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Träfflista för sökning "WFRF:(Rellinghaus Bernd) srt2:(2018)"

Sökning: WFRF:(Rellinghaus Bernd) > (2018)

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1.
  • Schneider, Sebastian, et al. (författare)
  • Simple method for optimization of classical electron magnetic circular dichroism measurements : The role of structure factor and extinction distances
  • 2018
  • Ingår i: Physical Review Materials. - : AMER PHYSICAL SOC. - 2475-9953. ; 2:11
  • Tidskriftsartikel (refereegranskat)abstract
    • Electron magnetic circular dichroism (EMCD), the electron wave analog of x-ray magnetic circular dichroism (XMCD), allows for the element specific measurement of the spin and orbital magnetic moments with up to nanometer resolution. However, due to dynamical diffraction effects, the signal-to-noise ratios of EMCD spectra are often very low. We describe a simple set of rules, how to set up a geometry for a classical EMCD experiment on an arbitrary crystal structure to get a maximum dichroic signal. The procedure is based on an evaluation of the structure factor and extinction distances. Proof-of-concept simulations and experiments on a FeGe crystal present a successful test of these guidelines.
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2.
  • Ta, Huy Q., et al. (författare)
  • Single Cr atom catalytic growth of graphene
  • 2018
  • Ingår i: Nano Reseach. - : TSINGHUA UNIV PRESS. - 1998-0124 .- 1998-0000. ; 11:5, s. 2405-2411
  • Tidskriftsartikel (refereegranskat)abstract
    • Single atoms are the ultimate minimum size limit for catalysts. Graphene, as an exciting, ultimately thin (one atom thick) material can be imaged in a transmission electron microscope with relatively few imaging artefacts. Here, we directly observe the behavior of single Cr atoms in graphene mono- and di-vacancies and, more importantly, at graphene edges. Similar studies at graphene edges with other elemental atoms, with the exception of Fe, show catalytic etching of graphene. Fe atoms have been shown to both etch and grow graphene. In contrast, Cr atoms are only observed to induce graphene growth. Complementary theoretical calculations illuminate the differences between Fe and Cr, and confirm single Cr atoms as superior catalysts for sp(2) carbon growth.
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  • Resultat 1-2 av 2

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