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

Volume

26

Issue

3

fYear

1990

fDate

5/1/1990 12:00:00 AM

Firstpage

1144

Lastpage

1148

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.53989

Filename

53989