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Diamagnetism

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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.
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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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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
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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...
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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.
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Magnetically tunable Mie resonance-based dielectric metamaterials.

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This study presents magnetically tunable dielectric metamaterials for tunable electromagnetic parameters. The novel design leverages Mie resonance and ferrite properties for advanced wireless communication and radar applications.

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Area of Science:

  • Materials Science
  • Electromagnetism
  • Metamaterials

Background:

  • Tunable electromagnetic materials are crucial for advanced wireless communication and radar systems.
  • Conventional materials and metamaterials face significant challenges in achieving tunable permeability and permittivity.
  • Metamaterials offer unique electromagnetic properties not found in natural materials.

Purpose of the Study:

  • To demonstrate a novel magnetically tunable dielectric metamaterial.
  • To explore the coupling of Mie resonance and ferromagnetic precession for tunable electromagnetic parameters.
  • To provide a new route for designing microwave devices with tunable electromagnetic properties.

Main Methods:

  • Fabrication and characterization of a metamaterial composed of dielectric cubes and ferrite cuboids.
  • Utilizing Mie resonance in dielectric components and ferromagnetic precession in ferrite components.
  • Applying an external magnetic field to tune the electromagnetic response.

Main Results:

  • The effective permeability and permittivity of the metamaterial were successfully tuned by adjusting the applied magnetic field.
  • Simulated and experimental results confirmed the magnetic tunability of the metamaterial.
  • Demonstrated coupling between Mie resonance and ferromagnetic precession leading to tunable properties.

Conclusions:

  • The proposed metamaterial design enables significant magnetic tunability of electromagnetic parameters.
  • This approach offers a promising pathway for developing next-generation microwave devices.
  • The metamaterial route provides a versatile platform for tailoring electromagnetic responses for specific applications.