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    演　題 「Organic Spin Battery and Spin-to-Charge Converter」
    日　時 2012年12月11日(火) 11:00 より 12:00 まで
    講演者 Dr. Shun Watanabe （University of Cambridge）
    場　所

    分子科学研究所　研究棟302
    概　要

    Spintronic applications based on organic semiconductors (OSCs) have been widely investigated because of not only their ease, large-area, and solution processability but also their exceptionally long spin lifetimes due to their light elemental compositions. Traditional studies have focused on discovering magnetoresistance using multilayer structure, like organic spin valves, where spin polarized current is injected and transport through OSCs. Unlike a spin polarized current, a pure spin current is a flow of electrons’ angular momentum without a simultaneous flow of one’s charges. Since carrier spins mainly play a key role in transmitting, processing and storing information, in such devices a current dissipation and device degradation due to Joule heating could be potentially overcome.
    However, to exploit this potential, a method for direct conversion of spin information into an electric signal is indispensable. Here we demonstrate the spin-to-charge conversion in a solution-processed conducting polymer, PEDOT:PSS. We show that the pure spin current can be produced by pumping of spins through exciting ferromagnetic resonance in an adjacent magnetic insulator, Yttrium Iron Garnet, and that this pure spin current generates an electric voltage across the polymer film. All experimental characteristics of the generated voltage are fully consistent with it being generated by the inverse spin Hall effect in the conducting polymer. In contrast to inorganic materials, the conducting polymer displays coexistence of high spin-current to charge-current conversion efficiency and long spin lifetime. The latter, over-10-microseconds spin lifetime, could enhance the spin accumulation at the interface, as predicted by spin Battery theory. Our discovery not only provides a basis for studying the process of spin-to-charge conversion in organic materials, but also opens a route for a new generation of molecular-structure-engineered spintronic devices, that could lead to important advances in plastic spintronics.
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