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Related Concept Videos

Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

976
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...
976
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.1K
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...
1.1K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.0K
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,...
1.0K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.1K
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.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
1.1K
Filtration00:53

Filtration

889
Filtration is a physical separation process that involves passing a suspension through a porous medium to separate solids from fluids. During filtration, solids collect on the porous medium while liquids, also collectively known as the filtrate, pass through. The filtration medium is selected based on the filtration purpose, quantity, and nature of the precipitate. The general criteria for a suitable filtering medium are that it is inert, mechanically strong, nonabsorbent toward dissolved...
889

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Related Experiment Video

Updated: Aug 8, 2025

Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
13:58

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Spin filters based on two-dimensional materials Co2Si and Cu2Si.

Yexuan Meng1, Liwei Jiang1, Yisong Zheng1

  • 1Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 2, 2023
PubMed
Summary

This study explores novel spintronic devices using Co2Si and Cu2Si, achieving high spin filter efficiency. These materials offer improved performance over existing spintronic devices, enabling efficient spin current generation.

Keywords:
Co2SiCu2Sispin filterspintronicstwo dimensional materials

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Spintronic devices offer advantages like non-volatility and faster processing over conventional electronics.
  • Efficient generation and injection of pure spin-polarized current remain significant challenges in spintronics.

Purpose of the Study:

  • To investigate the spin filter efficiency of devices constructed from two-dimensional materials Co2Si and Cu2Si.
  • To explore methods for enhancing spin filter efficiency in these novel spintronic devices.

Main Methods:

  • Utilized lattice-matched and band-matched two-dimensional Co2Si and Cu2Si materials.
  • Investigated the impact of gate voltage and series connection on spin filter efficiency.

Main Results:

  • Achieved significantly improved spin filter efficiency using Co2Si and Cu2Si devices.
  • Demonstrated superior performance compared to existing Fe3GeTe2 spin valves and O-graphene-H structures.
  • Obtained comparable spin-polarized current at lower bias voltages than existing devices.

Conclusions:

  • Co2Si and Cu2Si are promising materials for advanced spintronic devices.
  • Gate voltage and series connection effectively enhance spin filter efficiency.
  • These novel devices present a viable alternative for efficient spin current generation.