propose a competing double magnetic coupling: (i) the oxide shell/ α-Fe interaction and (ii) the possible antiferromagnetic coupling between γ-Fe nucleus and α-Fe layer; as being both responsible for the observed exchange bias effect at T=K (H <sub>ex</sub> ≈ 150 Oe).</p>