Title :
Magnetic anisotropy of chemically coprecipitated Zn2W ferrite
Author :
Sürig, C. ; Hempel, K.A.
Author_Institution :
Inst. fur Werkstoffe der Elektrotechnik, Univ. of Technology, Aachen, Germany
fDate :
3/1/1994 12:00:00 AM
Abstract :
BaZn2Fe16O27 is prepared by several modified coprecipitation methods and studied using differential thermal analysis, X-ray analysis, static magnetic measurements and ferromagnetic resonance absorption. At low annealing temperatures M- and W-type ferrite as well as monoferrite ZnFe2O4 crystallize depending on the coprecipitation method. In powders annealed below 1100°C single-domain hexaferrite phase with uniaxial anisotropy comparable to Zn2W ferrite mainly effects the microwave absorption loss. Ferromagnetic resonance is used to determine an effective anisotropy field strength of H´A=2K´1/μ0MS equal to 979 kA/m and K2/K´1=-0.03 leading to K2=-7.9 kJ/m3 for these powders
Keywords :
annealing; barium compounds; ferrites; ferromagnetic resonance; magnetic anisotropy; magnetic properties of fine particles; powders; precipitation; thermal analysis; zinc compounds; 1100 C; BaZn2Fe16O27; X-ray analysis; annealing; coprecipitation; differential thermal analysis; ferromagnetic resonance absorption; powders; uniaxial anisotropy; Anisotropic magnetoresistance; Annealing; Chemicals; Electromagnetic wave absorption; Ferrites; Magnetic analysis; Magnetic anisotropy; Magnetic resonance; Powders; Zinc;
Journal_Title :
Magnetics, IEEE Transactions on
