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Des interfaces reelles metal/MgO(001) au transport dans les jonctions tunnel epitaxiees

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). 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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Contributor : Muriel Sicot <>
Submitted on : Monday, January 2, 2006 - 8:23:50 PM
Last modification on : Thursday, December 17, 2020 - 11:26:06 AM
Long-term archiving on: : Friday, September 14, 2012 - 4:25:14 PM


  • HAL Id : tel-00011206, version 1



Muriel Sicot. Des interfaces reelles metal/MgO(001) au transport dans les jonctions tunnel epitaxiees. Physique [physics]. Université Henri Poincaré - Nancy I, 2005. Français. ⟨tel-00011206⟩



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