Permeability measurement up to 30 ghz of a magnetically isotropic thin film using a short-circuited coaxial line

S. Takeda, H. Kijima-Aoki, H. Masumoto, H. Suzuki

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


In this study, the high frequency permeability (µ) and ferromagnetic resonance(FMR) phenomena of a thin film with a strong perpendicular magnetic anisotropy and in-plane magnetically isotropic properties was measured using the short-circuited coaxial line technique; the analyzed sample had a toroidal shape. A field method was used for the background correction, where a strong magnetic bias field was applied and removed. However, when using a short-circuited coaxial line, the µ =1 condition cannot be achieved beyond a few ten GHz frequencies, whereas ferromagnetic resonance (denoted as FMR2) occurred because of the insufficient bias field. This resonance was compensated using the Landau-Lifshitz-Gilbert (LLG) equation, and the net µ-f properties without the bias field (denoted as FMR1) up to 30 GHz successfully extracted. Finally, a good agreement between the experimental results and the calculations based on the assumption of a magnetic multi-domain structure in FMR1 was achieved.

Original languageEnglish
Pages (from-to)91-98
Number of pages8
JournalJournal of the Magnetics Society of Japan
Issue number5
Publication statusPublished - 2019


  • FMR
  • Ferromagnetic resonance
  • GHz band
  • LLG
  • Magnetic thin film
  • Permeability measurement
  • Perpendicular anisotropy
  • Short-circuited coaxial line
  • Wideband measurement

ASJC Scopus subject areas

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


Dive into the research topics of 'Permeability measurement up to 30 ghz of a magnetically isotropic thin film using a short-circuited coaxial line'. Together they form a unique fingerprint.

Cite this