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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

11.4K
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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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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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.5K
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,...
1.5K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

1.6K
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 involved orbitals. The...
1.6K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.7K
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...
1.7K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

2.1K
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 one, the...
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Updated: Feb 19, 2026

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A Spin-Texture Spin-Valves With Van Der Waals Magnets.

Bing Zhao1, Roselle Ngaloy1, Lars Sjöström1

  • 1Department of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg, Sweden.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|February 17, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed an all-electrical method to detect spin textures in 2D magnets like Fe5GeTe2 using graphene spin valves. This breakthrough enables direct observation of spin textures in spintronic circuits without microscopy.

Keywords:
2D magnetselectrical detection methodgraphenespin circuitspin texture

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Area of Science:

  • Spintronics
  • 2D Materials Science
  • Condensed Matter Physics

Background:

  • Spin textures in 2D van der Waals (vdW) magnets are crucial for advanced computing.
  • Current detection methods for these spin textures are limited to microscopic techniques.
  • Developing all-electrical detection is key for integrated spintronic applications.

Purpose of the Study:

  • To demonstrate an all-electrical method for detecting spin textures in vdW magnets.
  • To utilize pure spin transport in graphene for nonlocal sensing.
  • To enable room-temperature detection without microscopic characterization.

Main Methods:

  • Fabrication of lateral graphene spin-valve devices with nanoscale constrictions in Fe5GeTe2.
  • Engineering Fe5GeTe2 to create distinct spin textures.
  • Utilizing pure spin transport for nonlocal sensing of spin polarization in graphene.
  • Observing anomalous multi-level spin-valve switching and Hanle spin precession signals.

Main Results:

  • Successful all-electrical detection of spin textures in Fe5GeTe2 at room temperature.
  • Demonstration of distinct spin polarizations injected into graphene from engineered Fe5GeTe2.
  • Observation of anomalous multi-level switching and Hanle spin precession.
  • Contrast with conventional single-domain or magnet-based devices.

Conclusions:

  • The developed all-electrical method provides direct access to spin textures in 2D vdW magnets.
  • This approach is compatible with integrated 2D spintronic circuits.
  • Eliminates the need for ex situ microscopic characterization, paving the way for practical spintronic devices.