Thin-film magnetic head

Details Thin-film magnetic head Thin-film magnetic head

1982-01-18

1984-12-25

Kilgore, Robert Martin

Dynamic magnetic information storage or retrieval

Head

Core

360119, 360123, G11B 516, G11B 525, G11B 520

Patent

active

044907605

ABSTRACT:
A thin-film magnetic head having a magnetic substrate made from ferrite, iron-aluminum-silicon alloy or like material, and an upper magnetic layer formed on the magnetic substrate with a lower magnetic layer and a conductive layer interposed therebetween. A portion of the upper magnetic layer is jointed to the magnetic substrate while another portion of the upper magnetic layer is jointed to the lower magnetic layer through a non-magnetic layer of SiO.sub.2 or like material constituting a magnetic gap. The lower magnetic layer, magnetic substrate, upper magnetic layer and the non-magnetic layer in combination form a closed magnetic circuit. A groove is defined between the lower magnetic layer and the magnetic substrate, and formed in the side surface of the magnetic substrate adapted to face a magnetic recording medium. The recess is filled with a non-magnetic material such as glass. Accordingly, it is possible to realize a definite pole piece length to permit an improvement in short-wavelength reproduction characteristics.

REFERENCES:
patent: 3639699 (1972-02-01), Tiemann
patent: 3662119 (1972-05-01), Romankiw
patent: 4092688 (1978-05-01), Nomura
patent: 4353102 (1982-10-01), Kanai
patent: 4386383 (1983-05-01), Desserre
patent: 4404609 (1983-09-01), Jones

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