Differential GMR sensor with multi-layer bias structure...

Details Differential GMR sensor with multi-layer bias structure... Differential GMR sensor with multi-layer bias structure...

2007-11-20

2007-11-20

Renner, Craig A. (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

C360S324120

Reexamination Certificate

active

10672992

ABSTRACT:
A method for providing a self-pinned differential GMR sensor and self-pinned differential GMR sensor. The differential GMR head includes two self-pinned GMR sensors separated by a gap layer. The gap layer may act as a bias structure to provide antiparallel magnetizations for the first and second free layers without using an antiferromagnetic layer. The gap layer may include four NiFe ferromagnetic layers separated with three interlayers. The gap may also be formed to include a structure defined by Ta/Al2O3/NiFeCr/CuOx. One of the pinned layer may include three ferromagnetic layers so that the top ferromagnetic layer of the bottom pinned layer and the bottom ferromagnetic layer of the bottom pinned layer have a magnetization 180° out of phase. The self-pinned GMR sensors may include synthetic free layers that includes a first free sublayer, an interlayer and a second free sublayer that are biased 180° out of phase.

REFERENCES:
patent: 5648885 (1997-07-01), Nishioka et al.
patent: 5751521 (1998-05-01), Gill
patent: 5768069 (1998-06-01), Mauri
patent: 6259586 (2001-07-01), Gill
patent: 6275363 (2001-08-01), Gill
patent: 6449134 (2002-09-01), Beach et al.
patent: 2002/0075608 (2002-06-01), Kawato
patent: 2002/0126426 (2002-09-01), Gill
patent: 2003/0011939 (2003-01-01), Gill
patent: 2004/0012898 (2004-01-01), Hasegawa
patent: 2004/0086751 (2004-05-01), Hasegawa et al.
patent: 2004/0218311 (2004-11-01), Saito et al.
patent: 2000215421 (2000-08-01), None

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