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Related Concept Videos

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Atomic Nuclei: Nuclear Spin State Overview

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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 one, the...
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Atomic-scale spin-polarization maps using functionalized superconducting probes.

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  • 1Department of Physics, University of Hamburg, D-20355 Hamburg, Germany.

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|February 1, 2021
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Summary
This summary is machine-generated.

Researchers developed a new magnetic tip for scanning tunneling microscopy (STM) that quantitatively measures spin polarization. This advancement enables precise analysis of magnetic nanomaterials at the atomic scale.

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Area of Science:

  • Materials Science
  • Surface Science
  • Quantum Physics

Background:

  • Scanning tunneling microscopy (STM) with magnetic tips maps spin structures at the atomic scale.
  • Conventional magnetic STM tips often lack the ability to quantitatively determine sample spin polarization.
  • Magnetic impurities in superconductors create unique spin-polarized states.

Purpose of the Study:

  • To develop a novel magnetic STM tip for quantitative spin polarization measurements.
  • To probe the spin polarization of atom-manipulated nanomagnets.
  • To achieve atomic-scale characterization of spin properties.

Main Methods:

  • Functionalizing a superconducting Niobium (Nb) STM tip apex with iron (Fe) atoms to create impurity states.
  • Utilizing the functionalized Nb tip to perform spin-polarized STM measurements on manganese (Mn) nanomagnets on a Nb(110) surface.
  • Comparing results with measurements from conventional Chromium (Cr) bulk tips.

Main Results:

  • Demonstrated extraordinary spin sensitivity with the functionalized superconducting tip.
  • Successfully measured quantitative spin polarization values of Mn nanomagnets near the Fermi level.
  • Validated the new probe's capability through comparison with established methods.

Conclusions:

  • The developed functionalized superconducting STM tip enables quantitative measurement of sample spin polarization.
  • This technique offers unprecedented atomic-scale insight into the spin properties of magnetic materials.
  • The method opens new avenues for studying spin-polarized phenomena in nanoscale magnetic systems.