Thin film magnetic head having upper pole chip formed over insul

Details Thin film magnetic head having upper pole chip formed over insul Thin film magnetic head having upper pole chip formed over insul

1998-06-18

2000-10-10

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Head

Core

G11B 5147

Patent

active

061308056

ABSTRACT:
On a first magnetic layer 27, is formed a ring-shaped insulating layer 28 whose air bearing surface side edge defines a reference position for a throat height, and after forming a write gap layer 29, a second magnetic layer 30 is formed such that the second magnetic layer extends over the ring-shaped insulating layer 28. The write gap layer is selectively removed by performing an etching process using the second magnetic layer as a mask, and then the first magnetic layer is partially removed over a part of its thickness to form a trim structure. After forming a thin film coil 33, 35 within the ring-shaped insulating layer, a third magnetic layer is formed to be brought into contact with a rear portion of the second magnetic layer 31. The third magnetic layer may be contacted with a surface, a surface and side walls or a surface, side walls and an end surface of rear portion of the second magnetic layer. In the thin film magnetic head, a pole chip defining a track width is narrow, magnetic flux saturation and leakage of magnetic flux can be suppressed in spite of a short throat height, and a high recording efficiency can be attained. The invention provides a method of manufacturing easily the thin film magnetic head having such superior performance with a high yield.

REFERENCES:
patent: 5872693 (1999-02-01), Yoda
patent: 5935644 (1999-08-01), Heim

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