Modeling of the microwave characteristics of layered superconductor/ferromagnetic structures

Nurgaliev, T.

doi:10.1016/j.physc.2008.04.001

Cited by 8 publications

(7 citation statements)

References 33 publications

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“…As seen in Figure 2 of [23], the measured normal conductivity σ 3 is a function of the temperature. According to this figure, at T < T c , σ 3 can be approximated as the following relation, i.e., On the other hand, the relative permeability of FM-LSMO is given by…”

Section: Basic Equationsmentioning

confidence: 88%

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Microwave Properties of a High-Temperature Superconductor and Ferromagnetic Bilayer Structure

Wu¹,

Chen²

2011

PIER

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Abstract-Microwave properties for a bilayer structure made of the high-temperature superconducting and the ferromagnetic materials are theoretically investigated. The properties are explored through the effective surface impedance calculated by using the enhanced twofluid model for high-temperature superconductors together with the transmission line theory. The calculated effective surface impedance will be numerically analyzed as a function of the frequency, the temperature, and the thicknesses of the constituent layers. It is found that, for a thinner superconducting film, the effective surface resistance is a strong function of the frequency, and the effective surface reactance exhibits a peak and a dip in the frequency-domain. In the study of the effect of thickness in ferromagnetic substrate, there is a peak frequency in the surface reactance for a thinner substrate. There is also a threshold thickness for the ferromagnetic substrate such that it behaves like a bulk substrate when its thickness is larger than this threshold value. In the temperature dependence of surface reactance, the peak near critical temperature is shifted to lower temperature and broadened as the film thickness decreases.

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Section: Basic Equationsmentioning

confidence: 88%

“…For LSMO, the saturation magnetization M is also a function of the temperature. The measured M can be seen in Figure 2 of [23]. Using this temperaturedependent plot in M , we can approximate it as the following relation,…”

Section: Basic Equationsmentioning

confidence: 99%

Microwave Properties of a High-Temperature Superconductor and Ferromagnetic Bilayer Structure

Wu¹,

Chen²

2011

PIER

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“…Experiments show that humans have a present lifetime of at minutest 100,000 years. The duration of a sustained current can become equal to the duration of universe, reliant on the wire architecture and temperature in superconductors [24]. In exercise, currents infused in superconductivity coils have lasted in superconducting gravimeters for even more than 26 years.…”

Section: Superconducting Materialsmentioning

confidence: 99%

“…Because of which, the power that the current conveys is constantly dispersed. This is the electrical resistance and Heat transfer phenomenon [24]. When the temperature T is dropped under a threshold temperature 𝑇𝑇 𝑐𝑐 , superconductivity features occur in superconducting elements.…”

Section: Superconducting Materialsmentioning

confidence: 99%

Superconducting Metamaterials and their Applications

Rizwan

2022

Superconductors

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Superconductors have been in the field for more than a century now and superconducting metamaterials are a class of materials that have extremely low losses. Superconducting materials exhibit supreme properties such as currents that can last for twenty-six years and quantum phenomenon that makes it very suitable for making metamaterials. Superconductor composites are materials in which a material with a substantial permeability and negative effective permittivity material is combined with a superconductor which reduce losses in metamaterials at resonance frequency. There are many angles to explore and investigate in superconducting metamaterials. Novel applications of superconducting metamaterials are also briefly deliberated

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“…However, the imaginary part of µ e f f is quite large near the resonance and limits the utility of such a metamaterial. A hybrid metamaterial, resulting from the combination of the gyromagnetic material mentioned earlier with a superconductor can help to reduce losses 138 . A superlattice consisting of high−T c superconducting and manganite ferromagnetic layers (YBCO/LSMO) was created and it was shown to produce a negative index band in the vicinity of the ferromagnetic resonance (∼ 90 GHz) at magnetic fields between 2.9 and 3.1 T 107 .…”

Section: Summary Of Earlier Work In Superconducting Metamaterialsmentioning

confidence: 99%

Superconducting metamaterials

Lazarides

Tsironis

2018

Physics Reports

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Metamaterials, i.e. artificial, man-made media designed to achieve properties not available in natural materials, have been the focus of intense research during the last two decades. Many properties have been discovered and multiple designs have been devised that lead to multiple conceptual and practical applications. Superconducting metamaterials made of superconducting metals have the advantage of ultra low losses, a highly desirable feature. The additional use of the celebrated Josephson effect and SQUID (superconducting quantum interference device) configurations enrich the domain of superconducting metamaterials and produce further specificity and functionality. SQUID-based metamaterials are both theoretically investigated but also fabricated and analyzed experimentally in many laboratories and exciting new phenomena have been found both in the classical and quantum realms. The enticing feature of a SQUID is that it is a unique nonlinear oscillator that can be actually manipulated through multiple external means. This domain flexibility is inherited to SQUID-based metamaterials and metasurfaces, i.e. extended units that contain a large arrangement of SQUIDs in various interaction configurations. Such a unit can be viewed theoretically as an assembly of weakly coupled nonlinear oscillators and as such presents a nonlinear dynamics laboratory where numerous, classical as well as quantum complex, spatio-temporal phenomena may be explored. In this review we focus primarily on SQUID-based superconducting metamaterials and present basic properties related to their individual and collective responses to external drives; the work summarized here is primarily theoretical and computational with nevertheless explicit presentation of recent experimental works. We start by showing how a SQUID-based system acts as a genuine metamaterial with right as well as left handed properties, demonstrate that the intrinsic Josephson nonlinearity leads to wide-band tunability, intrinsic nonlinear as well as flat band localization. We explore further exciting properties such as multistability and self-organization and the emergence of counter-intuitive chimera states of selective, partial organization. We then dwell into the truly quantum regime and explore the interaction of electromagnetic pulses with superconducting qubit units where the coupling between the two yields phenomena such as self-induced transparency and superradiance. We thus attempt to present the rich behavior of coupled superconducting units and point to their basic properties and practical utility. Abstract1 Contents 2 1. High-frequency magnetism, in particular, exhibited by magnetic metamaterials, is considered one of the "forbidden fruits" in the Tree of Knowledge that has been brought forth by metamaterial research 9 . Their unique properties allow them to form a material base for other functional devices with tuning and switching capabilities 9,10,11 . The scientific activity on metamaterials which has exploded since their first experimental demonstration 12,13...

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Modeling of the microwave characteristics of layered superconductor/ferromagnetic structures

Cited by 8 publications

References 33 publications

Microwave Properties of a High-Temperature Superconductor and Ferromagnetic Bilayer Structure

Microwave Properties of a High-Temperature Superconductor and Ferromagnetic Bilayer Structure

Superconducting Metamaterials and their Applications

Superconducting metamaterials

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