@article{5272b47a6c6941f2a9536d9e388a32a9,
title = "Granular Thin Films with High RF Permeability",
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.",
keywords = "EMC, Granular films, Patterned film, Permeability",
author = "Yutaka Shimada and Masahiro Yamaguchi and Sigehiro Ohnuma and Tetsuo Itoh and Li, {Wei Dong} and Sinji Ikeda and Kim, {Ki Hyeon} and H. Nagura",
note = "Funding Information: Manuscript received January 7, 2003. This work was supported by the Telecommunication Advancement Organization (TAO) of Japan under the “Development of high performance electromagnetic wave absorber by nanoscale structure control of thin magnetic films” grant. Y. Shimada is with The Institute of Multidisciplinary Research for Adavanced Materials, Tohoku University, Sendai 980-857, Japan (e-mail: simayuta@tagen.tohoku.ac.jp). M. Yamaguchi, S. Ikeda, and K. H. Kim are with the Department of Electrical Engineering, Tohoku University, Sendai 980-8577, Japan. S. Ohnuma and H. Nagura are with the Research Institute for Electric and Magnetic Materials, Sendai 982-0807, Japan. T. Itoh and L. W. Dong are with NEC/TOKIN Company, Sendai, Japan. Digital Object Identifier 10.1109/TMAG.2003.815892 Fig. 1. Relations between the anisotropy field Hk and resistivity for various granular compositions. : Co Si Pd –O [8]. : Fe Al O ( = 300 cm, Fe Al O ( = 800 cm), Fe Al O ( = 1000 cm), Fe Al O ( = 2835 cm) [9]. : Fe (SiO ) ( = 290 cm), Fe (SiO2) ( = 16 150 cm) [10]. : Fe (Y O ) ( = 210 cm), Fe (Y O ) ( = 400 cm), Fe (Y O ) ( = 1200 cm) [11]. : Fe (Sm O ) = 180 cm), Fe (Sm O ) = 1800 cm) [11]. : Co O ( = 1500 cm), Co Zr ( = 4000 cm) [5]. : Co O [2].",
year = "2003",
month = sep,
doi = "10.1109/TMAG.2003.815892",
language = "English",
volume = "39",
pages = "3052--3056",
journal = "IEEE Transactions on Magnetics",
issn = "0018-9464",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "5 II",
}