Dynamic magnetic information storage or retrieval – Head – Core
Patent
1988-01-11
1989-11-14
Wolff, John H.
Dynamic magnetic information storage or retrieval
Head
Core
360126, G11B 516
Patent
active
048811440
ABSTRACT:
In a thin film magnetic head of the type wherein a lower magnetic pole, a gap layer, a first insulating layer, a coil, a second insulating layer and an upper magnetic pole are formed sequentially on a substrate, the present invention provides a thin film magnetic head characterized in that a surface active layer made of aluminum oxide, for example, is disposed between the first insulating layer and the second insulating layer except where the coil is formed on the first insulating layer so that the surface active layer is disposed between the coil and the second insulating layer. According to the present invention, it is possible to prevent the occurrence of bubbles between coil conductors, and eventually to improve flatness of the surface of the second insulating layer and to prevent degradation of the characteristics of the upper magnetic pole.
REFERENCES:
patent: 4636897 (1987-01-01), Nakamura et al.
patent: 4651248 (1987-03-01), Shiiki et al.
patent: 4760481 (1988-07-01), Yuito et al.
Fabrication of a Thin Film Head Using Polyimide Resin and Sputtered Ni-Fe Films, Journal of Applied Physics, Mar. 1982, pp. 2608-2610.
Fabrication of a Multitrack, Thin-Film Head, Journal of Applied Physics, Mar., 1982, pp. 2611-2613.
Hamakawa Yoshihiro
Moriwaki Eijin
Shiiki Kazuo
Takano Hisashi
Yuito Isamu
Hitachi , Ltd.
Wolff John H.
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