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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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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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Paramagnetism01:30

Paramagnetism

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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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Colors and Magnetism03:02

Colors and Magnetism

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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...
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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Diamagnetism01:26

Diamagnetism

2.8K
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....
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Related Experiment Video

Updated: Dec 7, 2025

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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A three-order-parameter bistable magnetoelectric multiferroic metal.

Andrea Urru1,2, Francesco Ricci3, Alessio Filippetti1,4

  • 1Dipartimento di Fisica, Università di Cagliari, Cittadella Universitaria, Monserrato, I-09042, Cagliari, Italy.

Nature Communications
|October 2, 2020
PubMed
Summary
This summary is machine-generated.

Researchers predict Bi5Mn5O17 is a room-temperature multiferroic material. This single-phase material exhibits ferromagnetism, ferroelectricity, and ferrotoroidicity, offering potential for advanced electronic applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Multiferroic materials exhibiting simultaneous ferroelectric and ferromagnetic properties are highly sought after for technological applications.
  • Achieving single-phase multiferroics with strong coupling between primary order parameters, especially at room temperature, remains a significant challenge.

Purpose of the Study:

  • To computationally predict a novel single-phase multiferroic material.
  • To investigate the potential of layered-perovskite bismuth manganite (Bi5Mn5O17) as a room-temperature multiferroic.

Main Methods:

  • First-principles calculations were employed to investigate the structural, magnetic, and ferroelectric properties of Bi5Mn5O17.
  • Analysis focused on identifying ground states, order parameters, and their coupling.

Main Results:

  • First-principles calculations predict Bi5Mn5O17 to be a single-phase multiferroic exhibiting ferromagnetism, ferroelectricity, and ferrotoroidicity.
  • The material possesses two nearly energy-degenerate ground states with mutually orthogonal order parameters.
  • Giant magnetoelectric and magnetotoroidic effects, along with optical non-reciprocity, are anticipated due to strong coupling.

Conclusions:

  • Bi5Mn5O17 is a promising candidate for a room-temperature single-phase multiferroic.
  • The predicted material is thermodynamically stable under oxygen-rich conditions, suggesting experimental accessibility.
  • The unique properties of Bi5Mn5O17 could enable novel applications in magnetoelectric devices and optical non-reciprocity.