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Related Concept Videos

Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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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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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.
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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...
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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.
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From the study of resistive circuits, it is understood that employing a series-parallel combination serves as an effective strategy for simplifying circuits. Capacitors can be arranged within a circuit in one of two ways: a series configuration or a parallel configuration. The way these capacitors are connected to a battery will influence both the potential drop across each individual capacitor and the size of the charge that each capacitor can store. This is determined by the specific type of...
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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...
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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
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Magnetocapacitance without magnetism.

Meera M Parish1

  • 1London Centre for Nanotechnology, Gordon Street, London WC1H 0AH, UK.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|January 15, 2014
PubMed
Summary
This summary is machine-generated.

Magnetism is not required for magnetocapacitance in inhomogeneous materials. This study shows simple conductor-dielectric layers exhibit this effect, generalizing the Maxwell-Wagner effect.

Keywords:
Maxwell–Wagner effectcomposite mediamagnetodielectric effectmagnetotransport

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Electromagnetism

Background:

  • Substantial magnetodielectric effects are typically linked to coupled magnetic and elastic order in multiferroics.
  • Recent findings suggest magnetism is not essential for magnetoresistance or magnetocapacitance in inhomogeneous materials.

Purpose of the Study:

  • Investigate the magnetic-field-dependent dielectric response of inhomogeneous systems.
  • Demonstrate magnetocapacitance in simple conductor-dielectric composites.
  • Generalize the Maxwell-Wagner effect to finite magnetic fields.

Main Methods:

  • Exact calculations of conductor-dielectric composites.
  • Numerical simulations of inhomogeneous systems.
  • Analysis of magnetic-field-dependent dielectric response.

Main Results:

  • Simple conductor-dielectric layers exhibit magnetocapacitance.
  • Random bulk inhomogeneities are not a prerequisite for this effect.
  • The phenomenon observed is a generalization of the Maxwell-Wagner effect.

Conclusions:

  • Magnetocapacitance can arise in inhomogeneous materials without magnetism.
  • The Maxwell-Wagner effect can be extended to include magnetic fields.
  • Experimental observations of this phenomenon in certain materials are discussed.