Analysis of AC Impedance in Localized Region Using Magnetic Field Distribution Measured by HTS-SQUID

Kenji Sakai, Tsubasa Kizu, Toshihiko Kiwa, Keiji Tsukada

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Estimation of AC impedance in localized region was investigated by measuring the magnetic field from an electrical current induced by applying AC voltage to a sample. For this measurement, a high-temperature superconductor superconducting quantum interference device (HTS-SQUID) was used to detect a magnetic field from a sample because the intensity of magnetic field is very small due to the small applied AC voltage to avoid a non-linear response. A dye-sensitized solar cell (DSSC) of which positive electrode consists of two catalysis materials was prepared. The magnetic field from the current generated inside the solar cell with two catalysis materials depended on the measurement position at which the catalysis material located under HTS-SQUID was different. This difference was correlated to the AC impedance change predicted by the measured EIS of DSSC. Moreover, the mapping obtained by magnetic field distribution near the interface of two catalysis materials showed a different magnetic field intensity and this was correlated to each catalysis material position. These results indicate that the analysis of localized AC impedance is possible using the magnetic field distribution generated from a sample.

Original languageEnglish
JournalIEEE Transactions on Applied Superconductivity
Publication statusAccepted/In press - Jan 22 2018


  • Current measurement
  • dye-sensitized solar cell
  • Electrodes
  • Impedance
  • localized AC impedance
  • magnetic field distribution
  • Magnetic field measurement
  • Magnetic fields
  • Photovoltaic cells
  • Voltage measurement

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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