Process to manufacture a CPP GMR read head

Details Process to manufacture a CPP GMR read head Process to manufacture a CPP GMR read head

2007-07-23

2008-11-04

Kim, Paul D (Department: 3729)

Metal working

Method of mechanical manufacture

Electrical device making

C029S603130, C029S603150, C029S603180, C216S065000, C360S122000, C360S317000, C451S005000, C451S041000

Reexamination Certificate

active

07444741

ABSTRACT:
Biasing schemes used for CIP GMR devices were previously thought to be impractical for CPP devices due to current shunting by the abutted hard magnets. In the present invention the CPP stripe is a narrow conductor directly above the free layer. The resistivity of the latter is made to be relatively high so the sensing current diverges very little as it passes through it. This makes it possible to use abutted hard magnets for longitudinal bias with virtually no loss of sensing current due to shunting by the magnets.

REFERENCES:
patent: 5739987 (1998-04-01), Yuan et al.
patent: 6353318 (2002-03-01), Sin et al.
patent: 6496334 (2002-12-01), Pang et al.
patent: 6560077 (2003-05-01), Fujiwara et al.
patent: 7094130 (2006-08-01), Cyrille et al.
patent: 2002/0131215 (2002-09-01), Beach

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