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Related Concept Videos

Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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

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

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

Spin–Spin Coupling: One-Bond Coupling

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

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

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...
Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

Spin-electric coupling in molecular magnets.

Mircea Trif1, Filippo Troiani, Dimitrije Stepanenko

  • 1Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.

Physical Review Letters
|December 31, 2008
PubMed
Summary
This summary is machine-generated.

Researchers discovered a spin-electric coupling in triangular antiferromagnets like Cu3. This allows electric fields to control spin states, paving the way for novel molecular magnet applications and qubit control.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Molecular Magnetism

Background:

  • Triangular antiferromagnets exhibit complex magnetic ordering.
  • Molecular magnets offer potential for nanoscale spintronic devices.
  • Controlling spin states with electric fields is a key challenge in quantum technologies.

Purpose of the Study:

  • Investigate the effect of external electric fields on the triangular antiferromagnet Cu3.
  • Identify mechanisms for electric control of spin states in molecular magnets.
  • Propose experimental methods to detect spin-electric coupling.

Main Methods:

  • Symmetry group analysis to understand fundamental interactions.
  • Hubbard model approach for electronic structure calculations.
  • Theoretical investigation of spin exchange, spin-orbit interaction, and chirality.

Main Results:

  • Identified a novel spin-electric coupling in Cu3.
  • This coupling arises from the interplay of spin exchange, spin-orbit interaction, and spin texture chirality.
  • Demonstrated the potential for electric control of spin (qubit) states.

Conclusions:

  • Spin-electric coupling provides a pathway for electrical manipulation of molecular magnet spins.
  • This effect can be utilized with tools like Scanning Tunneling Microscopy (STM) tips or microwave cavities.
  • Proposed experimental signatures for identifying spin-electric effects in molecular magnets.