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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...
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Atomic Nuclei: Nuclear Spin State Overview

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...
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

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Related Experiment Video

Updated: May 18, 2026

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Published on: June 28, 2018

Towards coherent spin precession in pure-spin current.

Hiroshi Idzuchi1, Yasuhiro Fukuma, YoshiChika Otani

  • 1Institute for Solid State Physics, University of Tokyo, Kashiwa, Japan.

Scientific Reports
|September 7, 2012
PubMed
Summary

Dual injectors in lateral spin valves reveal improved spin coherency with longer channels. This spin current property is material-independent, offering insights into spin transport.

Area of Science:

  • Condensed matter physics
  • Spintronics
  • Quantum mechanics

Background:

  • Non-local spin injection creates pure spin currents, a flow of spin angular momentum without net charge.
  • Diffusive spins lose phase coherency due to collisions, leading to varied dwell times in transport channels.

Purpose of the Study:

  • To investigate the phase coherency of in-plane spin precession in lateral spin valves.
  • To demonstrate that channel length influences spin coherency.
  • To explore the material-independent nature of spin coherency.

Main Methods:

  • Utilizing lateral spin valves with dual injectors.
  • Applying the Hanle effect to detect in-plane spin precession signals.
  • Varying channel length and injector-detector separation.

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Main Results:

  • A genuine in-plane precession signal was detected using the Hanle effect in dual-injector lateral spin valves.
  • Spin coherency in in-plane precession improves with increasing channel length.
  • Spin coherency exhibits universal, material-independent behavior across metals, semiconductors, and graphene.

Conclusions:

  • Lateral spin valves with dual injectors can detect genuine in-plane spin precession.
  • Channel length is a critical factor in maintaining spin coherency.
  • The observed universal behavior of spin coherency has broad implications for spintronic device design.