Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

862
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...
862
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.2K
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...
1.2K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

940
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...
940
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.0K
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...
1.0K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

922
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,...
922
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

178
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...
178

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Wafer-Scale Room-Temperature Ferromagnetic Chromium Disulfide via Sulfur Monomers.

Nano letters·2026
Same author

Giant unusual anisotropic magnetoresistance enabled by hole-electron resonance in van der Waals heterostructures.

Nature communications·2026
Same author

Quasi-Second-Order Martensitic Phase Transition by Flexomagnetic Coupling.

Nano letters·2025
Same author

Unusual Van der Waals Magnetoresistance in Stacked Ferromagnetic Fe<sub>3</sub>GeTe<sub>2</sub>: The Role of Atomically Sharp Interfaces.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2025
Same author

Giant Exchange Bias in Antiferromagnetic Mixed-Valence MOFs.

The journal of physical chemistry letters·2025
Same author

High Magnetoresistance Sensitivity and Anisotropic Magnetotransport Properties in the Chiral Helimagnet Cr<sub>1/3</sub>NbS<sub>2</sub>.

The journal of physical chemistry letters·2025

Related Experiment Video

Updated: May 25, 2025

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
10:02

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions

Published on: May 27, 2021

3.9K

Exchange Coupling-Induced Spin Dynamic Damping Modulation at the Py/FeMn Interface.

Mingming Tian1, Qian Chen1, Wei Jiang1

  • 1Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing 211189, China.

ACS Applied Materials & Interfaces
|February 26, 2025
PubMed
Summary

Interfacial exchange coupling significantly enhances spin dynamic damping in nickel-iron (Py)/iron-manganese (FeMn) bilayers, crucial for spintronic devices. This effect, driven by exchange coupling, boosts damping more than spin pumping.

Keywords:
exchange coupling interfacemagneto-dynamicsspin dynamic dampingspin relaxationspintronics

More Related Videos

Spin Saturation Transfer Difference NMR SSTD NMR: A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes
11:44

Spin Saturation Transfer Difference NMR SSTD NMR: A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes

Published on: November 12, 2016

17.8K
High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
08:50

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

2.0K

Related Experiment Videos

Last Updated: May 25, 2025

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
10:02

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions

Published on: May 27, 2021

3.9K
Spin Saturation Transfer Difference NMR SSTD NMR: A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes
11:44

Spin Saturation Transfer Difference NMR SSTD NMR: A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes

Published on: November 12, 2016

17.8K
High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
08:50

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

2.0K

Area of Science:

  • Spintronics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Spin dynamic damping is critical for advanced magnetic memory, sensors, and logic systems.
  • Interfacial antiferromagnetic exchange coupling is a key phenomenon in spintronic heterostructures.

Purpose of the Study:

  • To investigate the magneto-dynamics of Ni80Fe20(Py)/Fe50Mn50(FeMn) bilayers.
  • To elucidate the role of interfacial exchange coupling versus spin pumping in spin dynamic damping.

Main Methods:

  • Systematic investigation of Py/FeMn bilayers with varying FeMn thicknesses.
  • Introduction of a Copper (Cu) spacer to decouple magnetic layers.
  • Analysis of spin dynamic damping and spin pumping effects.

Main Results:

  • An interfacial exchange bias field emerges for FeMn thickness > 5 nm, significantly increasing spin dynamic damping.
  • Introducing a Cu spacer suppresses exchange bias and reduces damping, with a minor increase attributed to spin pumping.
  • Estimated interfacial spin mixing conductance in Py/Cu/FeMn trilayers is 3.44 nm⁻², linked to FeMn's weak spin-orbit coupling.
  • FeMn insertion demonstrates a short spin diffusion length and confirms interfacial exchange coupling's dominant role in damping enhancement.

Conclusions:

  • Interfacial exchange coupling is the primary driver of enhanced spin dynamic damping in Py/FeMn bilayers, surpassing the spin pumping effect.
  • The exchange coupling at the Py/FeMn interface promotes spin relaxation and hinders spin transmission.
  • Integrating antiferromagnetic materials with exchange coupling interfaces offers a promising route to enhance high-frequency spintronic applications.