Spin-Sprayed Ferrite Films Highly Permeable in the GHz Range, with Excellent Heat Resistance(Selected Papers from the Third International Workshop on High Frequency Micromagnetic Devices and Materials (MMDM3))
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概要
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Previously we revealed that spin-sprayed ferrite films are usable for GHz-range noise suppressors. For actual use, the films must retain excellent characteristics after the reflow soldering process. In this study, we investigated how changing the compositions of films influences their electric resistivity and the noise suppression effects obtained after annealing at 260℃. We plated 3-μm-thick ferrite films #1 (Ni_<0.2>Zn_<0.1>Fe_<2.7>O_4) and #2 (Ni_<0.4>Zn_<0.3>Fe_<2.3>O_4) onto polyimide sheets. The resistivity of film #1 decreased markedly, from 4×10^2Ωcm to 1×10^0Ωcm as a result of the annealing. On the other hand, film #2 exhibited a smaller decrease, from 6×10^4Ωcm to 2×10^4Ωcm. The reflection parameter S_<11> and transmission loss ΔP_<loss> measured on a microstrip line for film #1, especially below 1GHz, were increased by the annealing. This is unfavourable for use of film #1 in lowpass filters that are required to absorb noises only in the GHz range. On the other hand, S_<11> and ΔP_<loss> for film #2 were not significantly affected by the annealing. This film exhibited ΔP_<loss> of 40% at 10GHz. Moreover, the value of S_<11> for the film below 10GHz was sufficiently weak, less than -12dB. Thus, we succeeded in fabricating a GHz-range noise suppressor, with excellent heat resistance.
- 社団法人日本磁気学会の論文
- 2005-11-01
著者
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Abe M.
Department of Basic Science, Ishinomaki Senshu University
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SHIMADA Y.
Tohoku University
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Matsushita N.
Department of Medicine Kyoto University Faculty of Medicine
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Matsushita N.
Department Of Physical Electronics Tokyo Institute Of Technology
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Kondo K.
NEC Tokin Corporation
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Numata Y.
NEC Tokin Corporation
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Chiba T.
NEC Tokin Corporation
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Yamada S.
NEC Tokin Corporation
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Yoshida S.
NEC Tokin Corporation
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