The ability to manipulate electronic spin in organic molecular materials offers a new and promising way towards spin electronics, both from fundamental and technological points of view. This is mainly due to the unquestionable advantage of weak spin-orbit and hyperfine coupling in organic molecules, leading to the possibility of preserving spin-coherence over times and distances much longer than in conventional metals or semiconductors. The search of new materials suitable for injecting and transferring carriers with a preferential spin orientation is very important for the development of spintronics. We have prepared spin-valve devices with half-metallic La0.67Sr0.33MnO3 (LSMO) and Co as the two ferromagnetic electrodes and an organic polymer poly(3-hexylthiophene) (P3HT) as the spacer material. The devices exhibit significant changes in resistance as the angle between the magnetic moments in the two electrodes is varied, demonstrating that electrons can traverse the molecular barrier while remaining spin polarized, even at higher temperatures. We have also observed a strong bias and temperature dependence of the magnetoresistance suggesting that spin polarized transport is hindered by localized states in the molecular barrier.

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