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183 results on '"Genevois, C."'

9. Transmission electron microscopy and ferromagnetic resonance investigations of tunnel magnetic junctions using Co2MnGe Heusler alloy as magnetic electrodes

Author

Belmeguenai, M., Genevois, C., Zighem, F., Roussigné, Y., Chérif, S-M., Westerholt, K., Bahoui, A. El, Fnidiki, A., and Moch, P.

Subjects
Condensed Matter - Materials Science
Abstract

HRTEM, nano-beam electronic diffraction, energy dispersive X-rays scanning spectroscopy, Vibrating Sample Magnetometry (VSM) and FerroMagnetic Resonance (FMR) techniques are used in view of comparing (static and dynamic) magnetic and structural properties of Co2MnGe (13 nm)/Al2O3 (3 nm)/Co (13 nm) tunnel magnetic junctions (TMJ), deposited on various single crystalline substrates (a-plane sapphire, MgO(100) and Si(111)). They allow for providing a correlation between these magnetic properties and the fine structure investigated at atomic scale. The Al2O3 tunnel barrier is always amorphous and contains a large concentration of Co atoms, which, however, is significantly reduced when using a sapphire substrate. The Co layer is polycrystalline and shows larger grains for films grown on a sapphire substrate. The VSM investigation reveals in-plane anisotropy only for samples grown on a sapphire substrate. The FMR spectra of the TMJs are compared to the obtained ones with a single Co and Co2MnGe films of identical thickness deposited on a sapphire substrate. As expected, two distinct modes are detected in the TMJs while only one mode is observed in each single film. For the TMJ grown on a sapphire substrate the FMR behavior does not significantly differ from the superposition of the individual spectra of the single films, allowing for concluding that the exchange coupling between the two magnetic layers is too small to give rise to observable shifts. For TMJs grown on a Si or on a MgO substrate the resonance spectra reveal one mode which is nearly identical to the obtained one in the single Co film, while the other observed resonance shows a considerably smaller intensity and cannot be described using the magnetic parameters appropriate to the single Co2MnGe film., Comment: 11 pages, 10 figures, Thin Solid Films

Published
2013
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10. Magnetization dynamics in Co2$MnGe/Al2$O3$/Co tunnel junctions grown on different substrates

Author

Belmeguenai, M., Tuzcuoglu, H., Zighem, F., Chérif, S-M., Roussigné, Y., Moch, P., Westerholt, K., Bahoui, A. El, Genevois, C., and Fnidiki, A.

Subjects
Condensed Matter - Materials Science
Abstract

We study static and dynamic magnetic properties of Co2MnGe (13 nm)/Al2O3 (3 nm)/Co (13 nm) tunnel magnetic junctions (TMJ), deposited on various single crystalline substrates (a-plane sapphire, MgO(100), Si(111)). The results are compared to the magnetic properties of Co and of Co$_{2}$MnGe single films lying on sapphire substrates. X-rays diffraction always shows a (110) orientation of the Co$_{2}$MnGe films. Structural observations obtained by high resolution transmission electron microscopy confirmed the high quality of the TMJ grown on sapphire. Our vibrating sample magnetometry measurements reveal in-plane anisotropy only in samples grown on a sapphire substrate. Depending on the substrate, the ferromagnetic resonance spectra of the TMJs, studied by the microstrip technique, show one or two pseudo-uniform modes. In the case of MgO and of Si substrates only one mode is observed: it is described by magnetic parameters (g-factor, effective magnetization, in-plane magnetic anisotropy) derived in the frame of a simple expression of the magnetic energy density; these parameters are practically identical to those obtained for the Co single film. With a sapphire substrate two modes are present: one of them does not appreciably differ from the observed mode in the Co single film while the other one is similar to the mode appearing in the Co$_{2}$MnGe single film: their magnetic parameters can thus be determined independently, using a classical model for the energy density in the absence of interlayer exchange coupling., Comment: 5 pages, 6 figures

Published
2013
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31. No-kill in restocking programs: Advances in non lethal detection of fluorochromes in marked juveniles, glass eel case study

Author

Gaillard, M., Edith PARLANTI, Sourzac, M., Couillaud, F., Genevois, C., Sébastien Boutry, Rigaud, C., Françoise Daverat, Ecosystèmes aquatiques et changements globaux (UR EABX), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Environnements et Paléoenvironnements OCéaniques (EPOC), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), UNIVERSITE VICTOR SEGALEN BORDEAUX FRA, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), LABORATORY FOR MOLECULAR AND FUNCTIONAL IMAGING ERT CNRS, and Irstea Publications, Migration

Subjects
[SDE] Environmental Sciences, endocrine system, animal structures, [SDE]Environmental Sciences
Abstract

International audience; Restocking is one of the alternatives measures that have been widely used as a measure of remediation of ichthyologic biodiversity loss. To assess restocking efficiency, mass-marking provided the discrimination of restocked fish compared to wild fish. The use of fluorochromes recorded in the calcified structures such as otoliths has been used extensively to detect marked fish. However, reading mark on otolith requires the sacrifice of the fish. European eel recruitment collapsed down to 1% of 1980s levels. Within European eel management plan, restocked glass eel are marked with Alizarine Red S (ARS 150 ppm). The aim of our study was to implement a nonlethal ARS mark detection method using modern techniques of microscopy, imaging and fluorimetry. Batches of ARS marked and unmarked glass eels within a restocking protocol were collected before they were translocated. For marked and unmarked glass eels, ARS detection mark was assayed i) on glass eel fins with a binocular microscope, ii) on anesthetized glass eels using a fluorescence reflectance imager and iii) on a piece of caudal glass eel fins using fluorimeter. Among the three alternative methods tested, non-lethal ARS detection using fluorimeter appeared to be most efficient, the easiest method and the cheapest method. Overall, the present results provided a widely applicable, easy and non-lethal method to researchers and managers for detecting endangered marked fish.

Published
2019

34. Contribution of the in situ high temperature powder diffraction to the study of crystallization from glass

Author

Veron, E., Boyer, M., Genevois, C., Fernandez-Carrion, AJ., Chenu, Sébastien, Suchomel, M., Porcher, F., Matzen, G., Allix, M., Axe 3 : organisation structurale multiéchelle des matériaux (SPCTS-AXE3), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM), DERORY, BEATRICE, Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.MATE] Chemical Sciences/Material chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, [SPI.MAT] Engineering Sciences [physics]/Materials, ComputingMilieux_MISCELLANEOUS, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience

Published
2017

39. Evaluation of T2g Band Intensity Distribution Across a Surface of an UO2 Ceramic.

Author

Maslova, O. A., Iltis, X., Desgranges, L., Guimbretière, G., Ammar, M. R., Genevois, C., de Bilbao, E., Canizares, A., Barannikova, S. A., Leontyev, I. N., and Simon, P.

Subjects
URANIUM oxides, ENERGY bands, CERAMIC materials, METALLIC surfaces, RAMAN spectroscopy
Abstract

The present work is aimed at calculating the intensities of the intrinsic T2g band through an UO2 ceramic surface using electron back-scattering diffraction data. The theoretical intensity distribution is displayed in the form of a color-scale image and compared with an experimental Raman imaging map to establish circumstances of the T2g intensity variation within the UO2 ceramic surface and to determine the crystalline orientations. The results evidence a quite good coincidence between theory and experiment, although some grains highlight pronounced differences in T2g intensities for both maps. One therefore implies other “side” effects which make contribution to the T2g intensity behavior within a UO2 ceramic surface, such as different penetration depths of exciting beams in EBSD and Raman spectroscopy, or local stoichiometric changes. [ABSTRACT FROM AUTHOR]

Published
2018
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40. Fibres optiques multimatériaux à cœur vitrocéramique par le procédé 'powder in tube'

Author

Pomarede, D., Auguste, Jean-Louis, Humbert, Georges, Chenu, Sébastien, Delaizir, Gaëlle, Duclere, Jean-René, Allix, Mathieu, Genevois, C., Veron, E., Roy, Philippe, Thomas, Philippe, Matzen, Guy, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Axe 3 : organisation structurale multiéchelle des matériaux (SPCTS-AXE3), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Société Française d'Optique (SFO), and DERORY, BEATRICE

Subjects
[CHIM.MATE] Chemical Sciences/Material chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, [SPI.MAT] Engineering Sciences [physics]/Materials, ComputingMilieux_MISCELLANEOUS, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience

Published
2016

41. Fibres optiques vitrocéramiques par le procédé «powder in tube »

Author

Pomarede, D., Auguste, JL., Humbert, G, Chenu, Sébastien, Delaizir, Gaëlle, Duclere, Jean-René, Allix, M., Genevois, C., Veron, E., Roy, Pascal, Thomas, Philippe, Matzen, G., DERORY, BEATRICE, Axe 3 : organisation structurale multiéchelle des matériaux (SPCTS-AXE3), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), IRCER - Axe 3 : organisation structurale multiéchelle des matériaux (IRCER-AXE3), Institut de Recherche sur les CERamiques (IRCER), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut des Procédés Appliqués aux Matériaux (IPAM), and Axe 3 : organisation structurale multiéchelle des matériaux

Subjects
[CHIM.MATE] Chemical Sciences/Material chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, [SPI.MAT] Engineering Sciences [physics]/Materials, ComputingMilieux_MISCELLANEOUS, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience

Published
2016

44. Direct imaging of rare-earth ion clusters inYb:CaF2

Author

Lacroix, B., primary, Genevois, C., additional, Doualan, J. L., additional, Brasse, G., additional, Braud, A., additional, Ruterana, P., additional, Camy, P., additional, Talbot, E., additional, Moncorgé, R., additional, and Margerie, J., additional

Published
2014
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