Letteratura scientifica selezionata sul tema "Aimantation en dynamique"
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Articoli di riviste sul tema "Aimantation en dynamique":
Fratila, Luana, Olivier Geoffroy e Jean-Louis Porteseil. "Aimantation dynamique dans les FeSi Goss". Revue internationale de génie électrique 5, n. 2 (30 giugno 2002): 311–23. http://dx.doi.org/10.3166/rige.5.311-323.
Rose, Catherine V., Adam C. Maloof, Blair Schoene, Ryan C. Ewing, Ulf Linnemann, Mandy Hofmann e John M. Cottle. "The End-Cryogenian Glaciation of South Australia". Geoscience Canada 40, n. 4 (20 dicembre 2013): 256. http://dx.doi.org/10.12789/geocanj.2013.40.019.
Tesi sul tema "Aimantation en dynamique":
Ouari, Bachir. "Dynamique de l'aimantation des particules superparamagnétique avec anisotropie triaxiale". Perpignan, 2006. http://www.theses.fr/2006PERP0739.
In this thesis, a theoretical study of the dynamics of the magnetization of superparamagnetic nanoparticles with triaxial (orthorhombic) anisotropy has been carried out using the Néel-Brown model. Numerical and analytical solutions of the Fokker-Planck equation given by Brown, which describes the relaxation of the magnetization in the nanoparticles, have been obtained in order to facilitate this study. The process of relaxation of the magnetization is characterized by the longest relaxation time, integral relaxation time, and, in the frequency domain, by the longitudinal and transverse components of the magnetic susceptibility tensor. The numerical solutions allows us to evaluate these characteristics for typical values of the dissipation constant α, temperature T, anisotropy constants with and without a uniform external magnetic field H0. By using the approach of Kramers-Brown-Coffey, analytical equations for the magnetization relaxation times and for the longitudinal and transversals components of the magnetic susceptibility have been deduced. These analytical equations are in complete agreement with the results of our numerical calculations. They have simple analytical forms and allow one to quantify the dependence of the relaxation times and the magnetic susceptibility on the temperature T, angular frequency , strength of the external field H, and dissipation constant α. Moreover they can be used to estimate the relaxation times and the magnetic susceptibility in wide ranges of variation of T,, H, and α. The results obtained may be considered as a complete solution of the problem of relaxation of the magnetization in nano particles with triaxial anisotropy
Deb, Marwan. "Spectroscopie magnéto-optique de grenat magnétique de bismuth fer : études statique et dynamique". Versailles-St Quentin en Yvelines, 2013. http://www.theses.fr/2013VERS0065.
The objective of this thesis is the extensive study of the magnetic, magneto-optical (MO) and electronic properties of the bismuth iron garnet (Bi3Fe5O12, BIG). BIG is a novel transparent magnetic material with exceptional MO properties. The first part of the thesis presents the studies of the static MO properties of BIG performed over a wide range of thickness (5nm-220nm) of photon energy (5nm-220nm) and of temperature (5K-740K). The obtained results have allowed understanding several intrinsic properties of this complex material such as its abnormal hysteresis loops and its electronic band structure. In the second part of the thesis, the optically induced magnetization dynamics has been studied. We have demonstrated that the excitation of BIG with linearly or circularly polarized femtosecond laser pulse triggers a coherent precession of the magnetization
Fessant, Alain. "Etude de la dynamique d'aimantation dans les couches minces magnétiques amorphes". Brest, 1991. http://www.theses.fr/1991BRES2028.
Venuat, Julien. "Etude statique et dynamique du renversement d'aimantation de petits objets d'anisotropie perpendiculaire". Université Louis Pasteur (Strasbourg) (1971-2008), 2006. https://publication-theses.unistra.fr/public/theses_doctorat/2006/VENUAT_Julien_2006.pdf.
This work deals with the study of the magnetization reversal of submicrometric dots with perpendicular anisotropy. The 1st part describes the fabrication of the dots (characteristic size between 200nm and 1μm) by e-beam lithography and ionic beam etching from continuous CoPt3 films and (CoxPt10Å)nx multilayers. Moreover, a magnetic field up to 1. 5T is applied via a micro-coil that is lithographied directly on the dots network. The study of the magnetic properties, described in the 2nd part of this manuscript, shows that the alloy films and the multilayers with tCo<0. 7nm present a perpendicular anisotropy. Magneto-optic experiments with Kerr effect prove that the coercivity of the dots increases when their size decreases. This tendency can be explained by the reversal mode that is dominated by the propagation of the domains walls, which is limited by the size of the dots. Finally, the 1st steps of the magnetization reversal of the dots under magnetic impulsions of few ns was observed by MFM experiments
Venuat, Julien Kappler Jean-Paul. "Etude statique et dynamique du renversement d'aimantation de petits objets d'anisotropie perpendiculaire". Strasbourg : Université Louis Pasteur, 2007. http://eprints-scd-ulp.u-strasbg.fr:8080/782/01/Venuat2006.pdf.
Franco, Galeano Andres Felipe. "Effets de couplage sur la dynamique de couches magnétiques". Perpignan, 2012. http://www.theses.fr/2012PERP1106.
Due to its potential applications in the industry of magnetic recording media and the rapidly developing field of spintronics, the physics of stacked magnetic nanostructures has attracted a growing interest from the scienfic community during the last decades. One of the underlying issues of the multilayered magnetic systems used concerns the origin and effect of interlayer coupling as it plays a crucial role in the optimization of the magnetization switching. Accordingly, we have devoted the large part of the present thesis work to the study of the effect of such a coupling by considering various types thereof, and the switching mechanisms and magnetization profile they entail. We believe that our work will contribute to further optimizing the physical properties of magnetic multilayers as promising candidates for efficient information storage on magnetic media such as the Magnetic Random Access Memory (MRAM)
Raquet, Bertrand. "Dynamique d'aimantation dans une couche ultramince ferromagnétique. Application au système or/cobalt/or". Toulouse, INSA, 1996. http://www.theses.fr/1996ISAT0043.
Zagdoud, Amani. "Dynamique d’aimantation des systèmes ferromagnétiques induite par des impulsions laser femtosecondes dans le domaine spectral infrarouge". Strasbourg, 2011. https://publication-theses.unistra.fr/restreint/theses_doctorat/2011/ZAGDOUD_Amani_2011.pdf.
The aim of the study is to show how the ultrafast demagnetization and the subsequent rapid re-magnetization occur when exciting a ferromagnetic material with low energy infrared pulses. Towards that goal, we have used mid-infrared femtosecond laser pulses (l = [3-10 µm]) to excite CoPt3, Ni and Co ferromagnetic thin films. The magneto-optical response is then probed in the visible (l = 798 nm). Our results show that even though only intraband transitions occur, the demagnetization process and its subsequent relaxation to the lattice and to the environnement are still the dominant processes involved in the magnetization dynamics. We also show that the material band structure is important to interpret the thermalization synamics of the spins that occur before the heating of the lattice. For specific experimental configurations, we show that it is possible to induce a motion of precession of the magnetization around the effectif magnetic field and observe it while it is damped. Such approach gives an accurate description of the precession dynamics that can be modelled with Landau-Lifschitz Gilbert equations. The magnetization dynamics induced at 6. 5 µm in nickel shows an oscillatory behaviour with a period of 2 ps. Those oscillations are indpendents from the external magnetic filed angle, the pump intensity and the film thickness. We attribute this result to the excitation of a two-magnons mode on the NiO by an acoustic mode generated in nickel
Spenato, David. "Dynamique de l'aimantation et distribution de l'anisotropie magnétique dans les couches minces ferromagnétiques douces amorphes : modélisation et étude expérimentale". Brest, 1994. http://www.theses.fr/1994BRES2025.
El, Mrabti Halim. "Dynamique de l’aimantation des nanoparticules magnétiques en présence d’un champ magnétique alternatif". Perpignan, 2012. http://www.theses.fr/2012PERP1082.
In the present work, the dynamics of the magnetization of single domain magnetic nanoparticles assisted by an external alternative current (ac) magnetic field of arbitrary strength and orientation, in presence of the thermal agitation, is treated in the context of the Brown’s model of coherent rotation of the magnetization. Our main objective was to treat nonlinear effects due to strong ac magnetic excitations in the dynamics of the magnetization of an individual nanoparticle and an assembly of non-interacting nanoparticles across a wide frequency range (up to 10 GHz). Our study has been focused on the nanoparticles both with a uniaxial and biaxial anisotropy. We have calculated the relevant physical quantities such as nonlinear dynamical susceptibility, magnetization reversal time, and dynamic magnetic hysteresis (DMH). The results show a strong dependence of nonlinear response and the DMH on the anisotropy constant, biaxiality constant, temperature, amplitudes and orientations of the dc and ac fields. Furthermore, in contrast to uniaxial particles, the nonlinear ac stationary response and DMH strongly depend on the azimuthal direction of the ac field and not only the polar angle between the easy axis and the external field vector. In the present work, we have developed a theoretical approach to treat the dynamics of the magnetization of the magnetic nanoparticles subjected to a strong ac field, opening a new way to the solution of other nonlinear problems