Thin-film, perpendicular magnetic recording and reproducing head

Details Thin-film, perpendicular magnetic recording and reproducing head Thin-film, perpendicular magnetic recording and reproducing head

1988-12-23

1990-07-24

Severin, David J.

Dynamic magnetic information storage or retrieval

Head

Core

29603, 360122, G11B 5147

Patent

active

049438824

ABSTRACT:
A thin-film, perpendicular magnetic recording and reproducing head includes a magnetic substrate having a mechanochemically polished principal surface provided with a plurality grooves filled with a nonmagnetic material and a thin-film conductor coil provided on the polished surface of the substrate. A first insulating layer covering the coil, formed from an inorganic oxide and having a thickness of 0.3 to 3.0 .mu.m is provided therethrough with a via hole which extending to a portion of the surface of the magnetic substrate and a first main pole covers the first insulating layer and extends into the via hole to the surface of the magnetic substrate. A second insulating layer formed from an inorganic oxide covers the first main pole and the first insulating layer and has a finely polished surface in which the first main pole has a finely polished exposed surface. A flat second main pole having a small thickness is provided on the polished surfaces of the first main pole and the second insulating layer. A protective overcoat covers the second main pole and the second insulating layer.

REFERENCES:
patent: 4651248 (1987-03-01), Shiiki et al.
patent: 4685014 (1987-08-01), Hanazono et al.
patent: 4716484 (1987-12-01), Kaminaka et al.
patent: 4743988 (1988-05-01), Sato
patent: 4855854 (1989-08-01), Wada et al.

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