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We report a spin valve with a few-layer graphene flake bridging highly spin-polarized La0.67Sr0.33MnO₃ electrodes, whose surfaces are kept clean during lithographic definition. Sharp magnetic switching is verified using photoemission electron microscopy with x-ray magnetic circular dichroism contrast. A naturally occurring high interfacial resistance ~12 MΩ facilitates spin injection, and a large resistive switching (0.8 MΩ at 10 K) implies a 70--130 μm spin diffusion length that exceeds previous values obtained with sharp-switching electrodes.
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Yan et al. (2016) studied this question.
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