Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: TR: Nanoelectronics II: Spintronics and Magnetotransport
TT 6.5: Vortrag
Montag, 22. März 2010, 15:00–15:15, H19
Orbitally phase coherent spintronics — Cheryl Feuillet-Palma1,2, Thomas Delattre1,2, Pascal Morfin1,2, Jean-Marc Berroir1,2, Gwendal Feve1,2, Christian Glattli1,2,3, Bernard Placais1,2, Audrey Cottet1,2, and •Takis Kontos1,2 — 1Laboratoire Pierre Aigrain, Ecole Normale Supérieure, 24, rue Lhomond, 75231 Paris Cedex 05, France — 2CNRS UMR 8551, Laboratoire associé aux universités Pierre et Marie Curie et Denis Diderot, France — 3Service de physique de l’état Condensé, CEA, 91192
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 field of spintronics. Although these devices use the quantum mechanical spin degree of freedom and electron tunneling, they do not exploit 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. This paves the way for spintronics devices exploiting both these quantum mechanical degrees of freedom on the same footing.