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Grain‐size dependence of absorption characteristics of the electromagnetic wave absorbers of ferrite‐SiO 2 composites
Author(s) -
Kusunoki Hiroki,
Kondo Takatoshi,
Hiraki Kiyohiro,
Takada Kazushi,
Yoshikado Shinzo
Publication year - 2004
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.10269
Subject(s) - grain size , ferrite (magnet) , materials science , composite material , composite number
Grain‐size dependence of electromagnetic absorbing characteristics for composite materials made of Ni‐Zn ferrite and SiO 2 was investigated using SiO 2 with various grain sizes (29 µm, 30 nm, 12 nm, and 7 nm). The absorption characteristics of ferrite composites using SiO 2 with an average grain size of 30, 12, or 7 nm were improved compared with those of ferrite composites using SiO 2 with an average grain size of 29 µm in the low‐frequency region. Furthermore, the grain size dependence of the absorption characteristics for composite materials of Mn‐Zn ferrite with an average grain size of 130 nm and SiO 2 with an average grain size of 29 µm was investigated. The absorbing center frequency shifted to a higher frequency region than that of Mn‐Zn ferrite. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 146(4): 1–9, 2004; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10269