Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

3.4K
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...
3.4K
Paramagnetism01:30

Paramagnetism

3.2K
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...
3.2K
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

2.6K
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.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
2.6K
Magnetic Damping01:17

Magnetic Damping

1.2K
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
1.2K
Types Of Superconductors01:28

Types Of Superconductors

1.8K
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...
1.8K
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

1.7K
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...
1.7K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Paucisymptomatic opisthorchiasis in a non-endemic country: a neglected differential diagnosis?

Infection·2026
Same author

Eco-sustainable magnetoresistive sensors towards disposable magnetoelectronics.

Nature communications·2026
Same author

Nanocrystalline CoMnFeNiGa high entropy alloys: room temperature ferromagnetism bridging the gap from bulk to nano.

Faraday discussions·2025
Same author

Boosting Coercivity of 3D Printed Hard Magnets through Nano-Modification of the Powder Feedstock.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2024
Same author

Giant magnetocaloric effect in a rare-earth-free layered coordination polymer at liquid hydrogen temperatures.

Nature communications·2024
Same author

Table-top source for x-ray absorption spectroscopy with photon energies up to 350 eV.

The Review of scientific instruments·2024

Related Experiment Video

Updated: Mar 18, 2026

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
09:43

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

Published on: November 7, 2017

9.9K

Mastering hysteresis in magnetocaloric materials.

O Gutfleisch1, T Gottschall2, M Fries2

  • 1Materialwissenschaft, Technische Universität Darmstadt, Alarich-Weiss-Straße 16, 64287 Darmstadt, Germany gutfleisch@fm.tu-darmstadt.de.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|July 13, 2016
PubMed
Summary

Thermal hysteresis hinders magnetic refrigerator commercialization. This study explores hysteresis mechanisms and strategies to minimize losses in magnetocaloric materials like La-Fe-Si, Heusler, and Fe2P compounds for efficient magnetic cooling.

Keywords:
hysteresismagnetocaloricsmagnetostructural transition

More Related Videos

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
08:01

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

7.8K
Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
11:11

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

Published on: May 2, 2016

11.7K

Related Experiment Videos

Last Updated: Mar 18, 2026

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
09:43

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

Published on: November 7, 2017

9.9K
Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
08:01

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

7.8K
Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
11:11

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

Published on: May 2, 2016

11.7K

Area of Science:

  • Materials Science
  • Thermodynamics
  • Applied Physics

Background:

  • Hysteresis in materials with first-order transitions impedes magnetic refrigeration.
  • The efficiency of magnetic cooling devices relies on the reversibility of the magnetocaloric effect, which is sensitive to thermal hysteresis width.
  • Overcoming hysteresis is crucial for commercializing magnetic refrigerators.

Purpose of the Study:

  • To investigate the fundamental mechanisms causing thermal hysteresis in magnetocaloric materials.
  • To develop strategies for minimizing thermal hysteresis losses in magnetic cooling applications.
  • To analyze the potential of La-Fe-Si, Heusler, and Fe2P-type compounds as magnetic refrigerants.

Main Methods:

  • Review of fundamental aspects contributing to thermal hysteresis.
  • Development of strategies to mitigate hysteresis in selected magnetocaloric materials.
  • Focus on La-Fe-Si, Heusler, and Fe2P-type compounds.

Main Results:

  • Identified key factors contributing to thermal hysteresis in magnetocaloric materials.
  • Proposed strategies to reduce hysteresis losses, enhancing magnetic cooling efficiency.
  • Evaluated the suitability of specific material classes for magnetic refrigeration.

Conclusions:

  • Understanding and mitigating thermal hysteresis is essential for the practical application of magnetic cooling technology.
  • Strategies discussed offer pathways to improve the efficiency of magnetic refrigerators.
  • Selected magnetocaloric materials show promise for overcoming hysteresis challenges.