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Les jonctions tunnels magnétiques épitaxiées à base de MgO(001) : de l'étude statique et dynamique à l'injection de spin dépendant des symétries.

Abstract : The symmetry-filtering into the ferromagnets as predicted by the theoreticians has never suffered of any other justification than its ability to shed the light on the experimental observations. Fe/MgO/Fe(001) junctions are then an appropriate tool to test its validity thanks to their high crystallinity. The first performed low frequency noise measurements have proved the well-suited quality of this kind of junctions and the study of the current's dynamic through the system, its pure direct tunneling. By using Cr(001) thin films, the symmetry-filtering has been unambiguously highlighted with the occurrence of quantum-well states only for one specific electronic symmetry in Fe/Cr/Fe/MgO/Fe(001). Thus, the validity of the theoretical concepts allows investigating the symmetry-dependent spin-injection into more complex systems such as Fe3O4(001) thin films which have revealed theirselves as promising to integrate into MgO(001)-based tunnel devices.
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Submitted on : Sunday, August 23, 2009 - 2:41:25 AM
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  • HAL Id : tel-01748542, version 2

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Fanny Greullet. Les jonctions tunnels magnétiques épitaxiées à base de MgO(001) : de l'étude statique et dynamique à l'injection de spin dépendant des symétries.. Matière Condensée [cond-mat]. Université Henri Poincaré - Nancy 1, 2009. Français. ⟨NNT : 2009NAN10001⟩. ⟨tel-01748542v2⟩

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