Title :
M-hexaferrites with planar magnetic anisotropy and their application to high-frequency microwave absorbers
Author :
Cho, Han-Shin ; Kim, Sung-Soo
Author_Institution :
Dept. of Mater. Eng., Chungbuk Nat. Univ., Cheongju, South Korea
fDate :
9/1/1999 12:00:00 AM
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 anisotropy
Keywords :
coercive force; electromagnetic wave absorption; ferrite devices; ferrites; magnetic anisotropy; magnetic microwave devices; magnetic resonance; microwave materials; BaFeRuCoO; BaFeTiCoO; HF noise suppressors; M-hexaferrites; M-type barium ferrites; Ru-Co substituted specimens; Ti-Co substituted specimens; absorption loss; antireflection absorbers; ceramic processing technique; high-frequency microwave absorbers; magnetic properties; magnetic resonance frequency; microwave absorbing properties; planar magnetic anisotropy; reflection loss; saturation magnetization; sintered specimens; Anisotropic magnetoresistance; Barium; Ceramics; Coercive force; Ferrites; Magnetic anisotropy; Magnetic properties; Magnetic resonance; Perpendicular magnetic anisotropy; Saturation magnetization;
Journal_Title :
Magnetics, IEEE Transactions on
