engleski

Modifying the proximity induced spin polarization of graphene by the electric field

We study the spin polarization that is induced in graphene when it is placed on top of a cobalt slab passivated by a layer of gold or platinum atoms by density functional theory. We are interested in possibility of changing the said spin polarization, especially at the ermi level, by applying the electric field to system. This would be interesting in spintronics for design of spin valves and logic gates. It was shown that the passivation of the slab is necessary to prevent the formation of chemical bond between it and graphene, which prevents the electric field to change the spin polarization of graphene [1]. However, even though the previous work established that the electric field could change the spin polarization when the slab is passivated by graphene or hexagonal boron nitride, a device that would be based on this junction would be inefficient, because the doping of graphene on structure formation prevents small fields to make significant changes to spin polarization of graphene. Therefore, we look for passivation layers that would also compensate for the unwanted charge transfer and make the proposed device efficient. We show not only that the passivation of the cobalt slab by monolayer of gold or platinum atoms can reduce the charge transfer, therefore improving efficiency of the proposed device, but also that interesting magnetic patterns are induced into graphene.

magnetism ; surfaces ; 2D materials

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