TY - JOUR
T1 - Electromagnetic noise suppression composite sheets made of hexagonal ferrite particles
AU - Sai, Ranajit
AU - Sato, Mitsuharu
AU - Miyazawa, Yasunori
AU - Takahashi, Akihiro
AU - Yamaguchi, Masahiro
N1 - Funding Information:
ACKNOWLEDGMENT This work was supported in part by the Ministry of Internal Affairs and Communications, Japan, through the project Development of Technical Examination Services Concerning Frequency Crowding titled “Research and Development of the Electromagnetic Wave Environment Improvement Technology to Countermeasure Broader Bandwidth Unnecessary Radio Wave,” in part by DST-JSPS Joint Bilateral Research Project, and in part by the Cooperative Research Project Program of the RIEC, Tohoku University, under Grant H27-B05.
Publisher Copyright:
© 1965-2012 IEEE.
PY - 2018/11
Y1 - 2018/11
N2 - 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 MS of 51 eμg and HC of just 8 Oe. However, the high-frequency properties of the Y-type sample are superior to the rest. It possesses the highest μr ′ of 3.8 and noise suppression figure of merit ω × μr ′ ′ (ω) 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, PLoss/PIn, 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.
AB - 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 MS of 51 eμg and HC of just 8 Oe. However, the high-frequency properties of the Y-type sample are superior to the rest. It possesses the highest μr ′ of 3.8 and noise suppression figure of merit ω × μr ′ ′ (ω) 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, PLoss/PIn, 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.
KW - Ferromagnetic resonance (FMR)
KW - Hexaferrite
KW - Noise suppression sheet
KW - Permeability
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U2 - 10.1109/TMAG.2018.2849020
DO - 10.1109/TMAG.2018.2849020
M3 - Article
AN - SCOPUS:85050590162
SN - 0018-9464
VL - 54
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 11
M1 - 8418837
ER -