Edge state magnetism in zigzag-interfaced graphene via spin susceptibility measurements

Makarova, T. L.; Shelankov, A. L.; Zyrianova, A.A.; Veĭnger, A. I.; Tisnek, T. V.; Lähderanta, E.; Shames, Alexander I.; Окотруб, А. В.; Bulusheva, L. G.; Chekhova, G. N.; Pinakov, D. V.; Asanov, I. P.; Šljivančanin, Željko

doi:10.1038/srep13382

Cited by 44 publications

(29 citation statements)

References 36 publications

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“…Under such conditions, the magnetic susceptibility of graphene, χ, involves three contributions, i.e., χ = χ dia + χ para + χ ferro , where χ dia is the diamagnetic term including orbital, Landau and core diamagnetic contributions, χ para is the paramagnetic term including noninteracting (isolated) defect-induced paramagnetic centers, Pauli paramagnetic contribution from conduction electron and van Vleck contribution, and χ ferro is the FM term describing the magnetic response of interacting defect-induced paramagnetic centers. 37 As expected, pristine TRGO behaved in a diamagnetic manner with only a tiny paramagnetic response at low temperatures (see Figure S1d in Supporting Information) due to paramagnetic centers emerging as a result of defects and/or the negligible content of oxygen functionalities, which were most likely at the edges; the profile of χ mass of TRGO well matched the modified Curie law, i.e., χ mass = χ mass,dia + C / T , where χ mass,dia is the diamagnetic contribution, C is the Curie constant, and T is the temperature.…”

Section: Results and Discussionmentioning

confidence: 99%

Doping with Graphitic Nitrogen Triggers Ferromagnetism in Graphene

et al. 2017

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Nitrogen doping opens possibilities for tailoring the electronic properties and band gap of graphene toward its applications, e.g., in spintronics and optoelectronics. One major obstacle is development of magnetically active N-doped graphene with spin-polarized conductive behavior. However, the effect of nitrogen on the magnetic properties of graphene has so far only been addressed theoretically, and triggering of magnetism through N-doping has not yet been proved experimentally, except for systems containing a high amount of oxygen and thus decreased conductivity. Here, we report the first example of ferromagnetic graphene achieved by controlled doping with graphitic, pyridinic, and chemisorbed nitrogen. The magnetic properties were found to depend strongly on both the nitrogen concentration and type of structural N-motifs generated in the host lattice. Graphenes doped below 5 at. % of nitrogen were nonmagnetic; however, once doped at 5.1 at. % of nitrogen, N-doped graphene exhibited transition to a ferromagnetic state at ∼69 K and displayed a saturation magnetization reaching 1.09 emu/g. Theoretical calculations were used to elucidate the effects of individual chemical forms of nitrogen on magnetic properties. Results showed that magnetic effects were triggered by graphitic nitrogen, whereas pyridinic and chemisorbed nitrogen contributed much less to the overall ferromagnetic ground state. Calculations further proved the existence of exchange coupling among the paramagnetic centers mediated by the conduction electrons.

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Section: Results and Discussionmentioning

confidence: 99%

Doping with Graphitic Nitrogen Triggers Ferromagnetism in Graphene

et al. 2017

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“…An analysis of the literature indicates that there is a great deal of controversy regarding the experimental verification of the theoretical prediction of ferromagnetic edge states at the edges of a ZNRB 50 : for example, all the measurements intended to uncover them are constrained to either charge transport or scanning tunneling microscopy experiments, whose results are open to alternative interpretations. Therefore, the current consensus seems to be that the existence of the magnetic edge states has not been settled yet.…”

Section: Resultsmentioning

confidence: 99%

Spatial structure of correlations around a quantum impurity at the edge of a two-dimensional topological insulator

2017

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We calculate exact zero-temperature real space properties of a substitutional magnetic impurity coupled to the edge of a zigzag silicene-like nanoribbon. Using a Lanczos transformation [Phys. Rev. B 91, 085101 (2015)] and the density matrix renormalization group method, we obtain a realistic description of stanene and germanene that includes the bulk and the edges as boundary one-dimensional helical metallic states. Our results for substitutional impurities indicate that the development of a Kondo state and the structure of the spin correlations between the impurity and the electron spins in the metallic edge state depend considerably on the location of the impurity. More specifically, our real space resolution allows us to conclude that there is a sharp distinction between the impurity being located at a crest or a trough site at the zigzag edge. We also observe, as expected, that the spin correlations are anisotropic due to an emerging Dzyaloshinskii-Moriya interaction with the conduction electrons, and that the edges scatter from the impurity and "snake" or circle around it. Our estimates for the Kondo temperature indicate that there is a very weak enhancement due to the presence of spin-orbit coupling.

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“…The long-range ferromagnetic order in these belts might be robust even above the room temperature. This expectation is based on the similarities with the systems without the intentional O= and H-saturation [40][41][42].…”

Section: Discussionmentioning

confidence: 99%

Ferromagnetic topological crystalline insulating phase in the $$\pi$$-stacked graphene nanobelts under a small pressure

Wierzbowska

2019

SN Appl. Sci.

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This work presents a topological material based on the graphene nanobelts. It is intrinsically magnetic. The band inversion in this system is partial and anomalous, as it was recently found in the Au-doped graphene and 2D molecular crystal. The metallic edge states with the Chern number equal to 1 exist in the ferro-and antiferromagnetic phase. The edge states become gapless at a small pressure, around 0.87 GPa, applied along the stacking axis. Their dispersions are not symmetric for the spin up and down. The graphene nanobelts are-stacked with the AB-type, and the zigzag edges are terminated with the O and H atoms at the opposite sides, in the reversed order along the stacking axis. The propagation of the topological edge states is parallel to the O ⋯ H-interaction direction, across the stacked belts.

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Edge state magnetism in zigzag-interfaced graphene via spin susceptibility measurements

Cited by 44 publications

References 36 publications

Doping with Graphitic Nitrogen Triggers Ferromagnetism in Graphene

Doping with Graphitic Nitrogen Triggers Ferromagnetism in Graphene

Spatial structure of correlations around a quantum impurity at the edge of a two-dimensional topological insulator

Ferromagnetic topological crystalline insulating phase in the $$\pi$$-stacked graphene nanobelts under a small pressure

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