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Related Concept Videos

Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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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.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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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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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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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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Color in Coordination Complexes
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Valence Bond Theory

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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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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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All-optical spin switching probability in [Tb/Co] multilayers.

L Avilés-Félix1,2, L Farcis3, Z Jin3

  • 1Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG-SPINTEC, 38000, Grenoble, France. lavilesf@cab.cnea.gov.ar.

Scientific Reports
|March 23, 2021
PubMed
Summary
This summary is machine-generated.

Atomistic spin simulations reveal all-optical switching in [Tb/Co] multilayers. Optimized Tb/Co ratios enable thermally-induced magnetization switching with potential for sub-picosecond reversal in spintronic devices.

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Area of Science:

  • Spintronics
  • Materials Science
  • Computational Physics

Background:

  • All-optical switching is crucial for advanced spintronic devices.
  • Finding suitable magnetic systems for laser-controlled magnetization is an ongoing challenge.
  • Multilayered structures offer tunable magnetic properties.

Purpose of the Study:

  • To investigate all-optical switching in [Terbium/Cobalt] multilayers using atomistic spin simulations.
  • To determine the conditions for thermally-induced magnetization switching (TIMS) by varying sample composition and laser fluence.
  • To explore the potential for sub-picosecond magnetization reversal.

Main Methods:

  • Atomistic spin simulations.
  • Two-temperature model for calculating thermal effects and magnetization dynamics.
  • Systematic variation of multilayer composition (n monolayers of Tb, m monolayers of Co) and laser fluence.

Main Results:

  • Thermally-induced magnetization switching observed in [Tb/Co] multilayers with specific compositions (e.g., [1/1], [1/3]).
  • Switching mechanism involves residual Tb magnetization, with Co fully demagnetized.
  • Switching determinism is tunable via damping parameter; intermixing at interfaces reduces stochasticity.

Conclusions:

  • Predicts the possibility of thermally-induced magnetization switching in [Tb/Co] multilayers for the first time.
  • Suggests potential for sub-picosecond magnetization reversal using single laser pulses.
  • Highlights the role of composition and interface engineering in controlling all-optical switching.