Journal
PHYSICAL REVIEW B
Volume 78, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.195420
Keywords
carbon; density functional theory; doping; magnetic anisotropy; magnetic moments; magnetic transitions; magnetoelectronics; nanostructured materials; nickel
Funding
- Basque Government
- UPV/EHU [IT-366-07]
- CSIC
- Spanish MEC [FIS2007-66711-C02-02]
- Diputacion Foral de Guipuzcoa
- FUNCAP
- CAPES/FAPERGS
- CNPq [306335/2007-7]
- Rede Nacional de Pesquisa em Nanotubos de Carbono
- Rede de Nanobioestruturas
- Instituto do Milenio de Nanotecnologia (CNPq/MCT-Brazil)
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Magnetic properties of graphenic carbon nanostructures, which are relevant for future spintronic applications, depend crucially on doping and on the presence of defects. In this paper we study the magnetism of the recently detected substitutional Ni (Ni-sub) impurities. Ni-sub defects are nonmagnetic in flat graphene and develop a nonzero-spin moment only in metallic nanotubes. This surprising behavior stems from the peculiar curvature dependence of the electronic structure of Ni-sub. A similar magnetic-nonmagnetic transition of Ni-sub can be expected by applying anisotropic strain to a flat graphene layer.
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