Adsorption-induced magnetic properties and metallic behavior of graphene

Zhou, Y. G.; Zu, X. T.; Gao, F.; Lv, H. F.; Xiao, H. Y.
September 2009
Applied Physics Letters;9/21/2009, Vol. 95 Issue 12, p123119
Academic Journal
Magnetic properties and electronic structures of graphene with Cl, S, and P adsorption have been investigated using ab initio calculations. The adsorption of Cl leads to Fermi level shifting to valence band, which results in metallic graphene. A band gap of 0.6 eV emerges in a S-absorbed graphene, leading to the semiconducting graphene. The unpaired electrons in the absorbed P atom are polarized and thus exhibit a magnetic moment of 0.86μB, while no magnetic moment has been observed after Cl and S adsorption. This demonstrates that the magnetic properties and conductive behavior of graphene can be modified via atom adsorption. Specially, P-absorbed graphene may be useful for spintronic applications, such as tunneling magnetoresistance.


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