Dynamic magnetic information storage or retrieval – Head – Core
Patent
1985-10-03
1987-10-27
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Head
Core
360123, G11B 517, G11B 531
Patent
active
047033835
ABSTRACT:
A thin-film magnetic film composed of a substrate, a lower magnetic layer, a first insulating layer, a coil conductor, a second insulating layer, and an upper magnetic layer accumulated in this order. The cross-section of the coil conductor has a trapezoidal shape having skirts at the lower end of the sides thereof. Owing to the presence of the skirts, the surface of the second insulating layer formed thereon can be made flat by ion etching, and consequently the surface of the upper magntic layer is made flat. The incident angle of the ion beam and the thickness of the photoresist used in the ion etching process to make the pattern of the coil conductor layer are determined so that the cross-sectional shape of the coil conductor is a trapezoid having skirts at the lower ends thereof.
REFERENCES:
patent: 4416056 (1983-11-01), Takahashi
Katou Yoshiaki
Ueoka Joe
Yoshida Satoshi
Ferguson Jr. Gerald J.
Foycik, Jr. Michael J.
Fuji Photo Film Co. , Ltd.
Hoffman Michael P.
Tupper Robert S.
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