Title :
Magnetic properties of anisotropic Sr-La system ferrite magnets
Author :
Yamamoto, Hiroshi ; Nagakura, Mitsuru ; Terada, Hiroshi
Author_Institution :
Sch. of Sci. & Technol., Meiji Univ., Kawasaki, Japan
fDate :
5/1/1990 12:00:00 AM
Abstract :
An experiment was carried out to investigate the effect of La2O3 on the magnetic and physical properties of strontium ferrite magnets. It was found that the La2O3 addition to SrO-6Fe2O3 (stoichiometric composition) was very useful in stabilizing the magnetoplumbite structure and that these ferrites of the Sr-La system had excellent permanent-magnet properties. Various compositions were tested, and the optimum conditions for making magnets and some properties of typical specimens were determined. The semisintering condition was 1250°C for 1 h in oxygen, and the sintering condition 1300°C for 0.5 h in oxygen. Magnetic and physical properties are presented and discussed. The [(SrO)0.143(Fe2O3)0.857]98 (La2O3)2 compound magnet exhibited the highest value of (BH)max, and this value was equivalent to or higher than that of ordinary Ba and Sr ferrites
Keywords :
ferrites; iron compounds; lanthanum compounds; magnetic anisotropy; permanent magnets; strontium compounds; 0.5 h; 1 h; 1250 degC; 1300 degC; SrO-Fe2O3-La2O3; anisotropic; ferrite magnets; magnetoplumbite structure; permanent-magnet; semisintering condition; Anisotropic magnetoresistance; Chemical analysis; Ferrites; Magnetic anisotropy; Magnetic properties; Magnets; Milling; Perpendicular magnetic anisotropy; Powders; Raw materials;
Journal_Title :
Magnetics, IEEE Transactions on
