Synthèse et caractérisation d’agrégats bimétalliques pour la magnéto-plasmonique

Abstract : For several years condensed matter physicists have been interested in the optical and magnetic properties of metallic nanoparticles. Two properties remain largely studied: localized plasmon resonances and magnetic anisotropy at the nanoscale. These two effects resulting from very different electronic properties which are usually encountered in separate nanosystems. Since the 2000's, studies have shown that it is possible to benefit from these two characteristics in a single nanometric system. In this thesis, we will focus on the combination of magnetic and plasmonic properties in systems of size less than ten nanometers: bimetallic clusters of CoAg and CoAu synthesized physically under ultrahigh vacuum and embedded in a matrix (alumina and carbon). We will study the structure of these bimetallic clusters of different stoichiometries and the effect of their environment through the investigation of their optical, magnetic and electronic properties (by electron energy loss spectroscopy (EELS) on individual particles ). We will show the effect of the matrix, carbon or alumina, on the structure of the clusters as well as on their magnetic properties (moment by cluster, anisotropy). In optics we will also see the importance of stoichiometry between noble metal and cobalt on the phenomena of the damping and shifting of the plasmon resonance. Finally we will show the spatial distribution of surface plasmons on single particles by STEM-EELS measurements
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Optique [physics.optics]. Université de Lyon, 2018. Français. 〈NNT : 2018LYSE1033〉
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Ophelliam Loiselet. Synthèse et caractérisation d’agrégats bimétalliques pour la magnéto-plasmonique. Optique [physics.optics]. Université de Lyon, 2018. Français. 〈NNT : 2018LYSE1033〉. 〈tel-01813117〉



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