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In graphene spintronics, interaction of localized magnetic moments with theelectron spins paves a new way to explore the underlying spin relaxationmechanism. A self-assembled layer of organic cobalt-porphyrin (CoPP) moleculeson graphene provides a desired platform for such studies via the magneticmoments of porphyrin-bound cobalt atoms. In this work a study of spin transportproperties of graphene spin-valve devices functionalized with such CoPPmolecules as a function of temperature via non-local spin-valve and Hanle spinprecession measurements is reported. For the functionalized (molecular)devices, we observe a slight decrease in the spin relaxation time ({\tau}s),which could be an indication of enhanced spin-flip scattering of the electronspins in graphene in the presence of the molecular magnetic moments. The effectof the molecular layer is masked for low quality samples (low mobility),possibly due to dominance of Elliot-Yafet (EY) type spin relaxation mechanisms.

Spin Relaxation in Graphene with self-assembled Cobalt Porphyrin Molecules