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Transport dépendant du spin dans des monocouches auto-assemblées π-conjuguées

Abstract : The topic of this PhD Thesis is the spin-dependent transport in π-conjugated self-assembled monolayers (SAMs), through the design of magnetic tunnel junction in which the tunnel barrier is made of a SAM of oligophenyl-dithiols. The goal is to study how the introduction of aromatic moieties in the tunnel barriers impacts the transport and the magnetoresistance signals of the junctions.In this work will be firstly introduced the methods to recover an oxidized ferromagnetic surface, to functionalize it with a SAM of oligophenyl-dithiols, and to successfully integrate this interface within a spintronics device made of two ferromagnetic elecrodes.Afterwards the transport characterization of the devices will be presented, aiming to identify the electronic properties of the oligophenyl tunnel barrier. This will be followed by a full study of the magnetoresistive signals in the devices.Lastly, we will discuss the integration of photoactive molecules, paving the way to the making of multifunctional devices in which the resistance can be controlled both by a magnetic field and an external energy source such as light.
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Submitted on : Thursday, July 23, 2020 - 5:30:12 PM
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Benoît Quinard. Transport dépendant du spin dans des monocouches auto-assemblées π-conjuguées. Science des matériaux [cond-mat.mtrl-sci]. Université Paris-Saclay, 2020. Français. ⟨NNT : 2020UPASS015⟩. ⟨tel-02905820⟩

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