Pinched-gap magnetic recording thin film head

Details Pinched-gap magnetic recording thin film head Pinched-gap magnetic recording thin film head

1994-09-30

1997-09-30

Levy, Stuart S.

Dynamic magnetic information storage or retrieval

Head

Core

360119, G11B 5147

Patent

active

056731639

ABSTRACT:
An inductive pinched-gap thin film head (TFH) device having pole-tips which are in substantial contact in two areas, thereby precisely defining a pinched-gap segment. The substantial contact between the pole-tips effectively eliminates all flux lines emanating from the edges and corners during the write operation. The write magnetic field is thus precisely confined to across the pinched-gap segment. As a result, the written medium track width is accurately defined by the width of the pinched-gap segment with high degree of magnetization coherency and virtual elimination of the track-edge noise. The improved (medium) signal-to-noise ratio facilitates substantial increase of the track density. Photolithographic definition and etching of the gap-vias to the bottom pole-tip, followed by deposition of the top pole-tip, facilitates precise and consistent control of the width of the pinched-gap segment (and the written track) down to <1 .mu.m. The inductive TFH device may be fabricated in tandem with a magnetoresistive (MR) read device, with one of the pole-tips of the inductive TFH device being substantially wider than the other pole-tip and serving also as a magnetic shield for the read element in the MR device.

REFERENCES:
patent: 4885649 (1989-12-01), Das
patent: 4935832 (1990-06-01), Das et al.
patent: 5012375 (1991-04-01), Nishimura

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