| 摘要 |
The present invention provides a ferrite magnetic material comprising as a main constituent a compound represented by a composition formula, AFe2 + a Fe 3+ b O 27 (wherein 1.1 ‰¤ a ‰¤ 2.4, 12.3 ‰¤ b ‰¤ 16.1; and A comprises at least one element selected from Sr, Ba and Pb), and also comprising as additives a Ca constituent in terms of CaCO 3 and a Si constituent in terms of SiO 2 so as to satisfy the relation CaCO 3 /SiO 2 = 0. 5 to 1.38 (molar ratio). By making the relation CaCO 3 /SiO 2 = 0.5 to 1.38 (molar ratio) be satisfied, the coercive force (HcJ) and the residual magnetic flux density (Br) can be made to simultaneously attain high levels. |
