NDLI: High-performance laminated thin-film shield with conductors and magnetic material multilayer

Content Provider	IEEE Xplore Digital Library
Author	Yamada, K. Ishida, M. Yutaka, S. Yamaguchi, M.
Copyright Year	2011
Description	Author affiliation: Corp. Manuf. Eng. Center, Toshiba Corp., Yokohama, Japan (Yamada, K.; Ishida, M.) \|\| Dept. of Electr. & Commun. Eng., Tohoku Univ., Sendai, Japan (Yutaka, S.; Yamaguchi, M.)
Abstract	This paper presents a laminated shield consisting of conductors and a magnetic material multilayer. The laminated shield provides a high shielding performance in an ultrahigh-frequency (UHF) band because the magnetic materials have high permeability and multi reflection occurs in the shield. Furthermore, the shielding performance is enhanced at the ferromagnetic resonance (FMR) frequency of the magnetic materials because the magnitude of complex permeability is maximized owing to the large imaginary part of permeability. We examined the shielding mechanisms of the laminated shield and a conductor shield by impedance calculation. The shielding performance obtained by impedance calculation coincides with that obtained by finite element method (FEM) simulation. The laminated shield is fabricated using a CoNbZr thin-film layer with a thickness of 0.2 μm and two Cu layers with a thickness of 0.4 μm. The measured shield effectiveness of the laminated thin-film shield is 27 dB higher than that of the conductor shield at a frequency of 470 MHz, which is similar to the results of impedance calculation and FEM simulation.
Sponsorship	IEEE Electromagn. Compatibility Soc.
Starting Page	432
Ending Page	437
File Size	493870
Page Count	6
File Format	PDF
ISBN	9781457708121
ISSN	21581118
e-ISBN	9781457708114
DOI	10.1109/ISEMC.2011.6038350
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-08-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic shielding Magnetic noise Perpendicular magnetic anisotropy Saturation magnetization Conductors Magnetomechanical effects
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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