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π Electron Effects on Chemical Shift: Overview01:27

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Magnetic clusters as efficient EY-like spin-scattering centres in graphene.

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Magnetic nickel clusters on graphene cause spin scattering via an Elliot-Yafet mechanism. This study quantifies spin-orbit coupling effects from these adsorbates using transport measurements and theoretical calculations.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Surface science

Background:

  • Graphene's unique electronic properties are sensitive to surface modifications.
  • Magnetic adsorbates can significantly alter electron spin dynamics in 2D materials.

Purpose of the Study:

  • To investigate spin scattering mechanisms induced by magnetic nickel clusters on graphene.
  • To quantify the impact of these clusters on graphene's spin transport properties.

Main Methods:

  • Fabrication and characterization of a graphene field-effect transistor (FET) with nickel clusters.
  • Transport measurements to probe spin scattering.
  • First-principles density functional theory (DFT) calculations combined with a tight-binding model.

Main Results:

  • Nickel clusters act as significant spin scatterers on graphene.
  • An Elliot-Yafet-like spin scattering mechanism was identified.
  • The strength of induced spin-orbit coupling by the clusters was quantified.

Conclusions:

  • Atomically precise nickel clusters introduce measurable spin scattering in graphene.
  • The findings provide insights into controlling spin dynamics in graphene-based spintronic devices.