Process for producing cobalt-containing magnetic iron oxide powd

Details Process for producing cobalt-containing magnetic iron oxide powd Process for producing cobalt-containing magnetic iron oxide powd

1985-03-25

1986-06-10

Cooper, Jack

Coating processes

Magnetic base or coating

252 6256, 427130, 427131, C01G 4906

Patent

active

045942676

ABSTRACT:
A cobalt-containing magnetic iron oxide powder is provided by first coating a magnetic iron oxide base powder with a ferrous compound and then coating it with a cobalt compound. The cobalt-containing magnetic iron oxide powder provided is improved in stability of coercivity under aging and various other magnetic properties, and the magnetic tape produced by using the powder is also appreciably improved in stability of coercivity under aging as well as in various magnetic properties such as squareness, orientability and switching field distribution.

REFERENCES:
patent: 4296149 (1981-10-01), Rudolf et al.
patent: 4414245 (1983-11-01), Miyazawa et al.
"Switching Field Distribution and A.C. Bias Recording Parameters", by E. Koester et al, IEEE Transactions on Magnetics, vol. Mag. 17, No. 6 (Nov. 1981).
"Effect of Switching Field Distributions and Coercivity on Magnetic Recording Properties", by D. M. Wilson, IEEE Transactions on Magnetics, vol. Mag-11, No. 5 (Sep. 1975).
"Funtai Oyobi Funmatsu Yakin"(Powder and Powder Metallurgy) vol. 29, vol. 8, pp. 275-279, published Nov. 1982.

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