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Related Concept Videos

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

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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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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...
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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.
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Exploiting Spin Fluctuations for Enhanced Pure Spin Current.

Po-Hsun Wu1,2, Danru Qu3, Yen-Chang Tu1

  • 1Department of Physics, National Taiwan University, Taipei 10617, Taiwan.

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|June 17, 2022
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Summary
This summary is machine-generated.

Researchers achieved a high spin Hall angle in Ni-Cu alloys by controlling spin current and fluctuation interactions. This breakthrough enhances 3D magnets for spintronic applications, enabling efficient charge-to-spin conversion.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Understanding spin current phenomena is crucial for developing advanced spintronic devices.
  • The spin Hall effect (SHE) is a key mechanism for converting charge currents into spin currents.

Purpose of the Study:

  • To investigate the interplay of pure spin current, spin-polarized current, and spin fluctuation in 3d NiₓCu₁₋ₓ alloys.
  • To enhance the spin Hall angle for efficient charge-to-spin conversion in spintronic applications.

Main Methods:

  • Tuning the composition of NiₓCu₁₋ₓ alloys to separate different current effects.
  • Exploiting the interaction between spin current and spin fluctuation in Ni-Cu alloys.
  • Utilizing the anomalous Nernst effect for magnetic phase transition detection.

Main Results:

  • Achieved an unprecedentedly high spin Hall angle of 46% at room temperature in specific Ni-Cu alloys.
  • Demonstrated that the enhanced spin Hall angle is approximately 5 times larger than that in Platinum.
  • Showcased spin-dependent thermal transport via the anomalous Nernst effect as a sensitive magnetometer for magnetic phase transitions.

Conclusions:

  • Composition control in 3D magnets can significantly enhance the spin Hall angle by exploiting spin current fluctuations.
  • Ni-Cu alloys with enhanced spin Hall angles are promising functional materials for charge-to-spin conversion in spintronics.
  • The anomalous Nernst effect provides a viable method for electrical probing of magnetic phase transitions in thin films.