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Related Concept Videos

Magnetic Vector Potential01:15

Magnetic Vector Potential

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In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...
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Magnetism01:30

Magnetism

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Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
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Magnetic Moment of an Electron01:23

Magnetic Moment of an Electron

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Electrons revolving around a nucleus are analogous to a circular current carrying loop. This current produces a magnetic dipole moment proportional to the electron's orbital angular momentum. Since the orbital angular momentum is quantized in terms of the reduced Planck's constant, the dipole moment is quantized in the Bohr Magneton. The value of the Bohr magneton is 9.27 x 10-24 Am2. Electrons also have an intrinsic spin angular momentum, and the associated spin magnetic moment is...
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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Magnetic Field Lines01:19

Magnetic Field Lines

4.2K
The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
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Paramagnetism01:30

Paramagnetism

2.6K
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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Related Experiment Video

Updated: Aug 7, 2025

Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques
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All Fiber Vector Magnetometer Based on Nitrogen-Vacancy Center.

Man Zhao1, Qijing Lin1,2,3,4, Qingzhi Meng1

  • 1State Key Laboratory of Mechanical Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China.

Nanomaterials (Basel, Switzerland)
|March 11, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a portable, all-fiber magnetometer using nitrogen-vacancy (NV) centers in diamond for sensitive vector magnetic field detection. The novel fiber probe design enables μm-scale measurements, advancing applications in biology and physics.

Keywords:
fibermagnetometernitrogen-vacancy centersvector magnetic field

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Area of Science:

  • Quantum sensing
  • Materials science
  • Optics

Background:

  • Nitrogen-vacancy (NV) centers in diamond are promising for sensitive magnetic field measurements.
  • Conventional NV center magnetometers often rely on bulky optical components, limiting portability.

Purpose of the Study:

  • To develop a portable and flexible all-fiber vector magnetometer based on NV centers.
  • To achieve μm-scale vector magnetic field detection at the tip of a fiber probe.

Main Methods:

  • Utilized multi-mode fibers for simultaneous laser excitation and fluorescence collection of micro-diamond NV centers.
  • Developed an optical model to analyze fiber-optic interrogation of micro-diamonds.
  • Proposed a new analysis method combining micro-diamond morphology for vector magnetic field extraction.

Main Results:

  • Fabricated a portable all-fiber NV center vector magnetometer.
  • Achieved a magnetic field sensitivity of 0.73 nT/Hz1/2.
  • Demonstrated μm-scale vector magnetic field detection capability.

Conclusions:

  • The all-fiber design offers a robust, compact, and efficient approach for NV center magnetometry.
  • This technology enables magnetic endoscopy and remote magnetic measurements, broadening practical applications.