Experimental verification of a tunable left-handed material by bias magnetic fields

Poo, Yin; Wu, Rui‐Xin; He, Guanghua; Chen, Pïng; Xu, Jie; Chen, Ri-feng

doi:10.1063/1.3409120

Cited by 28 publications

(15 citation statements)

References 19 publications

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“…Besides, the domain wall motion and gyromagnetic spin rotation may also contribute to the negative permeability behavior 16. Furthermore, the negative μ′ of Fe/Al 2 O 3 composites in the present work may also become tunable by applying an external DC magnetic field 14, 31, 32…”

Section: Resultsmentioning

confidence: 65%

Preparation of Iron Networks Hosted in Porous Alumina with Tunable Negative Permittivity and Permeability

Shi

Fan

Yan

et al. 2013

Adv Funct Materials

179

104

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Random composites of iron particles hosted in porous alumina were prepared from a facile impregnation‐reduction process. Interestingly, when the iron content exceeds the percolation threshold, the interconnection of iron particles results in the formation of iron networks. The composites then change from capacitive to inductive and the conductive mechanism changes from hopping conduction to metal‐like conduction. The negative permittivity was attributed to the plasma oscillation of delocalized electrons in iron networks, while the negative permeability could be ascribed to the strong diamagnetic response of current loops in iron networks. The negative permittivity behavior of the iron/alumina composite was analyzed using Drude model. Additionally, the fitting results indicated that the effective plasma frequency of the iron/alumina composite is much lower than bulk iron. Further investigations show that, the iron content and reduction temperature can easily tune the amplitude and frequency ranges of the negative permittivity and permeability. Moreover, the negative permittivity region and the negative permeability region can be pushed to the same frequency region by adjusting the iron content and reduction temperature. The impregnation‐reduction process opens a new way for the realization of tunable negative permittivity and permeability in random composites, and has great potential for the preparation of new types of double negative materials.

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Section: Resultsmentioning

confidence: 65%

Preparation of Iron Networks Hosted in Porous Alumina with Tunable Negative Permittivity and Permeability

Shi

Fan

Yan

et al. 2013

Adv Funct Materials

179

104

View full text Add to dashboard Cite

show abstract

“…If the response characteristics are dynamically tunable, these resonant devices will become more useful when adapting to different applications. To this end, many tunable metamaterial technologies have been demonstrated, based on changing unit cell's effective circuit parameters, [32][33][34][35][36] constituent material properties, [37][38][39][40][41][42] or geometries. [43][44][45][46][47][48][49] Specifically, the circuit tuning method uses variable capacitors and switches to change individual impedances of unit cells.…”

Section: Introductionmentioning

confidence: 99%

Tunable meta-atom using liquid metal embedded in stretchable polymer

et al. 2015

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Reconfigurable metamaterials have great potential to alleviate complications involved in using passive metamaterials to realize emerging electromagnetic functions, such as dynamical filtering, sensing, and cloaking. This paper presents a new type of tunable meta-atoms in the X-band frequency range (8-12 GHz) toward reconfigurable metamaterials. The meta-atom is made of all flexible materials compliant to the surface of an interaction object. It uses a liquid metal-based split-ring resonator as its core constituent embedded in a highly flexible elastomer. We demonstrate that simple mechanical stretching of the meta-atom can lead to the great flexibility in reconfiguring its resonance frequency continuously over more than 70% of the X-band frequency range. The presented meta-atom technique provides a simple approach to dynamically tune response characteristics of metamaterials over a broad frequency range. V

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“…In the vicinity of a ferromagnetic resonance (at microwave range), real part of permeability, μ' , can vary in a broad range (from positive to negative values depending on a particular material), while μ" demonstrates an absorption line [9,10]. The frequency of magnetic resonance can be controlled by external magnetic fields providing possibility of tuning.…”

Section: Introductionmentioning

confidence: 99%

“…The frequency of magnetic resonance can be controlled by external magnetic fields providing possibility of tuning. Feasibility of this approach to negative refraction index materials was shown in [10], based on bulk ferromagnetic materials. Composite structures filled with superparamagnetic nanoparticles can provide various advantages, including lesser eddy currents losses as well as easier fabrication routes [7].…”

Section: Introductionmentioning

confidence: 99%

Magnetic nanoparticles for tunable microwave metamaterials

et al. 2012

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Commonly, metamaterials are electrically engineered systems with optimized spatial arrangement of subwavelength sized metal and dielectric components. We explore alternative methods based on use of magnetic inclusions, such as magnetic nanoparticles, which can allow permeability of a composite to be tuned from negative to positive at the range of magnetic resonance. To better understand effects of particle size and magnetization dynamics, we performed electron magnetic resonance study on several varieties of magnetic nanoparticles and determined potential of nanoparticle use as building blocks for tunable microwave metamaterials.

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Experimental verification of a tunable left-handed material by bias magnetic fields

Cited by 28 publications

References 19 publications

Preparation of Iron Networks Hosted in Porous Alumina with Tunable Negative Permittivity and Permeability

Preparation of Iron Networks Hosted in Porous Alumina with Tunable Negative Permittivity and Permeability

Tunable meta-atom using liquid metal embedded in stretchable polymer

Magnetic nanoparticles for tunable microwave metamaterials

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