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

Ming Zhang, Yukio Nozaki, Kimihide Matsuyama

研究成果: Contribution to journalArticle査読

抄録

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.

本文言語英語
ページ(範囲)89-93
ページ数5
ジャーナルResearch Reports on Information Science and Electrical Engineering of Kyushu University
13
2
出版ステータス出版済み - 9 2008

All Science Journal Classification (ASJC) codes

  • コンピュータ サイエンス(全般)
  • 電子工学および電気工学

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