Gate-tunable graphene spin valve

Sungjae Cho, Yung Fu Chen, Michael S. Fuhrer

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The authors perform nonlocal four-probe spin-valve experiments on graphene contacted by ferromagnetic Permalloy electrodes. They observe sharp switching and often sign reversal of the nonlocal resistance at the coercive field of the electrodes, indicating the presence of a spin current between injector and detector. The nonlocal spin-valve signal changes magnitude and sign with back-gate voltage, and is observed up to T=300 K. The gate voltage variation of the spin-valve signal may result from quantum-coherent transport, as evidenced by Fabry-Ṕrot-like oscillations of the current.

Original languageEnglish
Article number123105
JournalApplied Physics Letters
Issue number12
Publication statusPublished - 28 Sep 2007
Externally publishedYes

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