| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technology effective for an improvement in the residual magnetic flux density (Br) and the coercive force (HcJ) of an La-Co containing M-type ferrite sintered magnet without increasing the content of Co. <P>SOLUTION: There is provided a ferrite magnetic material comprising a ferrite having a hexagonal structure as a main phase, which contains A, La, R, Fe and Co. A is at least one element selected from among Sr, Ba and Pb, and R is Pr and/or Nd. The component ratios of the total of the respective metallic elements A, La, R, Fe and Co in the main phase to the total amount of the metallic elements are A:1 to 13 atomic%, La:0.003 to 10 atomic%, R:0 to 10 atomic % (excluding 0), Fe:80 to 95 atomic%, and Co:0.05 to 5 atomic%. By including one or two kinds of Pr and Nd together with La and Co, the residual magnetic flux density (Br) and the coercive force (HcJ) can be improved without increasing the content of Co. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
