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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...

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.

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...

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...

Magnetic Fields

Magnetic Fields

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.
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Magnetostatic Boundary Conditions

Magnetostatic Boundary Conditions

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Related Experiment Video

Updated: Jul 6, 2026

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

Ferroelectricity in an ising chain magnet.

Y J Choi¹, H T Yi, S Lee

¹Rutgers Center for Emergent Materials and Department of Physics & Astronomy, 136 Frelinghuysen Road, Piscataway, New Jersey 08854, USA.

Physical Review Letters

|March 21, 2008

Summary

We discovered collinear-magnetism-driven ferroelectricity in Ca3Co2-xMn(x)O6. This occurs due to a unique spin chain order breaking inversion symmetry and enabling charge order.

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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Published on: March 24, 2019

Area of Science:

Condensed Matter Physics
Materials Science
Magnetism and Ferroelectricity

Background:

Exploring novel multiferroic materials is crucial for advanced electronic applications.
Understanding the interplay between magnetic order and ferroelectric properties is a key research area.
Ising chain magnets offer unique platforms for studying low-dimensional magnetic phenomena.

Purpose of the Study:

To report the discovery of collinear-magnetism-driven ferroelectricity in Ca3Co2-xMn(x)O6.
To elucidate the mechanism behind ferroelectricity in this specific magnetic system.
To investigate the role of spin order and charge arrangement in symmetry breaking.

Main Methods:

Neutron diffraction was employed to determine the magnetic structure.
Analysis of spin ordering and charge distribution along the magnetic chains.
Investigation of symmetry breaking mechanisms, distinguishing from spiral magnetoelectrics.

Main Results:

Discovery of collinear-magnetism-driven ferroelectricity in Ca3Co2-xMn(x)O6 (x ≈ 0.96).
Observed an up-up-down-down magnetic order of alternating Co2+ and Mn4+ ions.
Ferroelectricity arises from inversion symmetry breaking due to alternating charge order in the spin chain.

Conclusions:

The study establishes a new route to ferroelectricity via collinear magnetism and symmetric superexchange.
Ca3(Co,Mn)2O6 serves as a model system for understanding exchange striction-driven ferroelectricity.
This finding expands the landscape of magnetoelectric materials and their underlying physical mechanisms.