| 摘要 |
PROBLEM TO BE SOLVED: To provide a ferrite magnet having high residual magnetic flux density and high coercive force which can not be achieved in a conventional M type ferrite magnet, by simultaneously improving the saturated magnetization and magnetic anisotropy of an M type ferrite, to provide a ferrite magnet having excellent magnetic characteristics that the temperature characteristics of the coercive force can be made extremely excellent, and especially, that the deterioration of the coercive force can be made small even in a low temperature, and to provide a ferrite magnet in which the rectangularity of a demagnetization curve can be made excellent, and that high characteristics can be obtained even when expensive Co contents are reduced, and the degree of orientation equivalent to that of a solvent system can be obtained even in a manufacturing process in a river system, and further to provide a motor and a magnetic recording medium having satisfactory characteristics. SOLUTION: This is magnet powder having the main phase of a hexagonal crystal system ferrite containing A (A is Sr, Ba, or Ca), Co and R [R indicates at least one kind of element selected from rare earth elements (containing Y) and Bi]. In this magnet powder, at least two different Curie temperatures are present in a range from 400 deg.C to 480 deg.C, and the absolute value of the difference is 5 deg.C or more. |
