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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

11.5K
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: 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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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.6K
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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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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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.5K
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...
3.5K
The Hall Effect01:30

The Hall Effect

4.8K
Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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Related Experiment Video

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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing

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Nonlocal Spin Diffusion Driven by Giant Spin Hall Effect at Oxide Heterointerfaces.

Mi-Jin Jin1, Seon Young Moon2, Jungmin Park1

  • 1School of Materials Science and Engineering-Low dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology , Ulsan, 44919, Korea.

Nano Letters
|December 10, 2016
PubMed
Summary

Researchers demonstrate nonlocal spin transport in oxide heterostructures using the spin Hall effect, bypassing low spin injection efficiency. This oxide interface shows high spin-charge conversion efficiency, ideal for spin-orbitronics applications.

Keywords:
Oxide heterointerfaceRashba spin−orbit interactionSpin Hall effectnonlocal spin diffusionspin−orbitronics

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Two-dimensional electron gas (2DEG) at LaAlO3/SrTiO3 interfaces exhibit strong spin-orbit coupling via Rashba interaction, making them promising for spin-orbitronics.
  • Nonlocal spin transport measurements are crucial for spin-orbitronics but are hindered by low spin injection efficiency in these oxide systems.

Discussion:

  • This study overcomes low spin injection limitations by generating spin current via the intrinsic spin Hall effect in the oxide heterostructure.
  • Analysis of nonlocal spin voltage, including Larmor spin precession and length dependence, reveals contributions from both D'yakonov-Perel' and Elliott-Yafet mechanisms to spin relaxation at low temperatures.

Key Insights:

  • The oxide heterointerface demonstrates highly efficient spin-charge conversion, with a significant spin Hall coefficient (γ ∼ 0.15 ± 0.05).
  • This finding validates the oxide interface as a viable platform for studying coupled charge and spin transport.

Outlook:

  • The efficient spin-charge conversion in these oxide systems opens avenues for novel electronic applications in spintronics and spin-orbitronics.
  • Further research can explore optimizing these interfaces for advanced spin-based devices and fundamental studies of spin dynamics.