Compositions – Magnetic – Iron-oxygen compound containing
Patent
1999-05-19
2000-07-11
Koslow, C. Melissa
Compositions
Magnetic
Iron-oxygen compound containing
252 6257, 252 6263, 264612, 264611, C04B 3540
Patent
active
060867817
ABSTRACT:
The magnetic powder and the sintered magnet of the invention contains a primary phase of a hexagonal ferrite containing A, Co or R wherein A represents Sr, Ba or Ca, and R represents at least one element which may be rare earth elements including Y, and Bi, and have at least two different Curie temperatures, wherein the two different Curie temperatures are present within a range of from 400 to 480.degree. C., and an absolute value of a difference therebetween is 5.degree. C. or more. As both the saturation magnetization and the magnetic anisotropy of the M type ferrite therein are increased, the magnetic powder and the wintered magnet have a high residual magnetic flux density and a high coercive force, which conventional M type ferrite magnets could not have, while having excellent temperature characteristics of coercive force.
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Hirata Fumihiko
Iida Kazumasa
Masuzawa Kiyoyuki
Minachi Yoshihiko
Sasaki Mitsuaki
Koslow C. Melissa
TDK Corporation
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