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

Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.2K
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.
1.2K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.9K
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...
1.9K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.4K
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...
1.4K
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

3.1K
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
3.1K
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

2.3K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
2.3K
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

1.1K
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...
1.1K

You might also read

Related Articles

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

Sort by
Same author

Asymmetric Spin Canting and Demagnetization Dynamics Driven by Laser Fields in Two-Dimensional Altermagnets.

Nano letters·2026
Same author

Laser-Induced Ultrafast Magnetic Phase Transition in 2D Van Der Waals Antiferromagnetic Heterostructures.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2026
Same author

Dual-Defect Donor-Acceptor Pairing in Metal Oxide Semiconductors for Enhanced CO<sub>2</sub> Photoreduction.

Nano letters·2025
Same author

Ultrafast Spin Dynamics in 2D Fully Compensated Ferrimagnets: A Time-Dependent Ab Initio Study.

The journal of physical chemistry letters·2025
Same author

Glue-assisted exfoliation of two-dimensional sulfur-rich niobium thiophosphate (Nb<sub>4</sub>P<sub>2</sub>S<sub>21</sub>) for sulfur-equivalent electrode study in lithium storage.

Nanoscale advances·2025
Same author

Ultrafast Laser-Induced Spin Dynamics in All-Semiconductor Ferromagnetic CrSBr-Phosphorene Heterostructures.

The journal of physical chemistry letters·2025

Related Experiment Video

Updated: Jan 14, 2026

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
09:00

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

Published on: June 28, 2018

10.4K

Ultrafast Spin Dynamics beyond s-Wave Magnets: A Universal Polarization Dependence.

Zhaobo Zhou1, Junjie He1

  • 1Faculty of Science, Charles University, Prague 12843, Czech Republic.

Nano Letters
|October 23, 2025
PubMed
Summary

Laser polarization controls ultrafast spin dynamics in magnetic materials. Altermagnets show unique sublattice-asymmetric demagnetization due to their nodal structures, unlike ferromagnets and antiferromagnets.

Keywords:
OISTRaltermagnetsreal-time TDDFTs-wave magnetsultrafast spin dynamics

More Related Videos

Study of Protein Dynamics via Neutron Spin Echo Spectroscopy
08:03

Study of Protein Dynamics via Neutron Spin Echo Spectroscopy

Published on: April 13, 2022

2.5K
Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate
11:57

Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate

Published on: September 13, 2019

7.0K

Related Experiment Videos

Last Updated: Jan 14, 2026

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
09:00

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

Published on: June 28, 2018

10.4K
Study of Protein Dynamics via Neutron Spin Echo Spectroscopy
08:03

Study of Protein Dynamics via Neutron Spin Echo Spectroscopy

Published on: April 13, 2022

2.5K
Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate
11:57

Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate

Published on: September 13, 2019

7.0K

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Ferromagnets (FMs), antiferromagnets (AFMs), and altermagnets (AMs) exhibit distinct Fermi surface properties and anisotropic electronic structures.
  • Ultrafast magnetization dynamics are driven by symmetry and hybridization, but the link to material-specific electronic structures remains underexplored.

Purpose of the Study:

  • Investigate laser-driven ultrafast spin dynamics in FMs, AFMs, and AMs.
  • Explore the influence of laser polarization and material electronic structure on spin dynamics.
  • Establish a connection between polarization-dependent spin responses and anisotropic electronic structures.

Main Methods:

  • Time-dependent density functional theory (TD-DFT) simulations.
  • Analysis of laser-driven ultrafast spin dynamics.
  • Investigation of varying laser polarization angles and incidence.
  • Development of a framework using band-path-resolved local density of states.

Main Results:

  • In FMs and AFMs, laser polarization controls the amplitude of anisotropic demagnetization.
  • AMs exhibit sublattice-asymmetric demagnetization sensitive to laser incidence, stemming from their nodal structures.
  • Optical-induced intersite spin transfer (OISTR) is governed by Fermi surface anisotropy and band dispersion.

Conclusions:

  • A direct link exists between polarization-dependent ultrafast spin responses and the anisotropic electronic structure of magnetic materials.
  • The study proposes a unified framework to understand anisotropic OISTR and its impact on spin dynamics.
  • Findings advance the understanding of ultrafast spin phenomena in magnetic systems.