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NMR Spectroscopy: Spin–Spin Coupling

NMR Spectroscopy: Spin–Spin Coupling

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 in...

Atomic Nuclei: Nuclear Spin State Overview

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...

Spin–Spin Coupling Constant: Overview

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...

Atomic Nuclei: Magnetic Resonance

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...

Double Resonance Techniques: Overview

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

Atomic Nuclei: Nuclear Relaxation Processes

Atomic Nuclei: Nuclear Relaxation Processes

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. This...

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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Long-range spin Seebeck effect and acoustic spin pumping.

K Uchida, H Adachi, T An

Nature Materials

|August 23, 2011

Summary

Electrons in a metallic wire can sense their position on an insulator, generating voltage via spin-phonon coupling. This discovery enables acoustic spintronics, using sound waves for spin-based devices.

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Area of Science:

Condensed Matter Physics
Materials Science
Spintronics

Background:

Investigating the long-range nature of the spin Seebeck effect in metallic/insulator heterostructures.
Exploring the interaction between electron spins and lattice vibrations (phonons) in position-sensitive devices.
Utilizing a NiFe/Pt bilayer on a sapphire substrate to study spin-phonon coupling.

Discussion:

Demonstrated that electrons in a NiFe/Pt wire can detect their specific location on an insulating sapphire plate.
Observed a non-local voltage generation in the Pt layer under a temperature gradient, irrespective of electrical or magnetic isolation.
Identified spin-phonon coupling as the mechanism responsible for this position-dependent voltage generation.

Key Insights:

The position of a metallic wire on an insulator can influence electronic properties through spin-phonon interactions.
Sound waves can directly manipulate electron spins, a phenomenon termed 'acoustic spin pumping'.
This work elucidates the long-range spin transport mechanisms in spintronic systems.

Outlook:

Paving the way for 'acoustic spintronics,' utilizing sound waves for spin manipulation.
Developing novel spin-based devices controlled by acoustic signals.
Further research into the fundamental physics of spin-phonon coupling and its applications.