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Related Concept Videos

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...
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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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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...
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Diamagnetism01:26

Diamagnetism

2.9K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.9K
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
Paramagnetism01:30

Paramagnetism

3.0K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Updated: Jan 17, 2026

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

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Spatial symmetry-broken atomic magnetometry.

Sanghyun Park, Min-Hwan Lee, Hyogi Kim

    Optics Express
    |September 23, 2025
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    Summary
    This summary is machine-generated.

    We developed a new atomic magnetic sensor using spatial symmetry-broken four-wave mixing. This sensitive magnetometer offers robust performance for applications like biomagnetic sensing and magnetic field mapping.

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    Area of Science:

    • Atomic physics
    • Quantum optics
    • Magnetometry

    Background:

    • Atomic magnetic sensors are crucial for various scientific and technological applications.
    • Existing sensors face limitations in sensitivity, bandwidth, or operating conditions.

    Purpose of the Study:

    • To report a novel atomic magnetic sensor leveraging spatial symmetry breaking (SSB) in a four-wave mixing (FWM) process.
    • To characterize the performance of this SSB magnetometer for weak magnetic field detection.

    Main Methods:

    • Utilized a rubidium vapor cell and counterpropagating polarization-selective FWM signals.
    • Exploited the spatial symmetry-broken properties induced by an external magnetic field.
    • Measured dispersive signals around zero magnetic field.

    Main Results:

    • Achieved a linear response in the range of -5 μT to 5 μT.
    • Demonstrated a magnetic sensitivity of approximately 10 pT/√Hz at 10 Hz.
    • Obtained a sensor bandwidth of 18.25 kHz.

    Conclusions:

    • The developed SSB magnetometer is a robust atomic magnetic sensor.
    • This technology holds potential for diverse applications including biomagnetic sensing and Earth's magnetic field mapping.