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Des interfaces réelles métal/MgO(001) au transport dans les jonctions tunnel épitaxiées

Abstract : The quality of ferromagnetic metal/oxide interfaces and its influence on spin dependent tunneling processes are studied in this thesis. The work was dedicated to ultrathin bilayers NiMnSb/MgO(001), Fe/ MgO(001), Co/ MgO(001) and Mn/ MgO(001) elaborated by Molecular Beam Epitaxy. The originality of this work lies on the study of the electronic properties of the magnetic material in contact with the oxide (interfacial hybridization, polarization, and magnetism, using regular characterization means as well as synchrotron radiation sources). Fe/MgO and Co/MgO are shown to be model interfaces from the growth and the chemical point of view. On the contrary, Mn is oxidized when it is in contact with MgO. In addition, tunnel magnetoresistance are probed in totally magnetic tunnel junctions Fe/MgO/Fe(001). Transport measurements evidence spin filtering effects due to the MgO barrier depending on the symmetry of the Bloch waves. Moreover, we show that the structural quality of the bottom Fe/MgO interface and of the Fe electrode have non negligeable influence on these spin dependent mechanisms.
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Submitted on : Thursday, March 29, 2018 - 10:42:22 AM
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  • HAL Id : tel-01746668, version 1



Muriel Sicot. Des interfaces réelles métal/MgO(001) au transport dans les jonctions tunnel épitaxiées. Autre. Université Henri Poincaré - Nancy 1, 2005. Français. ⟨NNT : 2005NAN10138⟩. ⟨tel-01746668⟩



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