Method for preventing magnetic damage to a GMR head during...

Details Method for preventing magnetic damage to a GMR head during... Method for preventing magnetic damage to a GMR head during...

2007-10-30

2007-10-30

Kim, Paul D. (Department: 3729)

Metal working

Method of mechanical manufacture

Electrical device making

C029S603100, C029S603150, C029S603160, C029S603180, C360S324100, C360S324110, C360S324120, C361S267000

Reexamination Certificate

active

11172297

ABSTRACT:
A method is provided for preserving the transverse biasing of a GMR (or MR) read head during back-end processing. In a first preferred embodiment, the method comprises magnetizing the longitudinal biasing layers of the read head in a transverse direction, so that the resulting field at the position of the transverse biasing layer places it in a minimum of potential energy which stabilizes its direction. The field of the longitudinal biasing layer is then reset to the longitudinal direction in a manner which maintains the transverse biasing direction. In a second embodiment, a novel fixture for mounting the read head during processing includes a magnetic portion which stabilizes the transverse bias of the read head. The two methods may be used singly or in combination.

REFERENCES:
patent: 5465185 (1995-11-01), Heim et al.
patent: 5793576 (1998-08-01), Gill
patent: 6080476 (2000-06-01), Kanbe et al.
patent: 6146813 (2000-11-01), Girard et al.
patent: 6230389 (2001-05-01), Zhu
patent: 6374479 (2002-04-01), Sasaki et al.
patent: 6415500 (2002-07-01), Han et al.

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