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Proceedings Paper

Metamaterials with tunable negative refractive index fabricated from nanoamorphous ferromagnetic microwires and Magnus optical effect
Author(s): A. Ivanov; A. Shalygin; V. Galkin; A. Vedyayev; K. Rozanov; V. Ivanov
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Paper Abstract

For inhomogeneous mediums the optical Magnus effect has been derived. The metamaterials fabricated from amorphous ferromagnet Co-Fe-Cr-B-Si microwires are shown to exhibit a negative refractive index for electromagnetic waves over wide scale of GHz frequencies. Optical properties and optical Magnus effect of such metamaterials are tunable by an external magnetic field. Microwave permeability of glass-coated ferromagnetic amorphous microwire exhibiting a weak negative magnetostriction has been studied. The diameter of the microwire was about 20 μm and the diameter of the metal core was about 12 μm. The microwire was wound to comprise a 7/3 washer-shaped composite sample with the volume fraction of magnetic constituent of about 10%. The permeability of the composite sample was measured in a coaxial line in the frequency range from 0.1 to 10 GHz. The composite was found to exhibit a negative permeability within the frequency range from approximately 0.7 to 1.5 GHz, with the permeability being as low as -0.4. Therefore, microwire-based composites, particularly, crossed arrays of microwires may be employed to develop metamaterials for microwave applications. In the composite, the negative microwave permeability is due to the natural ferromagnetic resonance and the negative microwave permittivity is due to the inherent inductance of the wire. Such metamaterials are advantageous in simple design, isotropic in-plane performance, and possible tunability of performance by external magnetic bias. However, for a feasible metamaterial fabricated from microwire arrays, the wires have to exhibit higher magnitude of the ferromagnetic resonance, higher quality factor, and higher resonance frequency.

Paper Details

Date Published: 4 September 2008
PDF: 6 pages
Proc. SPIE 7029, Metamaterials: Fundamentals and Applications, 70291H (4 September 2008); doi: 10.1117/12.793665
Show Author Affiliations
A. Ivanov, M.V. Lomonosov Moscow State Univ. (Russian Federation)
A. Shalygin, M.V. Lomonosov Moscow State Univ. (Russian Federation)
R&D VICHEL (Russian Federation)
V. Galkin, R&D VICHEL (Russian Federation)
A. Vedyayev, M.V. Lomonosov Moscow State Univ. (Russian Federation)
K. Rozanov, Joint Institute for High Temperatures (Russian Federation)
V. Ivanov, R&D VICHEL (Russian Federation)
N. S. Kurnakov Institute of General and Inorganic Chemistry (Russian Federation)

Published in SPIE Proceedings Vol. 7029:
Metamaterials: Fundamentals and Applications
Mikhail A. Noginov; Nikolay I. Zheludev; Allan D. Boardman; Nader Engheta, Editor(s)

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