Abstract
We report on the demonstration of ferromagnetic spin injectors for spintronics which are protected against oxidation through passivation by a single layer of graphene. The graphene monolayer is directly grown by catalytic chemical vapor deposition on pre-patterned 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.
Highlights
We report on the demonstration of ferromagnetic spin injectors for spintronics which are protected against oxidation through passivation by a single layer of graphene
For spintronics and in the case of multilayer chemical vapor deposition (CVD) graphene on nickel, functional spin valves devices based on multilayer graphene protected ferromagnetic electrodes (GPFE) have demonstrated the feasibility of this approach
We show that a single layer of graphene, derived by a direct CVD step with low enough temperatures (450 C) to be compatible with complementary metal-oxide-semiconductor (CMOS) processes,18,19 is sufficient to protect the surface of a nickel electrode against oxidation and maintain a spin polarization
Summary
We report on the demonstration of ferromagnetic spin injectors for spintronics which are protected against oxidation through passivation by a single layer of graphene. Protecting nickel with graphene spin-filtering membranes: A single layer is enough
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