Nanolines of transition metals ruled by grain boundaries in graphene: An ab initio study

Lima, Francielly Dornelas Correia; Miwa, R. H.

doi:10.1016/j.matchemphys.2017.03.031

Cited by 5 publications

(4 citation statements)

References 43 publications

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“…This experimental pioneering work corroborates numerous theoretical calculations predicting that the reduced symmetry of 1D magnetic systems produces strong modifications of the electronic band structure and thus, significant effects on the MAE are expected [6][7][8][9]. The attractiveness of these 1D magnetic systems is reinforced with the recent theoretical prediction of an anisotropic spin-polarized electronic current along TM nanolines, such as Mn, Fe or Co nanolines on graphene [10], which opens the possibility of their integration in spintronic-based devices.…”

Section: Introductionsupporting

confidence: 81%

Magnetic anisotropy of one-dimensional Co nanostructures

et al. 2020

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We report a combined scanning tunneling microscopy and x-ray magnetic circular dichroism study to investigate the structural properties and magnetic behavior of a Co ultrathin film composed of dimer nanolines. These Co nanolines,  6 nm in length, are grown on a Si nanotemplate composed of nanoribbons self-organized on Ag(110). The first two Co layers present a weak magnetic response while upper Co layers exhibit an enhanced magnetization. Orbital and spin moments are experimentally determined. We show that an in-plane magnetization is favored and the magnetic anisotropy energy associated with the directions parallel and perpendicular to the nanolines are measured. The Co ultrathin film is shown to behave as a superparamagnetic system composed of onedimensional segments containing each  170 ferromagnetically coupled Co atoms, with a blocking temperature estimated to be between 20 K and 40 K. Our set of experiments allows for a comprehensive description of the magnetic behavior of the Co nanoline ultrathin film grown on a functionalized metallic substrate.

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Section: Introductionsupporting

confidence: 81%

Magnetic anisotropy of one-dimensional Co nanostructures

et al. 2020

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“…Besides, by increasing the concentration of the TM adatoms, nano-lines can be formed due to the strengthening of the energetic stability of the TM/grain boundary systems. 229 Graphene oxide (GO) is a complex nonstoichiometric material possessing a layered structure, with physico-chemical properties, which are highly dependent on synthesis procedures and post-synthesis treatments. [230][231][232] The various strategies and application of metal NP deposition on GO have been reported elsewhere.…”

Section: Graphene and Few Layer Graphenementioning

confidence: 99%

“…It can also act like very localized anchoring sites, with stronger adsorption energies on the line defects for metal , or Li atoms, and at the same time lowers diffusion barrier energy along the grain boundary. Besides, by increasing the concentration of the TM adatoms, nanolines can be formed due to the strengthening of the energetic stability of the TM/grain boundary systems …”

Section: How Do Metal Nanoparticles Clusters or Single Metal Atoms In...mentioning

confidence: 99%

A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

2019

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Fermi level in vii) are shown in purple in ii)-vi) with an iso-value of ±0.003 a.u. Reprinted with permission from ref 57 . Copyright 2014 from the Royal Society of Chemistry; b) Molecular model of a corannulene-like element functionalized with three carboxylic groups from two different perspectives in the cpk representation (on the left). The final structure (190 elements in a cubic cell of 60 Å in size) obtained from random packing of the individual elements (on the right). Cyan: carbon, red: oxygen, white: hydrogen. Reprinted with permission from ref 59 Copyright 2017 from Elsevier; c) Side-views of Ru13 adsorbed on Gr-DV-2COOH site before (on left panel) and after a proton jump (right panel). C atoms are in black, O in red, H in with white and Ru in mocha. Reprinted with permission from ref 60 Copyright 2014 from Elsevier; and d) Spin-density projection in µB/a.u. 2 on the graphene plane around i) the hydrogen chemisorption defect (∆) and ii) the vacancy defect in the a sublattice. Carbon atoms corresponding to the a sublattice (o) and to the b sublattice (•) are distinguished. Simulated STM images of the defects are shown in iii) and iv), respectively. Reprinted with permission from ref 61 .

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“…Graphene functionalization and interfacing have also brought a degree of freedom in tunning its properties [9][10][11] . For instance, upon transition metal absorption/interfacing, graphene presents magnetic [12][13][14][15] and topological [16][17][18][19] phases ruled by the spin-orbit coupling. One lasting challenge in graphene systems is creating semiconducting phases with a wider gap to expand its application in nanoelectronics and photonics.…”

Section: Introductionmentioning

confidence: 99%