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  • Title: Spin-induced band modifications of graphene through intercalation of magnetic iron atoms.
    Author: Sung SJ, Yang JW, Lee PR, Kim JG, Ryu MT, Park HM, Lee G, Hwang CC, Kim KS, Kim JS, Chung JW.
    Journal: Nanoscale; 2014 Apr 07; 6(7):3824-9. PubMed ID: 24584481.
    Abstract:
    Intercalation of magnetic iron atoms through graphene formed on the SiC(0001) surface is found to induce significant changes in the electronic properties of graphene due mainly to the Fe-induced asymmetries in charge as well as spin distribution. From our synchrotron-based photoelectron spectroscopy data together with ab initio calculations, we observe that the Fe-induced charge asymmetry results in the formation of a quasi-free-standing bilayer graphene while the spin asymmetry drives multiple spin-split bands. We find that Fe adatoms are best intercalated upon annealing at 600 °C, exhibiting split linear π-bands, characteristic of a bilayer graphene, but much diffused. Subsequent changes in the C 1s, Si 2p, and Fe 3p core levels are consistently described in terms of Fe-intercalation. Our calculations together with a spin-dependent tight binding model ascribe the diffuse nature of the π-bands to the multiple spin-split bands originated from the spin-injected carbon atoms residing only in the lower graphene layer.
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