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Understanding spin physics in graphene is crucial for developing futuretwo-dimensional spintronic devices. Recent studies show that efficientspin-to-charge conversions via either the inverse spin Hall effect or theinverse Rashba-Edelstein effect can be achieved in graphene by proximity withan adjacent spin-orbit coupling material. Lateral spin valve devices, made upof a graphene Hall bar and ferromagnets, are best suited for such studies.Here, we report that signals mimicking the inverse Rashba-Edelstein effect canbe measured in pristine graphene possessing negligible spin-orbit coupling,confirming that these signals are unrelated to spin-to-charge conversion. Weidentify either the anomalous Hall effect in the ferromagnet or the ordinaryHall effect in graphene induced by stray fields as the possible sources of thisartefact. By quantitatively comparing these options with finite-element-methodsimulations, we conclude the latter better explains our results. Our studydeepens the understanding of spin-to-charge conversion measurement schemes ingraphene, which should be taken into account when designing future experiments.

Reliability of spin-to-charge conversion measurements in graphene-based lateral spin valves