Magnetic AC Impedance Analysis Method Using High-Tc SQUID Based Magnetic Measurement System

A new ac impedance analysis method that uses magnetic measurements was demonstrated. The magnetic field generated from the current flowing in the sample was detected by changing the frequency of the applied voltage. To detect the generated small magnetic field, a high-temperature superconductor supe...

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Bibliographic Details
Published inIEEE transactions on applied superconductivity Vol. 27; no. 4; pp. 1 - 5
Main Authors Sakai, Kenji, Kizu, Tsubasa, Kiwa, Toshihiko, Tsukada, Keiji
Format Journal Article
LanguageEnglish
Published New York IEEE 01.06.2017
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
AC impedance
Circuits
Current measurement
dye-sensitized solar cell
Dye-sensitized solar cells
Dyes
Equivalent circuits
Frequency measurement
Frequency ranges
High temperature superconductors
HTS-SQUID
Impedance
Impedance measurement
Magnetic field measurement
Magnetic fields
Magnetic measurement
Magnetism
Photovoltaic cells
Solar magnetic field
Superconducting quantum interference devices
Voltage measurement
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Summary:A new ac impedance analysis method that uses magnetic measurements was demonstrated. The magnetic field generated from the current flowing in the sample was detected by changing the frequency of the applied voltage. To detect the generated small magnetic field, a high-temperature superconductor superconducting quantum interference device (HTS-SQUID) based magnetic measurement system was developed. The developed system could detect the magnetic field without a change in the intensity and phase in the frequency range of 1 Hz to 10 kHz. In this frequency range, the spectrum correlated with the ac impedance of the electric circuit was obtained by measuring the magnetic field from the current in the circuit. Moreover, dye-sensitized solar cells with counter electrodes of different catalysis materials were prepared, and the magnetic field from the solar cell was measured. The Cole-Cole plot of the magnetic field correlated with the ac impedance measured by a conventional method, and the difference in the shape of Cole-Cole plot was explained using the equivalent circuit analysis of the dye-sensitized solar cell. Therefore, it was clarified that is possible to obtain the spectrum correlated with ac impedance using magnetic measurements.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2016.2631426