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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.
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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: May 1, 2026

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

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Published on: December 27, 2012

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Tunable reflector with active magnetic metamaterials.

Tianwei Deng, Ruifeng Huang, Ming-Chun Tang

    Optics Express
    |March 26, 2014
    PubMed
    Summary

    Researchers developed an agile tunable reflector using active magnetic metamaterials. This device can switch between absorbing, reflecting, and amplifying electromagnetic waves via electrical control.

    Area of Science:

    • Electromagnetics
    • Materials Science
    • Metamaterials

    Background:

    • Metamaterials offer unique electromagnetic properties.
    • Tunable control of metamaterial function is crucial for advanced applications.
    • Integrating active elements enables dynamic electromagnetic response.

    Purpose of the Study:

    • To design and demonstrate a tunable reflector with agile performance.
    • To achieve switching between absorption, reflection, and gain functionalities.
    • To enable electrical tuning of the metamaterial's loss characteristics.

    Main Methods:

    • Fabrication of active magnetic metamaterials on a metallic surface.
    • Incorporation of active elements into metamaterial unit cells.
    • Utilizing DC control lines for electrical tuning.

    More Related Videos

    Fabricating Metamaterials Using the Fiber Drawing Method
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    Fabricating Metamaterials Using the Fiber Drawing Method

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    Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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    Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

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    Related Experiment Videos

    Last Updated: May 1, 2026

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    13:44

    Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

    Published on: December 27, 2012

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    Fabricating Metamaterials Using the Fiber Drawing Method
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    Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

    Published on: September 25, 2020

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    Main Results:

    • Demonstrated a tunable reflector with excellent agile performance.
    • Successfully switched reflector function among perfect absorber, perfect reflector, and gain reflector.
    • Achieved electrical tuning across positive, zero, and negative loss regimes.

    Conclusions:

    • Active magnetic metamaterials provide a viable platform for tunable electromagnetic devices.
    • The developed tunable reflector offers versatile functionalities for advanced applications.
    • Electrical control over loss is key to achieving diverse reflective properties.