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Effet de la symétrie des lacunes d'oxigène dans MgO sur le transport électronique polarisé en spin

Abstract : In sprintronics, the study of multilayer heterostructures composed of a ferromagnetic electrodes and a thin insulating layer, i.e. magnetic tunnel junctions (MTJs), is of special importance. The canonical systems are MTJs made of Fe/MgO/Fe where hight tunneling mangetoresistance ratio (TMR) values were measured. The crucial factor defining the junction performance is the structural imperfection appearing in a real devices. In our work we focused in particular on oxygen vacancies in MgO. By means of density functional theory we studied ground state electronic properties of single and double oxygen vacancies, referred as F and M centers, respectively, in bulk MgO. We then switched to full junctions where we investigated the impact of vacancies on the ballistic transport. We demonstrated that M centers played a superior role and proved that coherent transport, preserving electrons spin and symmetry, is possible in presence of paired vacancies.
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Beata Taudul. Effet de la symétrie des lacunes d'oxigène dans MgO sur le transport électronique polarisé en spin. Physique [physics]. Université de Strasbourg, 2017. Français. ⟨NNT : 2017STRAE042⟩. ⟨tel-01820642⟩

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