Patent ID: 6929758

Claim:
An oxide magnetic material including, as a main phase, a ferrite having a hexagonal M-type magnetoplumbite structure, the material comprising: A, which is at least one element selected from the group consisting of Sr, Ba, Pb and Ca; R, which is at least one element selected from the group consisting of the rare earth elements (including Y) and Bi and which always includes La; and Fe, wherein the ratio of the constituents A, R and Fe of the oxide magnetic material is represented by (1 −x )AO.( x /2)R 2 O 3 .n Fe 2 O 3 , Formula 1: where 0.05≦x≦0.35, and 5.0≦n≦6.7, and wherein either an oxide of Mn or oxides of Mn and Co is added at 0.3 wt % to 2.8 wt % to the oxide magnetic material.