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Related Concept Videos

Diamagnetism01:26

Diamagnetism

2.5K
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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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...
591
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

2.0K
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...
2.0K
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

365
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.
The vector...
365
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

745
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.
745
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

785
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...
785

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Angle Locking of a Levitating Diamond Using Spin Diamagnetism.

M Perdriat1, P Huillery1, C Pellet-Mary1

  • 1Laboratoire De Physique de l'École Normale Supérieure, École Normale Supérieure, PSL Research University, CNRS, Sorbonne Université, Université de Paris, 24 rue Lhomond, 75231 Paris Cedex 05, France.

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Researchers developed a new method using nanodiamonds with nitrogen-vacancy (NV) centers to improve magnetic field sensing and control particle orientation. This technique offers enhanced control over NV direction for advanced applications.

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Area of Science:

  • Quantum sensing
  • Materials science
  • Nanotechnology

Background:

  • Nanodiamonds with nitrogen-vacancy (NV) centers are promising for magnetic field sensing and biological hyperpolarization.
  • Current applications are limited by random environmental interactions and poor control of NV center orientation.

Purpose of the Study:

  • To predict and report a strong diamagnetism of pure spin origin in NV centers.
  • To demonstrate control over magnetic susceptibility sign and angle locking of microdiamond crystalline axis.

Main Methods:

  • Theoretical prediction of diamagnetism mediated by population inversion near a level crossing in the NV center electronic ground state.
  • Experimental demonstration of controlled magnetic susceptibility and crystalline axis alignment.

Main Results:

  • A strong diamagnetism of pure spin origin was observed and predicted.
  • Control over the sign of magnetic susceptibility was achieved.
  • Angle locking of the microdiamond crystalline axis along an external magnetic field was demonstrated.

Conclusions:

  • The study presents a novel approach to control NV center orientation in nanodiamonds.
  • This method enhances prospects for nanodiamond applications in quantum sensing and spin mechanics.
  • Demonstrated control over magnetic properties opens new avenues for advanced nanodiamond-based technologies.