Spin-induced band modifications of graphene through intercalation of magnetic iron atoms
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- Spin-induced band modifications of graphene through intercalation of magnetic iron atoms
- Sung, S. J.; Yang, J. W.; Lee, P. R.; Kim, J. G.; Ryu, M. T.; Park, H. M.; Lee, Geunsik; Hwang, C. C.; Kim, Kwang S.; Kim, J. S.; Chung, J. W.
- EPITAXIAL GRAPHENE; FILMS
- Issue Date
- ROYAL SOC CHEMISTRY
- NANOSCALE, v.6, no.7, pp.3824 - 3829
- 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 degrees C, exhibiting split linear p-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 pi-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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