Spin-induced band modifications of graphene through intercalation of magnetic iron atoms
SCIE
SCOPUS
- Title
- Spin-induced band modifications of graphene through intercalation of magnetic iron atoms
- Authors
- Sijin Sung; Jaewon Yang; Pangro Lee; Jingul Kim; Mintae Min; Heemin Park; Gensik Lee; Chankuk Hwang; Kwang S Kim; Jaesam Kim; Chung, JW
- Date Issued
- 2014-01
- Publisher
- RSC
- 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 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/11757
- DOI
- 10.1039/C3NR04178F
- ISSN
- 2040-3364
- Article Type
- Article
- Citation
- nanoscale, vol. 6, no. 7, page. 3824 - 3829, 2014-01
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