Permeability enhancement of soft magnetic films through metamaterial structures

Acher, O.

doi:10.1016/j.jmmm.2008.06.039

Cited by 13 publications

(9 citation statements)

References 27 publications

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“…The other limit is the damping effect in the precession of spins or in the displacement of magnetic domain walls. 7,8 The developments of metamaterials with inductive patterns have been comprehensively reviewed. 2 It is known that the metamaterial developed in recent years has many special and interesting properties.…”

Section: Introductionmentioning

confidence: 99%

Permeability and resonance characteristics of metamaterial constructed by a wire coil wound on a ferrite core

Huang

Kong

2009

Journal of Applied Physics

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Magnetically tunable double-negative material composed of ferrite-dielectric and metallic mesh J. Appl. Phys. 107, 093522 (2010); 10.1063/1.3359718 Determination of negative permeability and permittivity of metal strip coated ferrite disks using the transmission and reflection technique J. Appl. Phys. 107, 09A513 (2010); 10.1063/1.3357327Greatly enhanced azimuthal permeability of a ferrite core with a wire coil metamaterial

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Section: Introductionmentioning

confidence: 99%

Permeability and resonance characteristics of metamaterial constructed by a wire coil wound on a ferrite core

Huang

Kong

2009

Journal of Applied Physics

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“…The dielectric film and metal foil were then wrapped about the cavity concurrently to form the so-called 'wrapped tag', Figure 2(c). Wrapping in such a way makes a top layer of foil on the dielectric film (shown as dashed layer in Figure 2(a)) redundant once wrapped back onto itself, and so it was omitted to simplify the tag construction, yielding a structure similar to the metafilm described in reference [11]. The foil on either side of the dielectric film forms an extension of the cavity with large capacitance, while the first foil loop around the ferrite core has large inductance.…”

Section: Tag Details and Experimental Techniquementioning

confidence: 99%

A Ferrite-Filled Cavity Resonator for Electronic Article Surveillance on Metallic Packaging

et al. 2019

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Conventional electronic article surveillance (EAS) tags are ineffective on metallic packaging. The component of RF magnetic field perpendicular to the surface of the packaging induces eddy currents that suppress the magnetic flux linking the inductive element of the tag. In this work an inductive quarter-wavelength planar cavity, formed by wrapping aluminum foil around a ferrite core, was extended by wrapping additional capacitive layers of foil/dielectric around the ferrite-filled central region. This so-called 'wrapped tag' exhibits the frequency, Qfactor, and read distance characteristics of existing EAS tags, but is instead driven by RF magnetic fields parallel to the surface of the metallic packaging. In this article we compare the observed frequency response of the wrapped tag with a simple LC-resonator model that takes account of the tag's geometrical features, and use the model to describe how the design and construction of the tag can be optimized. Finite element method modeling is used to reveal how the current flows in the wrapped foil of the tag. Prototype tags show good reproducibility, demonstrating the potential of the design as a solution to the problem of tagging metallic packaging in the EAS industry.

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“…However this involves either micro-or nano-lithographic tools. Conventional deposition and patterning techniques commonly utilized in the silicon industry have been used to create metamaterials [125]. In 2003 H. O. Moser produced the first electromagnetic negative index metamaterials through microfabrication [126].…”

Section: Manufacturing Processesmentioning

confidence: 99%