Graphite and Graphene as Perfect Spin Filters


Karpan, V.M. and Giovannetti, G. and Khomyakov, P.A. and Talanana, M. and Starikov, A.A. and Zwierzycki, M. and Brink, J. van den and Brocks, G. and Kelly, P.J. (2007) Graphite and Graphene as Perfect Spin Filters. Physical Review Letters, 99 (17). p. 176602. ISSN 0031-9007

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Abstract:Based upon the observations (i) that their in-plane lattice constants match almost perfectly and (ii) that their electronic structures overlap in reciprocal space for one spin direction only, we predict perfect spin filtering for interfaces between graphite and (111) fcc or (0001) hcp Ni or Co. The spin filtering is quite insensitive to roughness and disorder. The formation of a chemical bond between graphite and the open d-shell transition metals that might complicate or even prevent spin injection into a single graphene sheet can be simply prevented by dusting Ni or Co with one or a few monolayers of Cu while still preserving the ideal spin-injection property.
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Copyright:© 2007 American Physical Society
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