Thin film magnetic head with separated yoke and pole tips

Details Thin film magnetic head with separated yoke and pole tips Thin film magnetic head with separated yoke and pole tips

1998-09-11

2000-10-24

Evans, Jefferson

Dynamic magnetic information storage or retrieval

Head

Hall effect

360126, G11B 5187, G11B 539

Patent

active

061376523

ABSTRACT:
The present invention relates to an improvement in the write pole structure at a thin film magnetic head. At a write element, a gap film is provided between a first pole portion and a second pole portion. The first pole portion includes a second magnetic film adjacent the gap film and a first magnetic film adjacent the second magnetic film. The second pole portion includes a third magnetic film and a fourth magnetic film. The third magnetic film is provided adjacent to the gap film. The fourth magnetic film is provided adjacent to the third magnetic film. The surface of the fourth magnetic film facing opposite the medium is set within a width W21 of the third magnetic film in the direction of the tracks at its surface facing opposite the medium. In other words, the width W21 of the third magnetic film at the surface facing opposite the medium and a width W22 of the fourth magnetic film at its surface facing opposite the medium satisfy a relationship expressed as W22.ltoreq.W21. Thus, unnecessary magnetic recording occurring due to leaked magnetic field is prevented.

REFERENCES:
patent: 5438747 (1995-08-01), Krounbi et al.
patent: 5452164 (1995-09-01), Cole et al.
patent: 5473491 (1995-12-01), Fujisawa et al.
patent: 5559653 (1996-09-01), Shouji et al.
patent: 5600519 (1997-02-01), Heim et al.
patent: 5649351 (1997-07-01), Cole et al.

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