Magnetic Properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi mathvariant="normal">C</mml:mi><mml:mn mathvariant="normal">60</mml:mn></mml:msub></mml:math>Polymers

Andriotis, Antonis N.; Menon, Madhu; Sheetz, R. Michael; Чернозатонский, Л. А.

doi:10.1103/physrevlett.90.026801

Cited by 139 publications

(103 citation statements)

References 21 publications

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“…In addition to polymerized fullerenes, 120 nanotubes, 121 graphite, 122 and nanodiamonds, 123 magnetism was recently reported for graphene produced from graphene oxide. 124 On the basis of calculations, the observed magnetic behavior in all these systems was explained in terms of defects in the graphitic network (either native or produced by ion irradiation) such as under-coordinated carbon atoms, for example, vacancies, 125 interstitials, 126 carbon adatoms, 47 and atoms at the edges of graphitic nanofragments with dangling bonds either passivated with hydrogen atoms or free. 127 Such defects have local magnetic moments and may give rise to flat bands and eventually to the development of magnetic ordering.…”

Section: Properties Of Defective Graphenementioning

confidence: 99%

Structural Defects in Graphene

2010

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Graphene is one of the most promising materials in nanotechnology. The electronic and mechanical properties of graphene samples with high perfection of the atomic lattice are outstanding, but structural defects, which may appear during growth or processing, deteriorate the performance of graphenebased devices. However, deviations from perfection can be useful in some applications, as they make it possible to tailor the local properties of graphene and to achieve new functionalities. In this article, the present knowledge about point and line defects in graphene are reviewed. Particular emphasis is put on the unique ability of graphene to reconstruct its lattice around intrinsic defects, leading to interesting effects and potential applications. Extrinsic defects such as foreign atoms which are of equally high importance for designing graphene-based devices with dedicated properties are also discussed.

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Section: Properties Of Defective Graphenementioning

confidence: 99%

Structural Defects in Graphene

2010

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“…These, in turn, can be coupled ferromagnetically with the mediating services of another type of codopant (defect) 1,[23][24][25][26] . One can, thus, invoke the existence of a dormant bipartite structure with the potential to get activated in the presence of the appropriate codopants.…”

Section: B Defect Synergymentioning

confidence: 99%

“…This led to the suggestion 1,[23][24][25][26] that the enhanced magnetism found in bipartite codopant structures we studied [(Ti(3Co,2Cr)O 2 , Ga(Co,Cu)N, Zn(Co,Cu)O and Ga(Mn,Cu)N) as well as C-based materials], is reminiscent of proposed bipartite model descriptions spanning a diverse sample of electronic processes considered to have a leading role in developing magnetic features. The models referred to in this context included the following:…”

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confidence: 99%

Defect-induced magnetism: Codoping and a prescription for enhanced magnetism

Andriotis

Menon

2013

Phys. Rev. B

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Recent works have given indication that the defect induced magnetism in diluted magnetic semiconductors (DMSs), transition metal oxides (TMOs) and related materials is facilitated and enhanced by codoping and the synergistic action among the codopants. In the present work, we demonstrate that the proposed defect-induced ferromagnetic coupling (FMC) exhibits the following features; bipartition, synergy and locality and is based on the formation and interaction among spinpolarized neighborhoods analogous to spin-polarized radicals centered at the codopant sites. The FMC is mediated by the molecular orbitals (MOs) of these radicals and is greatly facilitated if the codopant-centered radicals could form bipartite configurations within the host lattices. Within this picture, the origin of magnetism in DMSs and TMOs appears to be the synergy and the interplay between correlated spin-polarization processes that take place in a successive way within neighborhoods centered at the codopants and include their first nearest neighbors (1nn's). The proposed model can be used as a practical guide for choosing the appropriate pair of codopants for a specific semiconductor environment that can lead to the fabrication of DMSs and TMOs with enhanced magnetic properties.

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“…Earlier simulations showed that CA and some other defects in nanotubes and other carbon nanomaterials 95,96 can have local magnetic moments. Although the standard STM with the tip made from a nonmagnetic material probes simultaneously the LDOS corresponding to majority and minority spins, an account for magnetism can change the positions of defect-induced peaks.…”

Section: G Spin-polarized Calculationsmentioning

confidence: 99%

Modifying the electronic structure of semiconducting single-walled carbon nanotubes byAr+ion irradiation

et al. 2009

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Local controllable modification of the electronic structure of carbon nanomaterials is important for the development of carbon-based nanoelectronics. By combining density-functional theory simulations with Arion-irradiation experiments and low-temperature scanning tunneling microscopy and spectroscopy ͑STM/STS͒ characterization of the irradiated samples, we study the changes in the electronic structure of single-walled carbon nanotubes due to the impacts of energetic ions. As nearly all irradiation-induced defects look as nondistinctive hillocklike features in the STM images, we compare the experimentally measured STS spectra to the computed local density of states of the most typical defects with an aim to identify the type of defects and assess their abundance and effects on the local electronic structure. We show that individual irradiationinduced defects can give rise to single and multiple peaks in the band gap of the semiconducting nanotubes and that a similar effect can be achieved when several defects are close to each other. We further study the stability of defects and their evolution during STM measurements. Our results not only shed light on the abundance of the irradiation-induced defects in carbon nanotubes and their signatures in STS spectra but also suggest a way the STM can be used for engineering the local electronic structure of defected carbon nanotubes.

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Magnetic Properties ofC60Polymers

Cited by 139 publications

References 21 publications

Structural Defects in Graphene

Structural Defects in Graphene

Defect-induced magnetism: Codoping and a prescription for enhanced magnetism

Modifying the electronic structure of semiconducting single-walled carbon nanotubes byAr+ion irradiation

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