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Related Concept Videos

Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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...
MOS Capacitor01:25

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
Paramagnetism01:30

Paramagnetism

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...
Diamagnetism01:26

Diamagnetism

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.
Equivalent Capacitance01:19

Equivalent Capacitance

Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
The following strategies are adopted to calculate...

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Related Experiment Video

Updated: Jun 28, 2026

Magnet Assisted Composite Manufacturing: A Flexible New Technique for Achieving High Consolidation Pressure in Vacuum Bag/Lay-Up Processes
09:41

Magnet Assisted Composite Manufacturing: A Flexible New Technique for Achieving High Consolidation Pressure in Vacuum Bag/Lay-Up Processes

Published on: May 17, 2018

Magnetocapacitance in nonmagnetic composite media.

Meera M Parish1, Peter B Littlewood

  • 1Department of Physics, Princeton University, Princeton, NJ 08544, USA. mparish@princeton.edu

Physical Review Letters
|November 13, 2008
PubMed
Summary

Magnetism is not required for magnetocapacitance in inhomogeneous materials. A characteristic dielectric resonance, dependent on magnetic fields, may indicate material inhomogeneities, as seen in silicon and manganites.

Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Dielectric response in a magnetic field is a standard method to study coupled magnetic and elastic order in multiferroic materials.
  • Existing research often assumes magnetism is a prerequisite for observing magnetocapacitance.

Purpose of the Study:

  • To demonstrate that magnetocapacitance can occur in inhomogeneous materials even without magnetic ordering.
  • To identify a potential signature of material inhomogeneities detectable via dielectric measurements.

Main Methods:

  • Theoretical modeling of a two-dimensional, two-component composite medium.
  • Analysis of the dielectric response under varying magnetic fields.

Main Results:

  • A distinct dielectric resonance phenomenon was identified, which is dependent on the applied magnetic field.

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Magnet Assisted Composite Manufacturing: A Flexible New Technique for Achieving High Consolidation Pressure in Vacuum Bag/Lay-Up Processes
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Published on: May 17, 2018

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

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  • This resonance is shown to arise from material inhomogeneity, not magnetism.

    • Conclusions:

    • Magnetocapacitance in certain materials may be an artifact of inhomogeneity rather than true multiferroicity.
    • The observed dielectric resonance serves as a potential indicator of inhomogeneities in materials like nanoporous silicon and manganites.