Spin relaxation in graphene with self-assembled cobalt porphyrin molecules

Ivan Vera Marun, S Omar, M Gurram, X Zhang, E H Huisman, A Kaverzin, B L Feringa, B J van Wees

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    In graphene spintronics, interaction of localized magnetic moments with the electron spins paves a new way to explore the underlying spin-relaxation mechanism. A self-assembled layer of organic cobalt porphyrin (CoPP) molecules on graphene provides a desired platform for such studies via the magnetic moments of porphyrin-bound cobalt atoms. In this work a study of spin-transport properties of graphene spin-valve devices functionalized with such CoPP molecules as a function of temperature via nonlocal spin-valve and Hanle spin-precession measurements is reported. For the functionalized (molecular) devices, we observe a decrease in the spin-relaxation time ??s even up to 50\%, which could be an indication of enhanced spin-flip scattering of the electron spins in graphene in the presence of the molecular magnetic moments. The effect of the molecular layer is masked for low-quality samples (low mobility), possibly due to dominance of Elliot-Yafet-type spin relaxation mechanisms.
    Original languageEnglish
    JournalPhysical Review B
    Issue number11
    Publication statusPublished - Sept 2015


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