Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-06-11
J. Appl. Phys. 108, 033709 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 5 figures
Scientific paper
10.1063/1.3457353
The electronic properties of armchair graphene nanoribbons (AGNRs) can be significantly modified from semiconducting to metallic states, by applying a uniform perpendicular magnetic field (B-field). Here, we theoretically study the bandgap modulation induced by a perpendicular B-field. The applied B-field causes the lowest conduction subband and the top-most valence subband to move closer to one another to form the n=0 Landau level. We exploit this effect to realize a device relevant MR modulation. Unlike in conventional spin-valves, this intrinsic MR effect is realized without the use of any ferromagnetic leads. The AGNRs with number of dimers, Na=3p+1 [p=1,2,3,...] show the most promising behavior for MR applications, with large conductance modulation and hence, high MR ratio at the optimal source-drain bias. However, the MR is suppressed at higher temperature due to the spread of the Fermi function distribution. We also investigate the importance of the source-drain bias in optimizing the MR. Lastly, we show that edge roughness of AGNRs has the unexpected effect of improving the magnetic sensitivity of the device and thus increasing the MR ratio.
Jalil Mansoor B. A.
Kumar Sathish B.
Liang Gengchiau
Tan Seng Ghee
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