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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

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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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Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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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.
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Types Of Superconductors01:28

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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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Diamagnetism01:26

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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.
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Magnetic Fields01:27

Magnetic Fields

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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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Low-dimensional magnetocaloric materials for energy-efficient magnetic refrigeration: does size matter?

Nguyen Thi My Duc1,2, Hariharan Srikanth1, Manh-Huong Phan1,3,4

  • 1Department of Physics, University of South Florida Tampa, FL, USA.

Science and Technology of Advanced Materials
|September 11, 2025
PubMed
Summary

Magnetocaloric materials offer efficient solid-state cooling. This review explores how reduced dimensionality and geometry impact the magnetocaloric effect (MCE) for advanced refrigeration.

Keywords:
Magnetocaloric materialsmagnetic refrigerationmicrowiresnanoparticlesreduced dimensionalityribbonsthin films

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Solid-State Physics

Background:

  • The magnetocaloric effect (MCE) is key for developing solid-state refrigeration, an alternative to conventional gas compression systems.
  • Current research prioritizes cost-effective magnetic materials with large MCEs under low magnetic fields for enhanced cooling efficiency.
  • Practical magnetic refrigeration necessitates efficient thermal management and scalable architectures, often using laminate designs or miniaturized geometries.

Purpose of the Study:

  • To address knowledge gaps regarding the influence of size, geometry, and interfacial effects on the MCE in reduced-dimensionality magnetocaloric materials.
  • To provide guidance for the rational design and engineering of magnetocaloric materials for high-performance, energy-efficient magnetic refrigeration.
  • To explore the advantages of nanostructured magnetocaloric materials, including improved heat exchange and mechanical flexibility.

Main Methods:

  • Review of existing literature on magnetocaloric materials and refrigeration.
  • Analysis of the impact of reduced dimensionality (ribbons, thin films, microwires, nanostructures) on MCE.
  • Investigation of interfacial effects, strain, and surface phenomena in magnetocaloric materials.

Main Results:

  • Magnetocaloric materials with reduced dimensionality offer improved heat exchange, mechanical flexibility, and integration potential for refrigeration devices.
  • Understanding the influence of size, geometry, and surface phenomena is crucial for optimizing MCE.
  • Miniaturized geometries and laminate designs are essential for practical magnetic refrigeration systems.

Conclusions:

  • Further research is needed to fully understand and leverage the MCE in reduced-dimensionality materials for advanced cooling technologies.
  • Rational design of magnetocaloric materials considering geometric and interfacial effects is critical for high-performance magnetic refrigeration.
  • Solid-state refrigeration based on MCE holds significant promise for energy-efficient cooling solutions.