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Related Concept Videos

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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

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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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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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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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Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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NMR Spectroscopy: Spin–Spin Coupling01:08

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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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Spin–Spin Coupling Constant: Overview01:08

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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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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Nonlinear Optics-Driven Spin Reorientation in Ferromagnetic Materials.

Qianqian Xue1, Yan Sun1, Jian Zhou1

  • 1Center for Alloy Innovation and Design, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.

ACS Nano
|August 22, 2024
PubMed
Summary
This summary is machine-generated.

Light irradiation can control magnetization dynamics in magnetic materials. This study proposes a theory explaining how light polarization and material symmetry enable ultrafast magnetization switching, crucial for quantum technologies.

Keywords:
first-principles calculationsnonlinear opticsorbitronicsphotomagnetizationspintronics

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Area of Science:

  • Condensed Matter Physics
  • Quantum Optics
  • Materials Science

Background:

  • Magnetization control is key for advanced technologies.
  • Ultrafast optical control of magnetism remains a challenge.
  • Understanding microscopic mechanisms of light-induced magnetization is crucial.

Purpose of the Study:

  • To propose a general theory for light-induced nonequilibrium magnetization dynamics.
  • To elucidate the microscopic mechanisms involving electronic band structure.
  • To demonstrate ultrafast magnetization switching via optical torque.

Main Methods:

  • Formulation of a band theory based on nonlinear optics.
  • Application of magnetic group theory and first-principles calculations.
  • Magnetic dynamic simulations to analyze switching timescales.

Main Results:

  • Light polarization and material symmetry dictate magnetization variation.
  • Circularly and linearly polarized light induce effective magnetic fields and torques.
  • Monolayer NiCl2 exhibits ultrafast out-of-plane magnetization switching (0.1-1 ns).

Conclusions:

  • Light irradiation can induce nonequilibrium steady state magnetization.
  • Quantum geometric and topological properties of Bloch functions are fundamental.
  • The proposed mechanism offers a pathway for ultrafast optical control of magnetism.