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Journal Article

Protecting nickel with graphene spin-filtering membranes: A single layer is enough


Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Martin, M.-B., Dlubak, B., Weatherup, R. S., Piquemal, M., Yang, H., Blume, R., et al. (2015). Protecting nickel with graphene spin-filtering membranes: A single layer is enough. Applied Physics Letters, 107(1): 012408. doi:10.1063/1.4923401.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-D502-A
We report on the demonstration of ferromagnetic spin injectors for spintronics which are protected against oxidation through the passivation by a single layer of graphene. The graphene monolayer is directly grown by catalytic chemical vapor deposition on prepatterned nickel electrodes. X-ray photoelectron spectroscopy reveals that even with its monoatomic thickness, monolayer graphene still efficiently protects spin sources against oxidation in ambient air. The resulting single layer passivated electrodes are integrated into spin valves and demonstrated to act as spin polarizers. Strikingly, the atom-thick graphene layer is shown to be sufficient to induce a characteristic spin filtering effect evidenced through the sign reversal of the measured magnetoresistance.