| 摘要 |
A sintered ferrite magnet having a basic composition represented by the general formula: A<SUB>1-x-y+a</SUB>Ca<SUB>x+b</SUB>R<SUB>y+c</SUB>Fe<SUB>2n-z</SUB>Co<SUB>z+d</SUB>O<SUB>19 </SUB>(atomic ratio), wherein a, b, c and d represent the amounts of an A element, Ca, an R element and Co added in the pulverization step of an oxide magnet material, which are numerals meeting the conditions of 0.03<=x<=0.4, 0.1<=y<=0.6, 0<=z<=0.4, 4<=n<=10, x+y<=1, 0.03<=x+b<=0.4, 0.1<=y+c<=0.6, 0.1<=z+d<=0.4, 0.50<=[(1-x-y+a)/(1-y+a+b)]<=0.97, 1.1<=(y+c)/(z+d)<=1.8, 1.0<=(y+c)/x<=20, and 0.1<=x/(z+d)<=1.2.
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