Etchant for electrolytic etching of a ferrite for a magnetic hea

Details Etchant for electrolytic etching of a ferrite for a magnetic hea Etchant for electrolytic etching of a ferrite for a magnetic hea

1978-07-10

1979-09-25

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412975, 20412995, C25F 302, C25F 314

Patent

active

041690265

ABSTRACT:
An etchant comprising an electrolytic liquid which comprises sulfuric acid as a main component and water in such amount that the weight ratio of sulfuric acid to water is between 9:1 and 2:1. The ferrite surface having been electrolytically etched by using this etchant is smooth. Thus, this etchant makes it possible to etch a ferrite to a large depth, and thereby easily shape a ferrite by electrolytic etching, e.g. to define the track width of a magnetic head.

REFERENCES:
patent: 2645635 (1953-07-01), Walton
patent: 3342711 (1967-09-01), Shiga et al.
patent: 3485731 (1969-12-01), Yokozawa
patent: 3507759 (1970-04-01), Shaw

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