Write head for improved manufacturability larger write field...

Details Write head for improved manufacturability larger write field... Write head for improved manufacturability larger write field...

2001-07-16

2008-03-25

Heinz, A. J. (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Core

Reexamination Certificate

active

07349179

ABSTRACT:
A magnetic write head provides a significant write field and minimal adjacent track erasure, and lends itself to improved manufacturability. The write head includes a pedestal throat height that defines a bottom pole, P1, and that is substantially recessed from the air bearing surface. The write head further includes a top pole, P2, that defines a nose that is closer to the air bearing surface than the pedestal zero throat. This design achieves a relatively high ratio of the off-track to on-track field. As an example, a 1:4 ratio could be achieved to significantly mitigate the erasure problem of the adjacent tracks resulting from magnetic flux saturation.

REFERENCES:
patent: 5802700 (1998-09-01), Chen et al.
patent: 5805391 (1998-09-01), Chang et al.
patent: 5935644 (1999-08-01), Heim et al.
patent: 6029339 (2000-02-01), Chang et al.
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patent: 6172848 (2001-01-01), Santini
patent: 6301085 (2001-10-01), Sato
patent: 6414824 (2002-07-01), Sasaki
patent: 6459543 (2002-10-01), Sasaki
Kawabe et al.,“Fabrication of Thin Film Inductive Head with Top Core Separated Structure”, IEEE Transactions on Magnetics, vol. 27, No. 6, Nov. 1991, pp. 4936-4938.

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