Transmission d'électrons chauds, polarisés de spin, dans des jonctions Schottky métal ferromagnétique / semi-conducteur

Nicolas Rougemaille 1
1 EPS
LPMC - Laboratoire de physique de la matière condensée
Abstract : The aim of this work is to study the spin-dependent transport phenomena which occur when high energy and spin-polarized electrons are injected from vacuum into Pd / Fe / GaAs Schottky junctions. The experiment we carried out consists in measuring, as a function of the injection energy, the transmitted current intensity after the electron beam passed through the magnetic layer and the Schottky barrier. For injection energies ranging between a few eV and 1 keV above the Fermi level, we highlighted completely unexpected effects. On the one hand, the transmission, which is 10^(-5) approximately at low injection energy, increases over more than 5 orders of magnitude for 1 keV electrons. Then, the intensity of the current collected in the semiconductor is higher than the intensity of the current injected from vacuum. In addition, the spin dependent component of the transmission increases over 4 orders of magnitude in the probed energy range.
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Nicolas Rougemaille. Transmission d'électrons chauds, polarisés de spin, dans des jonctions Schottky métal ferromagnétique / semi-conducteur. Matière Condensée [cond-mat]. Ecole Polytechnique X, 2003. Français. ⟨tel-00188153⟩

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