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Related Concept Videos

Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

980
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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Valence Bond Theory02:42

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...
9.0K
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
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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Graphene Spin Valves for Spin Logic Devices.

Pramod Ghising1, Chandan Biswas1, Young Hee Lee1,2

  • 1Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea.

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Summary
This summary is machine-generated.

Graphene spin valves offer a low-power alternative to traditional electronics by utilizing electron spin. This review explores their advancements and potential for future spin logic devices.

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Area of Science:

  • Spintronics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Charge-based electronics face limitations in scalability and power consumption.
  • Spintronics leverages electron spin for information processing, offering a potential alternative.
  • Graphene exhibits excellent properties for spintronics, including long spin-diffusion length at room temperature.

Purpose of the Study:

  • To review advancements in graphene spin valves (SVs).
  • To examine the role of graphene SVs in developing spin logic devices.
  • To compare the energy efficiency of graphene SVs with charge-based field-effect transistors (FETs).

Main Methods:

  • Review of existing literature on graphene spin valves and spin transport.
  • Discussion of charge and spin transport and scattering mechanisms in graphene.
  • Comparative analysis of on/off switching energy between graphene SVs and charge-based FETs.

Main Results:

  • Graphene SVs show promise for scalable spintronics due to long spin-diffusion length.
  • Graphene SVs are crucial for developing various spin devices like spin field-effect transistors and logic gates.
  • Graphene SVs demonstrate potential for low-power operation compared to conventional FETs.

Conclusions:

  • Graphene SVs are key components for the advancement of spin logic devices.
  • Understanding spin transport mechanisms in graphene is vital for future development.
  • Graphene-based spintronics presents a promising pathway towards energy-efficient electronic devices.