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Role of surfaces in magnetization dynamics and spin polarized transport : a spin wave study

Abstract : 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.
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Mohammad Haidar. Role of surfaces in magnetization dynamics and spin polarized transport : a spin wave study. Other [cond-mat.other]. Université de Strasbourg, 2012. English. ⟨NNT : 2012STRAE039⟩. ⟨tel-00869643⟩

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