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MA: Fachverband Magnetismus
MA 54: Spin: Transport, Orbitronics and Hall Effects II
MA 54.1: Vortrag
Donnerstag, 19. März 2020, 15:00–15:15, HSZ 403
Temperature dependence of the Spin-Charge Conversion in Highly-doped π-conjugated Polymer PBTTT — •Mohammad Qaid1, Olga Zadvorna2, Henning Sirringhaus2, and Georg Schmidt1 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 3, 06120 Halle — 2Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
We present an intensive study addressing the temperature dependence of the spin-to-charge conversion in highly doped π-conjugated polymer PBTTT. The polymer is deposited on a ferrimagnetic YIG thin film and doped with F4TCNQ [1]. In ferromagnetic resonance a spin current is injected from the YIG into the PBTTT and the ISH-voltage is measured in the organic semiconductor. We have performed an ISHE thickness-dependence study at low temperatures which provides insight into the spin relaxation mechanisms in PBTTT. This study enabled us to extract some of the key parameters of the spin relaxation in highly-doped PBTTT, namely spin diffusion length and spin relaxation time. Our results indicate that the spin relaxation in PBTTT can be explained by Elliot-Yafet mechanism. Besides that, the change of the spin life-time with temperature indicates that the spin is more likely conserved in the hopping events and the spin flip occurs at the thermally reduced trapping events.
References [1]- Wang, Shu-Jen, et al, Nature Electronics 2, 98-107(2019)