DocumentCode :
969788
Title :
Effect of Fe2+content on the instability of coercivity of cobalt-substituted acicular iron oxides
Author :
Kishimoto, Mikio
Author_Institution :
Hitachi Maxell, Ltd., Kyoto, Japan
Volume :
15
Issue :
1
fYear :
1979
fDate :
1/1/1979 12:00:00 AM
Firstpage :
906
Lastpage :
908
Abstract :
The variation in coercivity was examined by annealing at 60°C cobalt-substituted acicular iron oxides with various Fe2+and cobalt contents. Except for samples containing less than 1 wt% Fe2+, the coercivity increased by the annealing at 60°C, and samples containing more Fe2+showed higher coercivity. The increase of coercivity was attributed to the magnetic anisotropy induced in cobalt-substituted acicular iron oxides, and the existence of Fe2+was considered to facilitate the migration of cobalt ions. The dependence of coercivity on Fe2+content was similar for the samples with 0.5, 1.0, 1.6, and 2.4 wt% cobalt. The coercivity of the samples containing 22-23 wt% Fe2+increased linearly with cobalt content. The coercivity of the samples containing less than 1 wt% Fe2+increased slightly with cobalt content.
Keywords :
Coercive forces; Magnetic tape recording materials; Annealing; Cobalt; Coercive force; Glass; Iron; Magnetic anisotropy; Magnetic materials; Magnetic recording; Shape; Temperature measurement;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1979.1060161
Filename :
1060161
Link To Document :
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