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Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

847
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...
847
Paramagnetism01:30

Paramagnetism

3.1K
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...
3.1K
Diamagnetism01:26

Diamagnetism

3.1K
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....
3.1K
Ferromagnetism01:31

Ferromagnetism

3.3K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
3.3K
Magnetic Fields01:27

Magnetic Fields

7.6K
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
7.6K
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

2.6K
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
2.6K

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Related Experiment Video

Updated: Mar 6, 2026

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
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Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

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Atomic-Scale Magnetometry of Dynamic Magnetization.

J van Bree1, M E Flatté1

  • 1Department of Physics and Astronomy and Optical Science and Technology Center, University of Iowa, Iowa City, Iowa 52242, USA.

Physical Review Letters
|March 11, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a novel magnetometer using a probe's magnetic field to detect sample responses. This advancement enables sensitive magnetic measurements of paramagnetic and diamagnetic materials, improving imaging magnetometry.

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Area of Science:

  • Physics
  • Materials Science
  • Quantum Sensing

Background:

  • Scanning probe techniques have improved imaging magnetometer spatial resolution.
  • Current methods require samples with pre-existing magnetization, limiting applications.

Purpose of the Study:

  • To develop a novel magnetometer design that overcomes limitations of existing techniques.
  • To enable sensitive detection of magnetic responses from paramagnetic and diamagnetic materials.

Main Methods:

  • Proposing a magnetometer where the probe's magnetic field elicits a sample response that feeds back to the probe.
  • Utilizing a nitrogen-vacancy (NV-) spin center in diamond.
  • Employing coherent detection schemes for sensitive measurements.

Main Results:

  • The technique detects the magnetic response of paramagnetic and diamagnetic materials.
  • Achieved accuracy better than 0.1 Å for measuring magnetically dead layer thickness.
  • Demonstrated a reversed perturbation approach for magnetometry.

Conclusions:

  • The proposed magnetometer design expands the capabilities of magnetic sensing.
  • This method offers high accuracy for characterizing thin magnetic layers.
  • Enables new applications in materials science and quantum sensing.