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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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...
Magnetic Damping01:17

Magnetic Damping

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...
Magnetic Flux01:18

Magnetic Flux

The magnetic flux measures the number of magnetic field lines passing through a given surface area. The SI unit for magnetic flux is the weber (Wb). Magnetic flux is a scalar quantity. It depends on three factors: the strength of the magnetic field B, the area through which the field lines pass, and the relative orientation of the field with the surface area.
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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...
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...

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Related Experiment Video

Updated: May 20, 2026

Magnet Assisted Composite Manufacturing: A Flexible New Technique for Achieving High Consolidation Pressure in Vacuum Bag/Lay-Up Processes
09:41

Magnet Assisted Composite Manufacturing: A Flexible New Technique for Achieving High Consolidation Pressure in Vacuum Bag/Lay-Up Processes

Published on: May 17, 2018

Morphing soft magnetic composites.

Vinh Quang Nguyen1, Anansa S Ahmed, Raju V Ramanujan

  • 1School of Materials Science and Engineering, Nanyang Technological University, Block N4.1, Nanyang Avenue, 639798, Singapore.

Advanced Materials (Deerfield Beach, Fla.)
|July 5, 2012
PubMed
Summary
This summary is machine-generated.

Magnet filler-polymer matrix composites (Magpol) offer unique morphing capabilities for applications like artificial muscles. These materials provide contactless actuation, high strain rates, and self-sensing, demonstrating significant potential in advanced material science.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Magnet filler-polymer matrix composites (Magpol) are an emerging class of morphing materials.
  • Potential applications include artificial muscles, drug delivery, adaptive optics, and self-healing structures.

Purpose of the Study:

  • To describe the actuation modes, dynamic properties, work output, and transduction characteristics of Magpol.
  • To present analogies between Magpol actuation and phase transformations.
  • To illustrate Magpol actuation with a proof-of-concept artificial muscle.

Main Methods:

  • Characterization of Magpol actuation modes.
  • Analysis of dynamic properties and work output.
  • Investigation of transduction characteristics.

Main Results:

  • Magpol exhibits advantages such as remote contactless actuation, multiple actuation modes, high actuation strain and strain rate, self-sensing, and quick response.
  • Analogies between Magpol actuation and phase transformations were established.
  • A proof-of-concept artificial muscle was successfully demonstrated.

Conclusions:

  • Magpol represents a promising class of morphing materials with diverse applications.
  • The unique properties of Magpol enable advanced functionalities in various fields.
  • Further research and development hold significant future prospects for Magpol technology.