永久磁石材料の電磁波吸収体への応用

DOI Web Site 被引用文献1件 参考文献22件
  • 杉本 諭
    東北大学大学院工学研究科 知能デバイス材料学専攻
  • 籠谷 登志夫
    東北大学大学院工学研究科 知能デバイス材料学専攻
  • 前田 徹
    住友電気工業（株）アドバンストマテリアル研究所ナノマテリアル研究部

書誌事項

タイトル別名
  • Application of Permanent Magnet Materials to Microwave Absorbers
  • 協会賞受賞記念講演:平成16年度研究進歩賞 永久磁石材料の電磁波吸収体への応用
  • キョウカイショウ ジュショウ キネン コウエン ヘイセイ 16ネンド ケンキュウ シンポショウ エイキュウ ジシャク ザイリョウ ノ デンジハ キュウシュウタイ エ ノ オウヨウ

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抄録

Recently, the use of microwaves in the GHz range has increased because of the demand for large data transmission. However, the problem of electromagnetic interference (EMI) has become serious, and much attention has been paid to microwave absorption materials. We have investigated magnetic loss of permanent magnet materials at natural resonance frequency, and have succeeded in the development of microwave absorbers using M-type (or W-type ferrite) and RE-Fe-B (RE: rare earth) compounds. The resonance frequency can be controlled by substitution of Fe3+ ion with other metal ion in the M-type or W-type ferrite. The resin composite of M-type ferrite shows wide bandwidth, in which the reflection loss (R.L.) is less than −20 dB. In the RE-Fe-B compounds, the substitution of RE with Sm or the fabrication of nanocomposite with a soft magnetic phase is effective method for controlling their resonance phenomena and functional frequency as microwave absorbers. The powder with fine α-Fe structure, which is produced by the disproportionation reaction of RE-Fe compounds, is useful for the filler of resin composite microwave absorbers in several GHz range.

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