Recent Improvements of Ferrite Magnets

1 March 1997

journal article
Published by EDP Sciences in Journal de Physique IV

Vol. 07 (C1) , C1-299
https://doi.org/10.1051/jp4:19971118

Abstract

This paper overviews recent improvements in the properties of ferrite magnets from two viewpoints. First, new processes for submicron-sized particles, for high orientation and for high density were studied in detail. As a result, high performance Sr-ferrite magnets with Br=0.44T (4.4kG) and HcJ=320kA/m (4.0kOe) were developed. Furthermore, by means of SiO2-SrO or SiO2-BaO addition, high performance Ba-ferrite magnets with Br=0.43T (4.3kG), HcJ=290kA/m (3.6kOe) were obtained. At the same time, we discovered that it is possible to make equal the shrinkage ratio in the a- and c-axes. Second, (LiFe)Zn W-ferrite and Zn-substituted M-ferrite were investigated. Consequently, LaZn substituted SrM ferrite magnets were developed with extremely good properties, viz. Br=0.46T(4.6kG) and (BH)max=41kJ/m3(5.2MGOe)

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