Transport tunnel polarisé en spin dans le système épitaxié Fe/MgO/Fe :interactions magnétiques et symétries électroniques

Abstract : Monocrystalline Fe(1 00)/MgO(1 00)/Fe(1 00) magnetic tunnel junctions (MT J), elaborated by Molecular Beam Epitaxy constitute ideal systems for validation of specific concepts related to the spin polarized transport in crystalline multilayers. The analysis of the band structure shows that the Fe(100) behaves as a half-metal with respect to the 01 electronic symmetry; this new concept of spin polarization/filtering in terms of symmetry being at the origin of huge magnetoresistive effects theoretically predicted in these systems. Our magnetotransport results validate the effects of electronic symmetry filtering. Moreover, they illustrate the influence of the electronic structure on tunnel transport, whose complex mechanisms go weil beyond the free- electron framework. The precise control of the bidimensional epitaxial growth of MgO allowed us the elaboration of extremely thin insulating barriers for which we provide a first experimental proof of magnetic coupling by spin polarized tunneling.
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Jérôme Faure-Vincent. Transport tunnel polarisé en spin dans le système épitaxié Fe/MgO/Fe :interactions magnétiques et symétries électroniques. Autre [cond-mat.other]. Institut National Polytechnique de Lorraine, 2005. Français. ⟨NNT : 2004INPL092N⟩. ⟨tel-01749686⟩

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