CPP GMR read head with minimum shunting loss

Details CPP GMR read head with minimum shunting loss CPP GMR read head with minimum shunting loss

2007-07-24

2011-11-15

Heinz, Allen (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

C360S324200

Reexamination Certificate

active

08059372

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:
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patent: 7634851 (2009-12-01), Tuttle
patent: 7710689 (2010-05-01), Lille
patent: 2002/0131215 (2002-09-01), Beach

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