| 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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Aguirre, Myriam Haydee
Universidad de Zaragoza
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2024Intrinsic and extrinsic relaxation mechanisms for controlling spin current intensity in Fe 100-x Co x /bilayers
- 2023Oxygen vacancy dynamics in Pt/TiO<sub>x</sub>/TaO<sub>y</sub>/Pt memristors: exchange with the environment and internal electromigrationcitations
- 2023Annealing effects on the magnetic and magnetotransport properties of iron oxide nanoparticles self-assembliescitations
- 2017Thermoelectric Skutterudite/oxide nanocompositescitations
- 2010Emergent behavior of nano-multilayered coatings during dry high-speed machining of hardened tool steelscitations
- 2010TEM, chemical etching and FTIR characterization of ZnTe grown by physical vapor transportcitations
- 2009Impact of Al and Cr alloying in TiN-based PVD coatings on cutting performance during machining of hard to cut materialscitations
- 2009Influence of Group IV-Te Alloying on Nanocomposite Structure and Thermoelectric Properties of Bi2Te3 Compoundscitations
- 2008THE DEVELOPMENT OF THERMOELECTRIC OXIDES WITH PEROVSKITE-TYPE STRUCTURES FOR ALTERNATIVE ENERGY TECHNOLOGIES
- 2008Structure, microstructure, and high-temperature transport properties of La(1-x)Ca(x)MnO(3-delta) thin films and polycrystalline bulk materialscitations
- 2008Synthesis of Supported Single-Crystalline Organic Nanowires by Physical Vapor Depositioncitations
Places of action
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article
Annealing effects on the magnetic and magnetotransport properties of iron oxide nanoparticles self-assemblies
Abstract
<jats:title>Abstract</jats:title><jats:p>In magnetic tunnel junctions based on iron oxide nanoparticles the disorder and the oxidation state of the surface spin as well as the nanoparticles functionalization play a crucial role in the magnetotransport properties. In this work, we report a systematic study of the effects of vacuum annealing on the structural, magnetic and transport properties of self-assembled ∼10 nm Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> nanoparticles. The high temperature treatment (from 573 to 873 K) decomposes the organic coating into amorphous carbon, reducing the electrical resistivity of the assemblies by 4 orders of magnitude. At the same time, the 3.Fe<jats:sup>2+</jats:sup>/(Fe<jats:sup>3+</jats:sup>+Fe<jats:sup>2+</jats:sup>) ratio is reduced from 1.11 to 0.13 when the annealing temperature of the sample increases from 573 to 873 K, indicating an important surface oxidation. Although the 2 nm physical gap remains unchanged with the thermal treatment, a monotonous decrease of tunnel barrier width was obtained from the electron transport measurements when the annealing temperature increases, indicating an increment in the number of defects and hot-spots in the gap between the nanoparticles. This is reflected in the reduction of the spin dependent tunneling, which reduces the interparticle magnetoresistance. This work shows new insights about influence of the nanoparticle interfacial composition, as well their the spatial arrangement, on the tunnel transport of self-assemblies, and evidence the importance of optimizing the nanostructure fabrication for increasing the tunneling current without degrading the spin polarized current.</jats:p>