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Ferromagnetism

Ferromagnetism

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...

Paramagnetism

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...

Diamagnetism

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....

Colors and Magnetism

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...

Magnetic Susceptibility and Permeability

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...

Types Of Superconductors

Types Of Superconductors

A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...

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Related Experiment Video

Updated: Jan 10, 2026

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

Multiferroic and magnetoelectric materials.

W Eerenstein¹, N D Mathur, J F Scott

¹Department of Materials Science, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, UK.

|August 18, 2006

Summary

This summary is machine-generated.

Discover the fascinating world of multiferroic materials, where electrical polarization and magnetic properties coexist. Explore the magnetoelectric coupling phenomenon and its potential for future technologies.

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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

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Area of Science:

Condensed matter physics
Materials science

Background:

Ferroelectric crystals possess switchable electrical polarization via atomic displacements.
Ferromagnetic crystals display switchable magnetization through quantum exchange interactions.
Multiferroic materials exhibiting both properties are rare, but magnetoelectric coupling is more common.

Purpose of the Study:

To explore the phenomenon of magnetoelectric coupling in materials.
To understand the underlying mechanisms of ferroelectricity and ferromagnetism.
To investigate the potential of these materials for technological applications.

Main Methods:

Review of fundamental principles of ferroelectricity and ferromagnetism.
Analysis of existing literature on multiferroic materials and magnetoelectric coupling.
Discussion of historical research and recent advancements.

Main Results:

Magnetoelectric coupling, the interaction between magnetic and electrical properties, is a widespread phenomenon.
While true multiferroic materials are scarce, the principles of magnetoelectric coupling are broadly applicable.
Pioneering research from the mid-20th century laid the groundwork for current investigations.

Conclusions:

The study of magnetoelectric coupling is crucial for developing novel electronic devices.
Recent resurgence in research is driven by the promise of advanced technological applications.
Continued exploration of these materials holds significant potential for future innovations.