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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...
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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...
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 Damping01:17

Magnetic Damping

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Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials
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Magnetically tunable negative permeability metamaterial composed by split ring resonators and ferrite rods.

Lei Kang1, Qian Zhao, Hongjie Zhao

  • 1State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China. zhouji@mail.tsinghua.edu.cn

Optics Express
|June 12, 2008
PubMed
Summary

This study demonstrates a tunable negative permeability metamaterial (NPM) using yttrium iron garnet (YIG) rods. The metamaterial

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Area of Science:

  • Metamaterials
  • Microwave Engineering
  • Condensed Matter Physics

Background:

  • Metamaterials offer unique electromagnetic properties not found in natural materials.
  • Tunable metamaterials are crucial for advanced applications in microwave and terahertz frequencies.
  • Traditional tuning methods often rely on electrical control of capacitance.

Purpose of the Study:

  • To experimentally demonstrate a novel tunable negative permeability metamaterial (NPM).
  • To investigate magnetic tuning of inductance via ambient effective permeability in metamaterials.
  • To characterize the tunability and reversibility of the NPM's response.

Main Methods:

  • Integration of yttrium iron garnet (YIG) rods into a periodic array of split ring resonators (SRRs).
  • Application of external magnetic fields ranging from 0 to 6000 Oe.
  • Measurement of resonance frequencies and negative permeability bandwidths at microwave frequencies.

Main Results:

  • Achieved continuous and reversible tuning of resonance frequencies by approximately 350 MHz (blueshift) and 315 MHz (redshift) with applied magnetic fields.
  • Extended the tunable negative permeability bandwidth by 360 MHz and 200 MHz compared to the metamaterial without YIG rods.
  • Demonstrated magnetic tuning of inductance as the primary mechanism for frequency control.

Conclusions:

  • The proposed YIG-based metamaterial provides a viable method for magnetically tuning negative permeability.
  • This approach offers continuous and reversible control over microwave frequencies.
  • The results pave the way for advanced tunable microwave devices and applications.