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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.4K
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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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
598
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Diamagnetism01:26

Diamagnetism

2.4K
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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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

909
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Updated: May 22, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Electromagnon Signatures of a Metastable Multiferroic State.

Blake S Dastrup1, Zhuquan Zhang1, Peter R Miedaner1

  • 1Massachusetts Institute of Technology, Department of Chemistry, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|March 14, 2025
PubMed
Summary

Researchers discovered a temporary multiferroic state in hexaferrite materials using terahertz spectroscopy. This metastable state, induced by magnetic fields, highlights the complex interplay between magnetoelectric coupling and thermal dynamics.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism and Dielectrics

Background:

  • Magnetoelectric multiferroic materials enable simultaneous control of magnetic and electric properties.
  • Type-II multiferroics exhibit ferroelectricity derived from magnetic order, presenting unique phenomena.
  • Stabilization mechanisms of multiferroic ground states against thermal fluctuations remain an open research question.

Purpose of the Study:

  • To investigate the emergence and stability of multiferroic states under external stimuli.
  • To explore the role of magnetoelectric coupling and thermal dynamics in multiferroicity.
  • To reveal spectroscopic signatures of field-induced metastable multiferroic phases.

Main Methods:

  • Utilized terahertz time-domain spectroscopy for high-resolution probing.
  • Applied external magnetic fields to induce phase transitions.
  • Employed photoexcitation and single-shot detection techniques for dynamic measurements.

Main Results:

  • Identified spectroscopic signatures of a magnetic-field-induced metastable multiferroic state in a hexaferrite.
  • Observed that this metastable state is robust against thermal influences up to a certain point.
  • Demonstrated the dynamic reversion of the metastable state to the paraelectric state due to thermal effects.

Conclusions:

  • Metastable multiferroicity can emerge and be spectroscopically identified in hexaferrites.
  • Thermal dynamics play a crucial role in the stability and eventual decay of these metastable states.
  • Findings provide insights into the fundamental mechanisms governing multiferroic ground states.