Granular Thin Films with High RF Permeability

Yutaka Shimada; Masahiro Yamaguchi; Sigehiro Ohnuma; Tetsuo Itoh; Wei Dong Li; Sinji Ikeda; Ki Hyeon Kim; H. Nagura

doi:10.1109/TMAG.2003.815892

Granular Thin Films with High RF Permeability

Yutaka Shimada, Masahiro Yamaguchi, Sigehiro Ohnuma, Tetsuo Itoh, Wei Dong Li, Sinji Ikeda, Ki Hyeon Kim, H. Nagura

ENG - Electrical Engineering

Research output: Contribution to journal › Article

74 Citations (Scopus)

Abstract

Owing to high resistivity and high inplane uniaxial anisotropy, granular films are known to exhibit high permeability at radio frequencies. But this granular resistivity is not high enough to suppress eddy current when they are used at gigahertz frequencies. Recent developments to solve this problem are described. One is patterning the granular films. It is effective to control the inplane anisotropy and to suppress inplane eddy current. Another is deposition of granular films by evaporation. A peculiar fiber structure is formed for which very high resistivity and anisotropy are realized. Finally, a study of using these films as near-field electromagnetic noise absorbers is described, and it is demonstrated that they have high potential as micrometer-scale noise absorbing elements in the gigahertz frequency range.

Original language	English
Pages (from-to)	3052-3056
Number of pages	5
Journal	IEEE Transactions on Magnetics
Volume	39
Issue number	5 II
DOIs	https://doi.org/10.1109/TMAG.2003.815892
Publication status	Published - 2003 Sep 1

Keywords

EMC
Granular films
Patterned film
Permeability

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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Shimada, Y., Yamaguchi, M., Ohnuma, S., Itoh, T., Li, W. D., Ikeda, S., Kim, K. H., & Nagura, H. (2003). Granular Thin Films with High RF Permeability. IEEE Transactions on Magnetics, 39(5 II), 3052-3056. https://doi.org/10.1109/TMAG.2003.815892

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abstract = "Owing to high resistivity and high inplane uniaxial anisotropy, granular films are known to exhibit high permeability at radio frequencies. But this granular resistivity is not high enough to suppress eddy current when they are used at gigahertz frequencies. Recent developments to solve this problem are described. One is patterning the granular films. It is effective to control the inplane anisotropy and to suppress inplane eddy current. Another is deposition of granular films by evaporation. A peculiar fiber structure is formed for which very high resistivity and anisotropy are realized. Finally, a study of using these films as near-field electromagnetic noise absorbers is described, and it is demonstrated that they have high potential as micrometer-scale noise absorbing elements in the gigahertz frequency range.",

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AU - Shimada, Yutaka

AU - Yamaguchi, Masahiro

AU - Ohnuma, Sigehiro

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AU - Li, Wei Dong

AU - Ikeda, Sinji

AU - Kim, Ki Hyeon

AU - Nagura, H.

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