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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...
2.4K

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Related Experiment Video

Updated: Jul 9, 2025

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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Colossal electrocaloric effect in an interface-augmented ferroelectric polymer.

Shanyu Zheng1, Feihong Du1, Lirong Zheng2

  • 1State Key Laboratory of Mechanical System and Vibration, Interdisciplinary Research Center, Institute of Refrigeration and Cryogenics, and MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

Science (New York, N.Y.)
|November 30, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel interface polarization strategy using organic crystal dimethylhexynediol to enhance the electrocaloric effect in polymers. This method achieves a giant conformational entropy and high entropy change under low electric fields.

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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Polymer Science

Background:

  • The electrocaloric effect requires maximizing polar domain degrees of freedom and minimizing polarization transition energy barriers.
  • Optimization of these factors in bulk ferroelectrics has reached inherent limitations.
  • Existing strategies struggle to overcome the trade-offs between domain size, crystallinity, and polar correlations.

Purpose of the Study:

  • To overcome the limitations of bulk ferroelectrics for enhanced electrocaloric effect.
  • To develop a new strategy for assembling polar conformations at heterogeneous interfaces.
  • To investigate the potential of interface engineering for giant conformational entropy and high entropy change.

Main Methods:

  • Utilized organic crystal dimethylhexynediol (DMHD) as a 3D sacrificial template.
  • Employed an epitaxy-like process via DMHD evaporation to assemble polar conformations.
  • Fabricated poly(vinylidene fluoride)-based terpolymer with an ultrafinely distributed, multiconformation-coexisting polar interface.

Main Results:

  • Achieved an ultrafinely distributed polar interface with giant conformational entropy.
  • Demonstrated a high entropy change of 100 J/(kg·K) under a low electric field.
  • The interface polarization strategy significantly enhanced the electrocaloric performance.

Conclusions:

  • The interface polarization strategy using a sacrificial organic crystal is effective in boosting electrocaloric performance.
  • This approach offers a generalizable method for enhancing dielectric materials.
  • The developed terpolymer shows promise for applications in dielectric capacitors and supercapacitors.