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Related Concept Videos

Magnetic Damping01:17

Magnetic Damping

531
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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Diamagnetism01:26

Diamagnetism

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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....
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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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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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Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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Updated: Aug 27, 2025

Fabrication and Characterization of Superconducting Resonators
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Diamagnetic Composites for High-Q Levitating Resonators.

Xianfeng Chen1, Satya K Ammu2, Kunal Masania2

  • 1Department of Precision and Microsystems Engineering, Delft University of Technology, Mekelweg 2, Delft, 2628 CD, The Netherlands.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|September 30, 2022
PubMed
Summary

Researchers developed novel diamagnetic composite resonators using graphite particles. These high-Q resonators offer extreme mechanical isolation and long vibration lifetimes at room temperature, paving the way for advanced accelerometers.

Keywords:
compositesdiamagnetic levitationeddy current dampingquality factor

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Area of Science:

  • Physics
  • Materials Science
  • Mechanical Engineering

Background:

  • Levitation provides superior mechanical isolation for precision systems.
  • Diamagnetic levitation is attractive due to room-temperature stability and no power requirement.
  • Eddy current dissipation in conventional materials limits diamagnetic levitation applications.

Purpose of the Study:

  • To develop high-Q macroscopic levitating resonators with reduced eddy current damping.
  • To investigate dissipation reduction mechanisms in graphite-based diamagnetic composites.
  • To enhance the quality factor (Q) of levitating resonators.

Main Methods:

  • Fabrication of diamagnetic composite resonators using graphite particles.
  • Levitation of resonators above permanent magnets in high vacuum at room temperature.
  • Tuning composite particle size and density to investigate dissipation reduction.

Main Results:

  • Achieved quality factors (Q) exceeding 450,000.
  • Demonstrated vibration lifetimes beyond one hour.
  • Composite resonators exhibited Q values over 400 times higher than diamagnetic graphite plates.

Conclusions:

  • Graphite particle-based diamagnetic composites significantly reduce eddy current damping.
  • The developed resonators offer ultra-sensitive room-temperature acceleration sensing capabilities.
  • These high-Q, large-mass resonators are promising for next-generation accelerometers.