Spin valve sensors having synthetic antiferromagnet for...

Details Spin valve sensors having synthetic antiferromagnet for... Spin valve sensors having synthetic antiferromagnet for...

2007-10-30

2007-10-30

Bernatz, Kevin M. (Department: 1773)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

C360S324110, C360S324120, C428S811000, C428S811200, C428S811500

Reexamination Certificate

active

09828635

ABSTRACT:
Magnetoresistive (MR) sensors are disclosed having mechanisms for reducing edge effects such as Barkhausen noise. The sensors include a pinned layer and a free layer with an exchange coupling layer adjoining the free layer, and a ferromagnetic layer having a fixed magnetic moment adjoining the exchange coupling layer. The exchange coupling layer and ferromagnetic layer form a synthetic antiferromagnetic structure with part of the free layer, providing bias that reduces magnetic instabilities at edges of the free layer. Such synthetic antiferromagnetic structures can provide a stronger bias than conventional antiferromagnetic layers, as well as a more exactly defined track width than conventional hard magnetic bias layers. The synthetic antiferromagnetic structures can also provide protection for the free layer during processing, in contrast with the trimming of conventional antiferromagnetic layers that exposes if not removes part of the free layer.

REFERENCES:
patent: 5287238 (1994-02-01), Baumgart et al.
patent: 5408377 (1995-04-01), Gurney et al.
patent: 5436778 (1995-07-01), Lin et al.
patent: 5666247 (1997-09-01), Schultz
patent: 5725963 (1998-03-01), Iwasaki et al.
patent: 5742459 (1998-04-01), Shen et al.
patent: 5756191 (1998-05-01), Hashimoto et al.
patent: 5768066 (1998-06-01), Akiyama et al.
patent: 5768067 (1998-06-01), Saito et al.
patent: 5896252 (1999-04-01), Kanai
patent: 5910868 (1999-06-01), Kurosawa et al.
patent: 5914839 (1999-06-01), Matsuzono et al.
patent: 5949622 (1999-09-01), Kamiguchi et al.
patent: 5958576 (1999-09-01), Takiguchi
patent: 5976713 (1999-11-01), Fuke et al.
patent: 5989690 (1999-11-01), Fujikata et al.
patent: 5991125 (1999-11-01), Iwasaki et al.
patent: 5995338 (1999-11-01), Watanabe et al.
patent: 6031692 (2000-02-01), Kawawake et al.
patent: 6055135 (2000-04-01), Fukamichi et al.
patent: 6061210 (2000-05-01), Gill
patent: 6122151 (2000-09-01), Saito et al.
patent: 6201673 (2001-03-01), Rottmayer et al.
patent: 6381105 (2002-04-01), Huai et al.
patent: 6396734 (2002-05-01), Ishikawa et al.
patent: 6462919 (2002-10-01), Mack et al.
patent: 6496338 (2002-12-01), Hasegawa et al.
patent: 6501627 (2002-12-01), Noma et al.
patent: 2001/0033466 (2001-10-01), Ooshima et al.
patent: 2001/0050859 (2001-12-01), Schwarzl
patent: 2004/0136122 (2004-07-01), Beach
Merriam-Webster's Collegiate Dictionary, 10thEd., p. 14.
Derwemt Abstract of WO 2001-03130 A1 (Derwent Acc. No.: 2001-535833).
Derwent Abstract Translation of US 2001/0050859 A1 and DE 19836567 A1 (Derwent Acc-No. 2000-183992).

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