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Magnetic Damping01:17

Magnetic Damping

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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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Potential Due to a Magnetized Object01:24

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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
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Motion Of A Charged Particle In A Magnetic Field01:22

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A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move perpendicular to it. If the field is in a vacuum, the magnetic field is the dominant factor determining the motion. Since the magnetic force is perpendicular to the direction of motion, a charged particle follows a curved path. The particle continues to follow this curved path until it forms a complete circle. Another way to look at this is that the...
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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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Subatomic Particles03:37

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Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller subatomic particles: protons, neutrons, and electrons. These three particles account for the mass and the charge of an atom.
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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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First Search for Ultralight Dark Matter Using a Magnetically Levitated Particle.

Dorian W P Amaral1, Dennis G Uitenbroek2, Tjerk H Oosterkamp2

  • 1Rice University, Department of Physics and Astronomy, MS-315, Houston, Texas 77005, USA.

Physical Review Letters
|July 31, 2025
PubMed
Summary

This study presents the first search for ultralight dark matter using a levitated particle, setting new limits on dark matter interactions. The POLONAISE experiment demonstrates a novel quantum sensing approach for dark matter detection.

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Area of Science:

  • Particle Physics
  • Astrophysics
  • Quantum Sensing

Background:

  • Dark matter remains a significant mystery in physics.
  • Ultralight dark matter candidates require novel detection strategies.
  • Quantum sensing offers unprecedented force sensitivity for particle detection.

Purpose of the Study:

  • To conduct the first search for ultralight dark matter using a magnetically levitated particle.
  • To establish limits on dark matter interactions with baryon-lepton number (B-L).
  • To introduce and validate the POLONAISE experiment for future dark matter searches.

Main Methods:

  • Utilizing a submillimeter permanent magnet levitated in a superconducting trap.
  • Achieving a force sensitivity of 0.2 fN/√Hz.
  • Searching for signals of ultralight dark matter interacting with the levitated mass.

Main Results:

  • No evidence for ultralight dark matter signal was found.
  • Derived stringent limits on dark matter coupled to B-L in the mass range (1.10360-1.10485)×10⁻¹³ eV/c².
  • Set a limit on the coupling strength: g_{B-L}≲2.98×10⁻²¹.

Conclusions:

  • The experiment demonstrates the potential of magnetically levitated particles as a novel quantum sensor for dark matter.
  • The POLONAISE experiment, with planned upgrades, will provide leading sensitivity across a wide mass range.
  • This work opens a new avenue for exploring ultralight dark matter candidates.