Characterization of grain boundary conductivity of spin-sprayed ferrites using scanning microwave microscope

J. Myers, T. Nicodemus, Y. Zhuang, T. Watanabe, N. Matsushita, Masahiro Yamaguchi

研究成果: Article査読

3 被引用数 (Scopus)

抄録

Grain boundary electrical conductivity of ferrite materials has been characterized using scanning microwave microscope. Structural, electrical, and magnetic properties of Fe 3 O 4 spin-sprayed thin films onto glass substrates for different length of growth times were investigated using a scanning microwave microscope, an atomic force microscope, a four-point probe measurement, and a made in house transmission line based magnetic permeameter. The real part of the magnetic permeability shows almost constant between 10 and 300MHz. As the Fe 3 O 4 film thickness increases, the grain size becomes larger, leading to a higher DC conductivity. However, the loss in the Fe 3 O 4 films at high frequency does not increase correspondingly. By measuring the reflection coefficient s 11 from the scanning microwave microscope, it turns out that the grain boundaries of the Fe 3 O 4 films exhibit higher electric conductivity than the grains, which contributes loss at radio frequencies. This result will provide guidance for further improvement of low loss ferrite materials for high frequency applications.

本文言語English
論文番号17A506
ジャーナルJournal of Applied Physics
115
17
DOI
出版ステータスPublished - 2014 5 7

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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