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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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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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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
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Enhanced spin-orbit coupling in tetragonally strained Fe-Co-B films.

R Salikhov1, L Reichel2,3, B Zingsem1

  • 1Faculty of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, 47057 Duisburg, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 23, 2017
PubMed
Summary

Adding interstitial boron to iron-cobalt-boron alloys enhances spin-orbit coupling. This research demonstrates how doping with boron can tune magnetic properties by controlling crystal symmetry and strain in advanced magnetic materials.

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Magnetism

Background:

  • Epitaxial growth of thin films is crucial for advanced electronic devices.
  • Tetragonal strain influences magnetic properties in alloys.
  • Interstitial doping can modify material symmetry and electronic structure.

Purpose of the Study:

  • To synthesize and characterize tetragonally strained Fe-Co-B alloys.
  • To investigate the effect of interstitial boron on magnetic properties, particularly spin-orbit coupling (SOC).
  • To explore methods for enhancing magnetocrystalline anisotropy and orbital magnetic moments.

Main Methods:

  • Epitaxial film growth of Fe-Co-B on AuCu buffer layers.
  • Stabilization of tetragonal strain (c/a ratios) via controlled boron doping.
  • Ferromagnetic resonance (FMR) and X-ray magnetic circular dichroism (XMCD) measurements.
  • First-principles calculations to understand atomic-level effects.

Main Results:

  • Increased c/a ratio (1.013, 1.034, 1.02) with boron concentration (0, 4, 10 at.%) was achieved.
  • Total orbital magnetic moment significantly increased with higher c/a ratios.
  • Enhanced spin-orbit coupling (SOC) observed due to reduced crystal symmetry and interstitial boron.
  • First-principles calculations confirmed B impurities in octahedral sites enhance orbital magnetic moments.

Conclusions:

  • Interstitial boron doping effectively enhances SOC phenomena in Fe-Co-B alloys.
  • Stabilizing anisotropic strain via 4 at.% B doping offers a route to tune magnetocrystalline anisotropy and orbital moment.
  • Boron doping influences film microstructure, coercive field, and magnetic relaxation.