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<dc:title xml:lang="fr">Utilisation de semi-conducteurs organiques comme barrière tunnel pour l'électronique de spin</dc:title>
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<dc:subject xml:lang="fr">Spintronique organique</dc:subject>
<dc:subject xml:lang="fr">Jonctions tunnel magnétiques</dc:subject>
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<dc:subject xml:lang="fr">Synchrotron</dc:subject>
<dc:subject xml:lang="fr">Phthalocyanine</dc:subject>
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<dc:subject xml:lang="fr">Transport</dc:subject>
<dc:subject xml:lang="fr">Spinterface</dc:subject>
<dc:subject xml:lang="en">Organic spintronics</dc:subject>
<dc:subject xml:lang="en">Magnetic tunnel junctions</dc:subject>
<dc:subject xml:lang="en">Manufacturing process</dc:subject>
<dc:subject xml:lang="en">Synchrotron</dc:subject>
<dc:subject xml:lang="en">Phthalocyanine</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette thèse s’intéresse à la fabrication de jonctions magnétiques à effet tunnel organiques. Les MTJ organiques remplacent la barrière par une molécule. Il a fallu d’abord vaincre les problèmes liés à la fabrication de ces MTJ. En effet, ce type de jonction est très fragile du point de vue de sa fabrication, car incompatible avec les solvants. Un nouveau procédé de fabrication a été mis au point. Ce procédé fait appel à de petites « billes » nanométriques dispersées à la surface d’un échantillon. Ce procédé a été utilisé avec succès. Nous avons obtenu une réponse magnétique des échantillons. Des mesures XAS et de magnéto-transport ont été menées sur des jonctions MgO. Une approche in operando innovante a été utilisée. Ces mesures ont démontré que la présence d’oxyde de fer aux interfaces limite la TMR. Pour finir, des mesures SR-PES ont été menées dans le but d’étudier la polarisation d’interface de Cu/MnPc dans le système Cu(100)//Co/Cu/MnPc. Ces mesures ont révélé que cette interface est très fortement polarisée en spin. Les structures qui apparaissent dans les spectres ne peuvent être expliquées par une simple atténuation du signal du cobalt due à la couverture de molécules.</dcterms:abstract>
<dcterms:abstract xml:lang="en">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.</dcterms:abstract>
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