High sensitive detection of susceptibility modulation by LC resonator embedded with ferromagnetic multilayer

Ming Zhang, Yukio Nozaki, Kimihide Matsuyama

Research output: Contribution to journalArticlepeer-review


In the present study, high sensitive detection of the reversible susceptibility modulation in the magnetic thin film was performed by an LC circuit resonant technique. A flat pick-up coil with the inductance of 0.80 μH and a capacitance of 100 pF construct the LC resonant circuit. The reversible susceptibility χ of the magnetic thin film, embedded in the pick-up coil, was measured with a sinusoidal exciting field (H). The out put signal was modulated by applying an orthogonal bias field (Hb). A multilayer sample of [NiFe(100 nm)/Cu(10 nm)20 exhibits the most sensitive modulation effect among the fabricated samples. That is, the resonant frequency fr was decreased from 11.58 MHz (Hb = 0 Oe) to 8.22 MHz (Hb = 7 Oe) at Hex = 2.5 mOe, suggesting the marked increase of χ. The value of Hb, which minimizes f r, is comparable to the anisotropy field. Thus, the observed drastic increase of χ can be associated with the compensation of the anisotropy with Hb, as confirmed from the theoretical prediction. The practical out put voltage change of 55%/Oe was realized for the fabricated resonator.

Original languageEnglish
Pages (from-to)89-93
Number of pages5
JournalResearch Reports on Information Science and Electrical Engineering of Kyushu University
Issue number2
Publication statusPublished - 2008 Sept
Externally publishedYes


  • Induced magnetic anisotropy
  • LC resonance
  • Magnetic sensor
  • Magnetic thin film
  • Magneto-inductance
  • Susceptibility

ASJC Scopus subject areas

  • Computer Science(all)
  • Electrical and Electronic Engineering


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