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Related Concept Videos

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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Sequence Networks of Rotating Machines01:24

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A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...
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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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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.
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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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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Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a charged particle moving with a certain velocity. The Lorentz force equation combines the force of the electric field and of the magnetic field on the moving charge. Maxwell's equations and the Lorentz force law together encompass all the laws of electricity and magnetism. The symmetry that Maxwell introduced into his mathematical framework may not be...
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Updated: Jul 31, 2025

Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
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Skyrmion-Excited Spin-Wave Fractal Networks.

Nan Tang1, W L N C Liyanage2, Sergio A Montoya3,4

  • 1Materials Science and Engineering Department, University of Tennessee, Knoxville, TN, 37996, USA.

Advanced Materials (Deerfield Beach, Fla.)
|May 4, 2023
PubMed
Summary
This summary is machine-generated.

Researchers discovered that magnetic skyrmions create a fractal spin-wave network during dynamic excitation. Small-angle neutron scattering revealed this novel structure, offering insights into skyrmion dynamics.

Keywords:
magnetic dynamicsskyrmionssmall-angle neutron scatteringspin waves

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Magnetic skyrmions are topologically protected quasiparticles with unique dynamic behaviors at microwave frequencies.
  • Dynamic excitation of skyrmions leads to spin wave ejection, forming a complex magnetic environment.
  • Ordered structures can emerge from spin wave interference due to defined length scales and lattice structures.

Purpose of the Study:

  • To investigate the spin wave structure and dynamics in hybrid magnetic skyrmions.
  • To capture the dynamic behavior of skyrmions using advanced scattering techniques.
  • To understand the nanoscale phenomena governing skyrmion interactions.

Main Methods:

  • Simultaneous ferromagnetic resonance and small-angle neutron scattering (SANS).
  • Analysis of diffraction patterns to probe spin wave interference.
  • Fitting scattering data using a mass fractal model.

Main Results:

  • A significant increase in low-angle scattering intensity was observed under resonance conditions.
  • The scattering pattern is consistent with a long-range fractal network formed by spin waves.
  • The fractal structure's fundamental units are constrained by the skyrmion lattice.

Conclusions:

  • A novel dynamic spin-wave fractal structure has been identified in magnetic skyrmions.
  • Small-angle neutron scattering is a powerful tool for probing high-speed magnetic dynamics.
  • The findings provide critical insights into the complex nanoscale dynamics of skyrmions.