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Related Concept Videos

Ferromagnetism01:31

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...
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.
Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
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...
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.

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Related Experiment Video

Updated: Jul 17, 2026

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
07:03

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

Multiferroics: a magnetic twist for ferroelectricity.

Sang-Wook Cheong1, Maxim Mostovoy

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

Nature Materials
|January 3, 2007
PubMed
Summary

Researchers discovered magnetic ferroelectricity in frustrated magnets, enabling electric polarization in magnetic states. This breakthrough offers highly sensitive, tuneable multifunctional devices with potential applications in advanced technologies.

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Magnetic Tweezers for the Measurement of Twist and Torque
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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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Magnetic Tweezers for the Measurement of Twist and Torque
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Magnetic Tweezers for the Measurement of Twist and Torque

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Magnetism and ferroelectricity are key technological phenomena.
  • Multiferroic materials, coupling these properties, are of significant interest.
  • Coexisting magnetism and ferroelectricity often exhibit weak interactions.

Purpose of the Study:

  • To explore the phenomenon of magnetic ferroelectricity.
  • To understand the cross-coupling effects in multiferroic materials.
  • To investigate the role of frustrated magnets in achieving these properties.

Main Methods:

  • Experimental findings summary
  • Theoretical understanding synthesis

Main Results:

  • Discovery of magnetic ferroelectricity in frustrated magnets.
  • Observation of electric polarization induced in magnetically ordered states.
  • Demonstration of unprecedented sensitivity to applied magnetic fields.

Conclusions:

  • Magnetic ferroelectricity arises from competing spin interactions in frustrated magnets.
  • This phenomenon enables spectacular cross-coupling effects.
  • Potential for developing tuneable multifunctional devices.