| abstract |
PROBLEM TO BE SOLVED: To develop and provide a magnetoplumbite type hexagonal ferrite exhibiting a property that when used for a radio wave absorber, the matching frequency hardly changes even if the thickness thereof is changed. SOLUTION: A composition formula AFe (12-X) (B1 0.5 B2 0.5 ) X O 19 , A is one or two of Ba and Sr, B1 is one of Ti and Zr Two types, B2, are divalent metal elements, and are achieved by a magnetoplumbite type hexagonal ferrite containing two or more of Co, Mn, Cu, Mg, Zn and Ni. B2 contains at least Zn, and particularly contains Co and Zn or Mn and Zn. [Selection figure] None |