Magnetization profile for impurities in graphene nanoribbons

Power, Stephen R.; Menezes, Vivian Machado de; Fagan, Solange B.; Ferreira, M. S.

doi:10.1103/physrevb.84.195431

Cited by 21 publications

(14 citation statements)

References 51 publications

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“…Due to the open surface controlled adatoms manipulation is within reach of atomic force microscopy in these systems [29,30]. In the last few years several studies focused on understanding structural, electronic and magnetic properties of 3d impurities in graphene nanoribbons [31][32][33][34][35][36]. Also vacancies and defects have been predicted to give rise to magnetic moments [37,38].…”

Section: Introductionmentioning

confidence: 99%

Kondo effect of a cobalt adatom on a zigzag graphene nanoribbon

2014

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Based on ab-initio calculations we discuss Kondo effect due to Co adatom on graphene zigzag nanoribbon. Co atom located at hollow site behaves as spin S = 1/2 impurity with d xz and d yz orbitals contributing to magnetic moment. Dynamical correlations are analyzed with the use of complementary approximations: mean field slave boson approach, noncrossing approximation and equation of motion method. The impact of interplay between spin and orbital degrees of freedom together with the effect of peculiarities of electronic and magnetic structure of nanoribbon on many-body resonances is examined. PACS numbers: 73.22.Pr, 73.23.-b, 75.20.Hr, 85.75.-d arXiv:1307.5872v1 [cond-mat.mes-hall]

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Section: Introductionmentioning

confidence: 99%

Kondo effect of a cobalt adatom on a zigzag graphene nanoribbon

2014

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“…21 The strong impurity site dependence of GNRs behavior has been observed, including transport 22,23 and magnetic properties. 24 Several studies have also addressed atom doping of GNRs with metal [25][26][27][28] and N atoms. 29 Interestingly, the SGS behavior has been found in ZGNRs with nitrogen doping at the edge, 29 and in boron nitride nanoribbons with vacancies.…”

Section: Introductionmentioning

confidence: 99%

Gold-embedded zigzag graphene nanoribbons as spin gapless semiconductors

Zhang

Sun

et al. 2012

Phys. Rev. B

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Using density-functional theory calculations, we studied the electronic and magnetic properties of zigzag graphene nanoribbons (ZGNRs) with gold (Au) atoms embedded into different sites of the ZGNRs. Strong site dependence was found, and the system had the ferromagnetic or antiferromagnetic ground state depending on the Au atom position. Spin gapless semiconductor (SGS) behavior was observed when the Au atom was embedded into the center and edge sites of the ZGNRs. The simulations showed that the electronic structure of the ribbon strongly depends on ZGNR width, but the SGS behavior is always present when the Au atom is embedded into the center and edge sites. The SGS properties were also found to be dependent on impurity atom concentration, so that they can be tuned by either selecting the proper positions of Au atoms or changing their concentration. Our results suggest a flexible way of designing SGSs, which could be used in various spintronic, electronic, and optoelectronic applications.

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“…41 Furthermore, it has been shown recently that the magnetic properties of transition-metaldoped ZGNRs are more robust than those moments arising due to the edge geometry. 42 The most attractive feature of patterning graphene with partial hydrogenation is the similarity of creating bare carbon channels having edge-state properties similar to those of graphene nanoribbons. Recently, edge states of the graphene-graphane interface have been studied using the tight-binding approximation and it was shown that the edge state of an interface oriented along a zigzag direction enhances the effects related to the spin-orbit interaction.…”

Section: Introductionmentioning

confidence: 99%

Magnetic impurities in graphane with dehydrogenated channels

2012

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We have investigated the electronic and magnetic response of a single Fe atom and a pair of interacting Fe atoms placed in patterned dehydrogenated channels in graphane within the framework of density functional theory. We have considered two channels: "armchair" and "zigzag" channels. Fully relaxed calculations have been carried out for three different channel widths. Our calculations reveal that the response to the magnetic impurities is very different for these two channels. We have also shown that one can stabilize magnetic impurities (Fe in the present case) along the channels of bare carbon atoms, giving rise to a magnetic insulator or a spin gapless semiconductor. Our calculations with spin-orbit coupling shows a large in-plane magnetic anisotropy energy for the case of the armchair channel. The magnetic exchange coupling between two Fe atoms placed in the semiconducting channel with an armchair edge is very weakly ferromagnetic whereas a fairly strong ferromagnetic coupling is observed for reasonable separations between Fe atoms in the zigzag-edged metallic channel with the coupling mediated by the bare carbon atoms. The possibility of realizing an ultrathin device with interesting magnetic properties is discussed

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Magnetization profile for impurities in graphene nanoribbons

Cited by 21 publications

References 51 publications

Kondo effect of a cobalt adatom on a zigzag graphene nanoribbon

Kondo effect of a cobalt adatom on a zigzag graphene nanoribbon

Gold-embedded zigzag graphene nanoribbons as spin gapless semiconductors

Magnetic impurities in graphane with dehydrogenated channels

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