Vers une électronique de spin cohérente de phase à base de nanotubes de carbone

Abstract : The scattering imbalance between up and down spins at the interface between a non- magnetic metal and a ferromagnetic metal is at the heart of the principle of the magnetic tunnel junctions or multilayers celebrated in the ¯eld of spintronics. Although these devices use the quantum mechanical spin degree of freedom and electron tunneling, they do not ex- ploit a crucial degree of freedom involved in quantum mechanics : the phase of the electronic wave function. In most of the devices studied so far, this aspect has not been developed owing to the classical-like motion of charge carriers in the conductors used. In this work, we report on spin dependent transport measurements in carbon nanotubes based multi-terminal circuits. We observe a gate-controlled spin signal in non-local voltages and an anomalous conductance spin signal, which reveal that both the orbital phase and the spin can be conserved along carbon nanotubes with multiple ferromagnetic contacts. We also report on an intriguing phe- nomenon which has no classical analog and is a consequence of orbital coherence : a spin valve behavior between two normal contacts with proximal ferromagnetic contacts outside the clas- sical electron path. This realizes a "theorist blob experiment" for spintronics. These ¯ndings pave the way for spintronics devices exploiting both these quantum mechanical degrees of freedom on the same footing.
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Submitted on : Friday, October 22, 2010 - 10:06:01 PM
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  • HAL Id : tel-00528939, version 1

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Chéryl Feuillet-Palma. Vers une électronique de spin cohérente de phase à base de nanotubes de carbone. Matière Condensée [cond-mat]. Université Pierre et Marie Curie - Paris VI, 2010. Français. ⟨tel-00528939⟩

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