Microwave properties of a high-temperature superconductor and ferromagnetic bilayer structure

C. J. Wu, Y. L. Chen

Research output: Contribution to journalArticle

7 Citations (Scopus)

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 two- fluid 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.

Original languageEnglish
Pages (from-to)433-445
Number of pages13
JournalProgress in Electromagnetics Research
Volume111
DOIs
Publication statusPublished - 2011 Jan 1

Fingerprint

High temperature superconductors
high temperature superconductors
Microwaves
microwaves
reactance
Substrates
Temperature
Transmission line theory
Surface resistance
Superconducting films
Ferromagnetic materials
impedance
two fluid models
thresholds
ferromagnetic materials
superconducting films
Film thickness
transmission lines
critical temperature
film thickness

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Microwave properties of a high-temperature superconductor and ferromagnetic bilayer structure. / Wu, C. J.; Chen, Y. L.

In: Progress in Electromagnetics Research, Vol. 111, 01.01.2011, p. 433-445.

Research output: Contribution to journalArticle

@article{d8aebd15a58a4560afb01f3bf5cccde6,
title = "Microwave properties of a high-temperature superconductor and ferromagnetic bilayer structure",
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 two- fluid 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.",
author = "Wu, {C. J.} and Chen, {Y. L.}",
year = "2011",
month = "1",
day = "1",
doi = "10.2528/PIER10111304",
language = "English",
volume = "111",
pages = "433--445",
journal = "Progress in Electromagnetics Research",
issn = "1070-4698",
publisher = "Electromagnetics Academy",

}

TY - JOUR

T1 - Microwave properties of a high-temperature superconductor and ferromagnetic bilayer structure

AU - Wu, C. J.

AU - Chen, Y. L.

PY - 2011/1/1

Y1 - 2011/1/1

N2 - 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 two- fluid 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.

AB - 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 two- fluid 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.

UR - http://www.scopus.com/inward/record.url?scp=78751522688&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=78751522688&partnerID=8YFLogxK

U2 - 10.2528/PIER10111304

DO - 10.2528/PIER10111304

M3 - Article

AN - SCOPUS:78751522688

VL - 111

SP - 433

EP - 445

JO - Progress in Electromagnetics Research

JF - Progress in Electromagnetics Research

SN - 1070-4698

ER -