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...

2005-08-02

2005-08-02

Kim, Paul D (Department: 3729)

Metal working

Method of mechanical manufacture

Electrical device making

C029S603090, C029S603120, C360S324100, C360S324110, C360S324120

Reexamination Certificate

active

06922884

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.

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“High frequency permeability measurements on Ni76Fe10Co14/Cu giant magnetoresistive multilayers”; Doyle, W.D.; Fujiwara, H.; Hossain, S.; Matsuzono, A.; Parker, M.R.; Magnetics, IEEE Transactions on, vol.: 30, Issue 6, Nov. 1994; pp.: 382-3830.

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