Graphene spin capacitor for magnetic field sensing

Preprint English OPEN
Semenov, Y. G. ; Zavada, J. M. ; Kim, K. W. (2010)
  • Related identifiers: doi: 10.1063/1.3462297
  • Subject: Condensed Matter - Mesoscale and Nanoscale Physics | Condensed Matter - Other Condensed Matter
    arxiv: Condensed Matter::Strongly Correlated Electrons

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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