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Utilisation de semi-conducteurs organiques comme barrière tunnel pour l'électronique de spin

Abstract : This thesis concerns the fabrication of organic magnetics tunnel junctions. Organic MTJs replace the barrier with a molecule. First, we had to overcome the problems of MTJ manufacturing. Indeed, this type of junction is very fragile from the point of view of its manufacturing because they are incompatible with solvents. A new manufacturing process has been developed. This process uses small nanometric "beads" scattered on the surface of a sample. This method has been used successfully and we obtained a magnetic response of the samples. XAS and magneto-transport measurements were conducted on MgO junctions. An innovative in operando approach was used. These measurements revealed that the presence of oxide at the interfaces limits the TMR. Finally, SR-PES measurements were carried out in order to study the Cu/MnPc interface polarization in the Cu (100)//Co/Cu/MnPc system. These measurements revealed that this interface is strongly spin polarized. Structures appearing in the spectra cannot be explained by a simple attenuation of the cobalt signal due to molecule coverage.
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Etienne Urbain. Utilisation de semi-conducteurs organiques comme barrière tunnel pour l'électronique de spin. Matière Condensée [cond-mat]. Université de Strasbourg, 2017. Français. ⟨NNT : 2017STRAE048⟩. ⟨tel-01820725⟩

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