Ferrite composition and motor having the same

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The present invention provides a sintered ferrite magnet having excellent residual magnetic flux density (Br) and rectangularity ratio (Hk/HcJ) and a motor having the same. According to the present invention, the sintered ferrite magnet includes a main phase of M type Sr ferrite having a hexagonal crystal structure. An amount of Zn is 0.05 to 1.35 mass% in terms of ZnO. The sintered ferrite magnet does not substantially include a rare-earth element (R). The following Formula (1) is satisfied, wherein a total amount of Sr, Ba and Ca is M3 in terms of mol, a total amount of Fe, Co, Mn, Zn, Cr and Al is M4 in terms of mol, and an amount of Si is M5 in terms of mol : 0.5< -{M3-(M4/12)}/M5< -4.8.COPYRIGHT KIPO 2015