Li-Zn-Cuフェライトを用いた積層コイルの複素インピーダンス・スペクトル

概要

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Multi-layer chip coils were fabricated by the green sheet technique using polycrystalline Li-Zn-Cu ferrite or Ni-Zn-Cu ferrite, and their complex impedance spectra were analyzed with the help of numerical calculation. When Ni-Zn-Cu ferrite is used, the complex impedance spectra of multi-layer chip coils are very sensitive to residual stress, and they deviate markedly from the values calculated by using complex permeability, permittivity, and the chip coil dimensions. On the other hand, it was found that the complex impedance of a multi-layer chip coil using Li-Zn-Cu ferrite may be determined from the complex permeability and permittivity of the polycrystalline Li-Zn-Cu ferrite as well as the chip coil dimensions. Consequently, the use of Li-Zn-Cu ferrite made it easy for us to design the complex impedance of a multi-layer chip coil. It is that the difference is related to the magnetostriction of polycrystalline ferrite. Hence, it was clarified that polycrystalline Li-Zn-Cu ferrite has a great advantage for multi-layer chip coil applications.
社団法人日本磁気学会の論文
2006-01-01