Ultra small track width thin film magnetic transducer

Details Ultra small track width thin film magnetic transducer Ultra small track width thin film magnetic transducer

1991-01-18

1993-02-23

Levy, Stuart S.

Dynamic magnetic information storage or retrieval

Head

Core

360122, 360123, G11B 5147

Patent

active

051895803

ABSTRACT:
An ultra small track width magnetic transducer and manufacturing method. The transducer has two coplanar confronting magnetic poles provided by a thin film layer of magnetic material. The thickness of the layer defines a track width. A transducing gap is etched in the magnetic layer by utilizing focused ion beam milling technology. The thusly obtained gap has a predetermined length and depth and it separates the magnetic layer into two confronting coplanar magnetic poles. A layer of non-magnetic material is deposited over the magnetic layer to fill the transducing gap. The transducing gap may be etched in a plane extending orthogonally to the plane of the magnetic core layer. Alternatively, the transducing gap plane may extend at an oblique angle to the magnetic core layer to obtain a transducing gap useful in aximuth recording/playback. A window in the magnetic layer interconnects conductor leads to form a transducer winding.

REFERENCES:
patent: 3805291 (1974-04-01), Sakurai
patent: 4639289 (1987-01-01), Lazzari
patent: 4914537 (1990-04-01), Ota
patent: 4942490 (1990-07-01), Lehreau
patent: 4949207 (1990-08-01), Lazzari
patent: 4979064 (1990-12-01), Mage et al.
patent: 5025341 (1991-06-01), Bousquet et al.
IBM Tech. Discl. Bull., vol. 15, No. 2, Jul. 1972, pp. 516-517 "Horizontal Thin Film Head With Symmetrical Windings" by R. B. Watrous.
IBM Technical Disclosure Bulletin, vol. 15, No. 10, Mar. 1973, pp. 3252-3254 "Narrow Track Thin Film Recording Head" by M. Klein.

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