Magnetic Anisotropy and Engineering of Magnetic Behavior of the Edges in Co Embedded Graphene Nanoribbons

Lisenkov, S.; Andriotis, Antonis N.; Menon, Madhu

doi:10.1103/physrevlett.108.187208

Cited by 53 publications

(32 citation statements)

References 23 publications

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“…The asymmetric case, instead, is a half-metal near the Fermi energy E F ; namely it is metallic for spin up and insulating for spin down. The halfmetallic character of our systems provides opportunities as spin filters without the need of external electric fields [29], magnetic fields [30], ferromagnetic strips [31], impurities [32][33][34] or defects [35,36]. Furthermore, there is the opposite half-metallic character at higher energies.…”

Section: Edges Terminated By Armchair Nanotubesmentioning

confidence: 99%

Electronic, magnetic and transport properties of graphene ribbons terminated by nanotubes

Akhukov¹,

Yuan²,

Fasolino³

et al. 2012

New J. Phys.

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We study, by density functional and large-scale tight-binding transport calculations, the electronic structure, magnetism and transport properties of the recently proposed graphene ribbons with edges rolled to form nanotubes. Edges with armchair nanotubes present magnetic moments localized either in the tube or the ribbon and of metallic or half-metallic character, depending on the symmetry of the junction. These properties have potential for spin valve and spin filter devices with advantages over other proposed systems. Edges with zigzag nanotubes are either metallic or semiconducting without affecting the intrinsic mobility of the ribbon. Varying the type and size of the nanotubes and ribbons offers the possibility to tailor the magnetic and transport properties, making these systems very promising for applications.

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Section: Edges Terminated By Armchair Nanotubesmentioning

confidence: 99%

Electronic, magnetic and transport properties of graphene ribbons terminated by nanotubes

Akhukov¹,

Yuan²,

Fasolino³

et al. 2012

New J. Phys.

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“…6,7 Thus the composite structure, i.e. For example, recent ab initio calculations showed that a ferromagnetic spin order can be established when doping transition metal atoms (TMAs) into graphene.…”

Section: Introductionmentioning

confidence: 99%

First-principles study of 3d transition metal atom adsorption onto graphene: the role of the extended line defect

Zhu

Zheng

2014

J. Mater. Chem. C

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A type of extended line defect (ELD) with two pentagons plus an octagon as the basic unit is currently an experimentally available topological defect in the graphene lattice, which brings about some interesting modifications to the electronic properties of graphene. Within the framework of density functional theory (DFT), we perform a systematic calculation to clarify the role of the ELD in 3d-transition metal atom (TMA) adsorption onto the graphene surface. We find that, in contrast to the ordinary lattice position of graphene, the ELD presents a much stronger adsorption for the TMAs(Sc-Cu). Thus, the presence of ELD provides a feasible approach to pattern magnetic impurities onto the graphene surface in a controllable and self-assembled way. In addition, our calculation indicates that as the adatom near the ELD alters from Sc to Cu, the spin moment and the adsorption energy show intricate variations. By means of symmetry analysis, we establish a hybridization picture between the TMA orbitals and the p z orbital of graphene, by which these numerical results are reasonably explained. Finally, by calculating the electronic transport properties based on the DFT and nonequilibrium Green function technique, we find that when the electron tunnels through an ELD with Co or Fe adsorption, the maximum spin-filter efficiency can reach 85% and 97%, respectively, with a bias voltage less than 0.6 V. Therefore, these composite structures of graphene with TMA adsorbed by the ELD can be considered as a prototype of a spin-filter device.

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“…Our work over the last three years has led to several publications in quality journals [1,2,3,4,5,6,7,8,9,10,11,12]. The expertise gained in the prior investigations will provide valuable insights, contributing to the success of the present project.…”

mentioning

confidence: 80%

Magnetism in Non-Traditional Materials

Menon¹

2013

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Using the DOE support we have shown the following:• We performed a systematic microscopic investigation of two completely dissimilar materials (namely, ZnO and rhombohedral-C 60 polymers) exhibiting ferromagnetism in the presence of defects, and showed that this new phenomena has a common origin and the mechanism responsible can be used as a powerful tool for inducing and tailoring magnetic features in systems which are not magnetic otherwise. Based on our findings we proposed a general recipe for developing ferromagnetism in new materials of great technological interest. Our results support the role of complimentary pairs of defects in inducing magnetism in otherwise non-magnetic materials belonging to two widely differing classes with no apparent correlation between them. In both classes, ferromagnetism is found to be enhanced when the two kinds of defects form structures (pathways) of alternating effective donor and acceptor crystal sites leading to the development of electron charge and spin density like waves.

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Magnetic Anisotropy and Engineering of Magnetic Behavior of the Edges in Co Embedded Graphene Nanoribbons

Cited by 53 publications

References 23 publications

Electronic, magnetic and transport properties of graphene ribbons terminated by nanotubes

Electronic, magnetic and transport properties of graphene ribbons terminated by nanotubes

First-principles study of 3d transition metal atom adsorption onto graphene: the role of the extended line defect

Magnetism in Non-Traditional Materials

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