Literatura científica selecionada sobre o tema "Matériaux composites magnétiques"
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Artigos de revistas sobre o assunto "Matériaux composites magnétiques"
-Henaux, C. "Enjeu des matériaux magnétiques composites pour les machines électriques du futur". Revue de l'Electricité et de l'Electronique -, n.º 08 (2003): 29. http://dx.doi.org/10.3845/ree.2003.093.
Texto completo da fonteTeses / dissertações sobre o assunto "Matériaux composites magnétiques"
Talbot, Philippe. "Introduction à l'étude des matériaux magnétiques composites". Brest, 1993. http://www.theses.fr/1993BRES2010.
Texto completo da fonteRudenko, Vasyl'. "Effets magnétoacoustiques paramétriques dans les matériaux magnétiques diélectriques et composites". Phd thesis, Ecole Centrale de Lille, 2007. http://tel.archives-ouvertes.fr/tel-00291549.
Texto completo da fonteL'influence de la composition des ferrites poly-cristallines à base de nickel sur les sensibilités des vitesses acoustiques aux champs magnétiques DC et RF sont considérées. Un couplage magnéto-élastique maximum de 59% et une sensibilité au champ magnétique de la vitesse des ondes transversales de 100%/kOe ont été trouvées pour la composition Fe2,026Ni0,95Co0,024О4. En utilisation comme milieu actif pour conjugaison de phase paramétrique, cette composition a démontré un incrément d'amplification extraordinaire de 4.5 μs-1.
Une méthode impulsionnelle amplitude-phase (IAP) originale a été élaborée et appliquée à l'étude de la sensibilité paramétrique de matériaux actifs intéressants pour les perspectives possédant une faible impédance acoustique (≈9 MRa): composites à base de Terfenol-D et ferrites poreuses de nickel. Les sensibilités de la vitesse acoustique au champ magnétique AC trouvées étaient de 4.39%/kOe et 3.39%/kOe dans le composite et la ferrite poreuse respectivement.
Un nouveau phénomène paramétrique acoustique d'excitation de trois phonons liésa été observé dans les cristaux antiferromagnétiques de type “plan-facile” α-Fe2O3 sous pompage magnétique transversal AC. Les modes sous-critiques et super-critiques de ces excitations à trios phonons ont été étudiés par la méthode IAP et décrits théoriquement. La particularité du mode super-critique est la formation d'une singularité pour une durée de pompage finie. Cette singularité est stabilisée par la nonlinéarité intrinsèque du système de phonon.
Galicia, Alberto. "Matériaux composites : association de gels polymères et de nanoparticules magnétiques". Paris 6, 2003. http://www.theses.fr/2003PA066377.
Texto completo da fonteRudenko, Vasyl’ Viktorovitch. "Effets magnétoacoustiques paramétriques dans les matériaux magnétiques diélectriques et composites". Ecole Centrale de Lille, 2007. http://tel.archives-ouvertes.fr/index.php?view_this_doc=tel-00291549&extended_view=1&version=1&halsid=rvolvpnito1r5t694auconrvs5.
Texto completo da fonteParametric interaction in active magnetoacoustic materials of various composition and structures is studied experimentally. Influence of composition of nickel-based polycrystalline ferrite on sensitivity of sound velocities to DC and RF magnetic field is considered. Maximum magnetoelastic coupling 59% and magnetic sensitivity of shear wave velocity 100%/kOe were found for composition Fe2,026Ni0,95Co0,024О4. In the testing as an active medium for parametric wave phase conjugation this composition demonstrated extraordinary gain increment 4. 5 μs-1. Original amplitude-phase pulse (APP) method was elaborated and applied for studies of parametric sensitivity of perspective active materials with low (≈9 MRa) acoustic impedance: Terfenol-D based composite and porous nickel ferrite. Sensitivity of sound velocity to AC magnetic field is found as 4. 39%/kOe and 3. 39%/kOe in the composite and porous ferrite respectively. The new parametric acoustic phenomenon of three-phonon bound excitation is observed in “easy plane” antiferromagnetic crystal α-Fe2O3 under transversal AC magnetic pumping. Sub-threshold and supercritical modes of the three-phonon excitations were studied by the APP method and described theoretically. The specific feature of the supercritical mode is forming of singularity in a finite pumping duration. Singularity is stabilized by intrinsic nonlinearity in the phonon system
Dudek, Christophe. "Étude de matériaux hyperfréquences innovants : des microfils nanocristallisés aux composites magnétiques artificiels". Tours, 2006. http://www.theses.fr/2006TOUR4011.
Texto completo da fonteThis thesis concerns the development of new concepts in the microwave's magnetic materials field. Based on a multiple approach of the dynamic permeability, several attempts have been carried out. On the one hand, the study of nanocrystallized ferromagnetic glass-coated microwires has led, for the first time, to significant permeability levels up to 4 GHz at 350°C. On the other hand, a new type of metamaterial made of ferromagnetic core combined with copper helices has exhibited a large band microwave permeability. Eventually, the analysis of the magnetic response of magnets as part of mechanical systems has evidenced the concept of vibrating inductor in a magnetic field. This new technology seems to offer great potential gains
Cyr, Charles. "Modélisation et caractérisation des matériaux magnétiques composites doux utilisés dans les machines électriques". Phd thesis, Université Laval, 2007. http://pastel.archives-ouvertes.fr/pastel-00003791.
Texto completo da fonteFang, Weiqing. "Elaboration de matériaux composites nanofils magnétiques/polymères pour la fabrication d'aimants permanents". Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-01070641.
Texto completo da fonteChevalier, Alexis. "Etude expérimentale, élaboration et modélisation de matériaux composites à base de poudres magnétiques douces". Brest, 1998. https://tel.archives-ouvertes.fr/tel-00484041.
Texto completo da fonteMorin, Victor. "Elaboration de composites multiférroïque et caractérisation de l'effet magnétoélectrique". Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLN030/document.
Texto completo da fonteThe magnetoelctric (ME) response consists in the modification of the electric polarization by an applied magnetic field (direct effect) or the modification of the magnetic polarization by an applied electric field (inverse effect). Intrinsic multiferroics are rather uncommon and the effect is often weak at room temperature. An alternative route to achieve ME effect, consists in using magnetostrictive and piezoelectric materials and coupling the two phases by mechanical stress. We draw (theoretically and experimentally) some material characteristics to achieve an importantME effect, which justify the use of ferrite and PZT. We describe the production process of the two studied connectivity schemes (stack of layers or inclusion of a phase in another). We focus on the sintering by Spark Plasma Sintering as a potential improvement of the mecanical bonding. We devoted a part of our work on multilayer composite and showed the importance of some factors such as the demagnetizing effect or the symmetry of the structure. We introduce a current sensor prototype suitable for electrical engineering application. We showed its good linearity and sensitivity but also some effects of its bandwidth
Deprot, Sylvie. "Élaboration de micro-filaments composites : des caractéristiques physico-chimiques aux propriétés magnétiques". Tours, 2003. http://www.theses.fr/2003TOUR4004.
Texto completo da fonteAdvances in the elaboration, understanding and engineering of the static and dynamic magnetic properties of amorphous glass-coated ferromagnetic microwires are presented. The control of the geometric characteristics of the microwires has been obtained through a careful parametric elaboration process study. That led to propose innovative modifications of the production apparatus to reach a continuous process. The magnetic anisotropy of these wires is mainly due to a magneto-elastic behavior. This has been evidenced through the experimental demonstration of the effects of the alloy composition and of the stress state of the ferromagnetic core on the static magnetic properties. Microwave properties of the ferromagnetic microwires were studied through their permeability spectra. They were described using a gyromagnetic model taking into account skin effect. The understanding of their static magnetic properties led to the engineering of the dynamic properties of the ferromagnetic microwires
Livros sobre o assunto "Matériaux composites magnétiques"
Magnetic Oxides and Composites. Millersville, PA: Materials Research Forum LLC, 2018.
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