M-hexaferrites with planar magnetic anisotropy and their application to high-frequency microwave absorbers
Authors:
- Han-Shin ChoHCHan-Shin Cho
- 1 January 1999
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Magnetics
- Vol. 35 (5) , 3151-3153
Abstract
Magnetic and microwave absorbing properties have been investigated in the M-type barium ferrites (BaFe12-2xAxCox O19) with planar magnetic anisotropy. For the tetravalent A ions, Ti4+ and Ru4+ are chosen and the samples are prepared by a conventional ceramic processing technique. At the substitution ratio with in-plane anisotropy which is estimated from the minimum coercivity, the saturation magnetization of the Ru-Co substituted specimens were about twice as large as those of Ti-Co. This leads to higher magnetic resonance frequency, and thus a large absorption loss (in sintered specimens) and small reflection loss (in rubber composites) are predicted at the higher frequencies in the Ru-Co substituted specimens. High-frequency noise suppressors or anti-reflection absorbers can be proposed for use with M-hexaferrites with planar magnetic anisotropyKeywords
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