Graphene spin capacitor for magnetic field sensing

Details Graphene spin capacitor for magnetic field sensing Graphene spin capacitor for magnetic field sensing

2010-05-13

arxiv.org/abs/1005.2423v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 3 figures

Scientific paper

An analysis of a novel magnetic field sensor based on a graphene spin capacitor is presented. The proposed device consists of graphene nanoribbons on top of an insulator material connected to a ferromagnetic source/drain. The time evolution of spin polarized electrons injected into the capacitor can be used for an accurate determination at room temperature of external magnetic fields. Assuming a spin relaxation time of 100 ns, magnetic fields on the order of $\sim 10$ mOe may be detected at room temperature. The observational accuracy of this device depends on the density of magnetic defects and spin relaxation time that can be achieved.

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