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Related Concept Videos

Magnetic Damping01:17

Magnetic Damping

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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...
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Ferromagnetism01:31

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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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Related Experiment Video

Updated: Sep 20, 2025

Fabricating Metamaterials Using the Fiber Drawing Method
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Bioinspired, Rapidly Responsive Magnetically Tunable Stiffness Metamaterials.

Gooyoon Chung1, Huy Le Quang2,3, Jung Hyun Kim2,3

  • 1Department of Materials Science and Engineering, Kyung Hee University, Yongin, 17104, Republic of Korea.

Advanced Materials (Deerfield Beach, Fla.)
|May 27, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces magnetically tunable stiffness metamaterials (MTSM) with a bioinspired design for rapid and precise stiffness changes. These advanced materials offer a new foundation for adaptable programmable mechanical systems.

Keywords:
4D printingactive mechanical metamaterialsbioinspiredstimuli‐responsive materialsternary programmingtunable stiffness

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Biomimetics

Background:

  • Programmable mechanical materials need dynamic stiffness adaptability.
  • Existing solutions suffer from slow response times and limited precision.

Purpose of the Study:

  • Introduce magnetically tunable stiffness metamaterials (MTSM) with a bioinspired ternary programming framework.
  • Achieve rapid and precise stiffness modulation in programmable materials.

Main Methods:

  • Utilize direct ink writing, a 4D printing method.
  • Incorporate neodymium microparticles and a styrene-isoprene-styrene polymer matrix.
  • Employ a bioinspired ternary programming framework mimicking biological sarcomeres.

Main Results:

  • MTSM transitions between soft, moderate, and stiff states via magnetic torque-controlled structural deformation.
  • 3D MTSM arrays allow multi-layer stiffness adjustments under magnetic fields.
  • Achieved a 390% stiffness modulation range with rapid response to magnetic fields.

Conclusions:

  • Ternary programming in MTSM offers a novel approach for programmable mechanical systems.
  • MTSM demonstrates potential for next-generation adaptable materials with enhanced efficiency.
  • Bioinspired design overcomes limitations of current stiffness modulation technologies.