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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 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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Magnetic Field due to Moving Charges01:23

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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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Double Resonance Techniques: Overview01:12

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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...
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Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Updated: Sep 13, 2025

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Probing Ultrafast Magnetization Dynamics via Synthetic Axion Fields.

Leon Shaposhnikov1, Eduardo Barredo-Alamilla1, Frank Wilczek2,3,4,5

  • 1ITMO University, School of Physics and Engineering, Saint Petersburg 197101, Russia.

Physical Review Letters
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Summary
This summary is machine-generated.

High-frequency magnetization oscillations create a dynamic axion field. This field enables mapping of ultrafast magnetization dynamics with a lower-frequency probe signal, advancing metamaterial research.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Electromagnetism

Background:

  • Metamaterials leverage subwavelength spatial structuring for exotic properties.
  • Temporal modulation of material parameters offers advanced functionalities.
  • Understanding and controlling ultrafast magnetization dynamics is crucial for next-generation devices.

Purpose of the Study:

  • To investigate the generation of an effective dynamic axion field from high-frequency magnetization oscillations.
  • To demonstrate a method for mapping ultrafast magnetization dynamics using this generated field.
  • To explore novel functionalities in temporally modulated metamaterials.

Main Methods:

  • Inducing high-frequency oscillations in spatially uniform magnetization.
  • Generating an effective dynamic axion field that encodes oscillation amplitude and phase.
  • Utilizing a lower-frequency probe signal to interact with and detect the dynamic axion field.

Main Results:

  • Successfully generated an effective dynamic axion field through high-frequency magnetization oscillations.
  • Demonstrated that the generated axion field accurately embeds the amplitude and phase of the magnetization oscillations.
  • Established a technique to map ultrafast magnetization dynamics using a significantly lower-frequency probe signal.

Conclusions:

  • High-frequency magnetization oscillations provide a pathway to engineer dynamic axion fields.
  • This approach offers a novel, lower-frequency method for probing and understanding ultrafast magnetic phenomena.
  • The findings open new avenues for designing advanced, temporally modulated metamaterials with tailored electromagnetic responses.