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Related Concept Videos

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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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.1K
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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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.2K
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.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.2K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.6K
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...
1.6K
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

1.2K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
1.2K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.0K
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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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Robust Vertical Exchange Bias Modulates Spin Decoherence in 0D Core-Shell Nanoparticles.

Ao Chen1, Guanhua Xu1, Yuting Tang1

  • 1Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China.

ACS Nano
|July 7, 2025
PubMed
Summary

Researchers used core-shell FePt@MnO nanoparticles to control spin decoherence. This novel approach links the exchange-bias effect to spin decoherence time for quantum nanomaterial engineering.

Keywords:
Coherent InterfaceExchange BiasLatticeNanoparticlesSpin Decoherent Dynamic

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Area of Science:

  • Materials Science
  • Quantum Physics
  • Nanotechnology

Background:

  • Two-dimensional materials limit freestanding quantum nanodevices.
  • Spin manipulation is advancing using topological insulators and antiferromagnets.

Purpose of the Study:

  • To engineer freestanding spin-dependent quantum nanomaterials.
  • To control spin decoherence time in magnetic atoms using vertical exchange bias.

Main Methods:

  • Utilized core-shell FePt@MnO nanoparticles (9 nm diameter).
  • Investigated robust vertical exchange bias at the FePt-MnO interface.
  • Analyzed strain-induced lattice distortion and cation alignment.

Main Results:

  • Achieved robust vertical exchange bias, pinning ~17% of interfacial spins.
  • Demonstrated stability of pinned spins even under a -5 T field.
  • Observed a 9.8% shortening of Mn spin decoherence time (τ₂), with concomitant Fe spin decoherence enhancement.

Conclusions:

  • Established a direct link between exchange bias and spin decoherence time.
  • Coherent interfacial engineering modulates quantum material properties.
  • Offers a pathway for developing novel quantum nanomaterials.