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<dc:title xml:lang="en">Role of surfaces in magnetization dynamics and spin polarized transport : a spin wave study</dc:title>
<dcterms:alternative xml:lang="fr">Rôle des surfaces dans la dynamique d'aimantation et le transport polarisé en spin : une étude d'ondes de spin</dcterms:alternative>
<dc:subject xml:lang="fr">Transport polarisé en spin</dc:subject>
<dc:subject xml:lang="fr">Diffusion des électrons par les surfaces</dc:subject>
<dc:subject xml:lang="fr">Dynamique de spin</dc:subject>
<dc:subject xml:lang="fr">Ondes de spin</dc:subject>
<dc:subject xml:lang="en">Spin polarized transport</dc:subject>
<dc:subject xml:lang="en">Surface electron scattering</dc:subject>
<dc:subject xml:lang="en">Spin dynamics</dc:subject>
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<tef:elementdEntree autoriteExterne="027884724" autoriteSource="Sudoc">Aimantation</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="029698650" autoriteSource="Sudoc">Dispositifs à couches minces</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Dans cette thèse, nous proposons d’explorer la relation entre transport électronique et dynamique d’aimantation afin de mieux comprendre certaines propriétés des films minces de métaux ferromagnétiques. Afin d’extraire l’influencede la diffusion des électrons par les surfaces sur les résistivités dépendantes du spin, des séries d’épaisseur de films de permalloy (Ni80Fe20) ont été déposées et étudiées. En plus de mesures électriques et magnétiques conventionnelles,nous avons réalisé une étude détaillée de la propagation des ondes de spin dans ces films. La technique du décalage Doppler d’ondes de spin induit par un courant électrique a été utilisée pour extraire le degré de polarisation en spin du courant électrique. Nous avons observé que ce degré de polarisation décroît lorsque l’épaisseur du film décroît, ce qui suggère que les surfaces contribuent aux résistivités dépendantes du spin et qu’elles ont tendance à dépolariser le courant électrique.</dcterms:abstract>
<dcterms:abstract xml:lang="en">In this thesis, the interplay between electron transport and magnetization dynamics is explored in order to access to fundamental properties of ferromag- netic metal thin films. With the aim of extracting the influence of the electron surface scattering on the spin-dependent resistivities, thickness series of permal-loy (Ni80Fe20) films were grown and studied. In addition to standard electrical and magnetic measurements, a detailed study of the propagation of spin waves along these films was performed. Resorting to the current-induced spin-wave Doppler shift technique, the degree of spin-polarization of the electrical current was extracted. This degree of spin-polarization was found to decrease when the film thickness decreases, which suggests that the film surfaces contribute to the spin dependent resistivities and tend to depolarize the electrical current.</dcterms:abstract>
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