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Related Concept Videos

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...
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...
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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...
Diamagnetism01:26

Diamagnetism

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.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
Magnetic Fields01:27

Magnetic Fields

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.
A magnetic field is defined by the force that a charged particle experiences...
Maxwell's Equation Of Electromagnetism01:29

Maxwell's Equation Of Electromagnetism

James Clerk Maxwell (1831–1879) was one of the major contributors to physics in the nineteenth century. Although he died young, he made major contributions to the development of the kinetic theory of gases, to the understanding of color vision, and to understanding the nature of Saturn's rings. He is probably best known for having combined existing knowledge on the laws of electricity and magnetism with his insights into a complete overarching electromagnetic theory, which is represented by...

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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

Published on: June 28, 2024

Magnetoelastic metamaterials.

Mikhail Lapine, Ilya V Shadrivov, David A Powell

    Nature Materials
    |November 15, 2011
    PubMed
    Summary
    This summary is machine-generated.

    Advanced artificial electromagnetic materials, known as metamaterials, now feature magnetoelasticity. This couples electromagnetic and elastic interactions, enabling dynamic tuning of material properties for novel applications.

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    Area of Science:

    • Physics and Materials Science
    • Electromagnetism and Electrical Engineering

    Background:

    • Metamaterials initially aimed for negative refraction but expanded to diverse applications (microwaves, optics, acoustics).
    • Nonlinear metamaterials introduced tunable and active artificial materials, opening new research avenues.

    Discussion:

    • Introduces magnetoelastic metamaterials, integrating mechanical degrees of freedom.
    • Couples electromagnetic and elastic interactions within the metamaterial lattice.
    • Electromagnetically induced forces dynamically alter the metamaterial structure.

    Key Insights:

    • A novel nonlinear response arises from the mutual interaction of electromagnetic and elastic forces.
    • Enables dynamic tuning of effective material properties through structural changes.
    • Establishes a new class of tunable and active artificial materials.

    Outlook:

    • Paves the way for a new generation of intelligent metamaterials.
    • Draws parallels to fundamental concepts like optomechanics and magnetoelasticity.
    • Potential for advanced applications in tunable devices and adaptive systems.