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Electromagnetic Noise Suppression Composite Sheets Made of Hexagonal Ferrite Particles

Sai, Ranajit and Sato, Mitsuharu and Miyazawa, Yasunori and Takahashi, Akihiro and Yamaguchi, Masahiro (2018) Electromagnetic Noise Suppression Composite Sheets Made of Hexagonal Ferrite Particles. In: IEEE TRANSACTIONS ON MAGNETICS, 54 (11).

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Official URL: http://dx.doi.org/10.1109/TMAG.2018.2849020


Three different compositions of hexagonal ferrites-M-type (SrCo1.4Ti1.4Fe9.2O19), Y-type (Ba2Zn2Fe12O22), and Z-type (Ba3Co1.25Zn0.75Fe24O41)-are studied to explore their suitability as an electromagnetic (EM) noise suppressor for 6 GHz band. The metal substitutions are chosen to achieve the largest possible noise suppression capabilities at the desired frequency. Static magnetic characterization reveals excellent soft magnetic properties of Z-type powder with M-S of 51 emu/g and H-C of just 8 Oe. However, the high-frequency properties of the Y-type sample are superior to the rest. It possesses the highest mu'(r) of 3.8 and noise suppression figure of merit omega x mu `' r (omega) of 23.8 GHz-more than 200% enhancement on the data previously reported by us at 6 GHz. Consequently, the ferrite-epoxy-based composite sheets comprised of 50 vol% of Y-type hexaferrite as magnetic inclusion exhibits the loss ratio, P-Loss/P-In, of 0.21, while the loss ratio of just 0.12 corresponds to more than 10 dB of EM noise suppression. An analytical model based on high frequency structure simulator is created to validate the measured loss ratio and to predict noise suppression capability of any given magnetic sheet.

Item Type: Journal Article
Additional Information: Copy right for this article belong to IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords: Ferromagnetic resonance (FMR); hexaferrite; noise suppression sheet; permeability
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 12 Nov 2018 15:42
Last Modified: 12 Nov 2018 15:42
URI: http://eprints.iisc.ac.in/id/eprint/61021

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