Bias point adjustment of a read head by means of an external...

Details Bias point adjustment of a read head by means of an external... Bias point adjustment of a read head by means of an external...

2007-02-06

2007-02-06

Cao, Allen (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

10731553

ABSTRACT:
Reader asymmetry control has become an important issue as track widths continue to shrink. This has been achieved by providing adaptive adjustment to the asymmetry of individual heads in the form of an additional permanent hard magnet, which may be internal or external to the head. This special ‘tuning’ magnet biases the shields and the sensor to achieve suitable asymmetry and/or amplification. Head bias adjustments may be done individually or in batch. Both the internal and the external magnet versions are described.

REFERENCES:
patent: 4450493 (1984-05-01), Watrous
patent: 5742998 (1998-04-01), Jones, Jr.
patent: 6798623 (2004-09-01), Seigler et al.
patent: 6798729 (2004-09-01), Hurst et al.
patent: 7035061 (2006-04-01), Singleton et al.
patent: 2004/0264049 (2004-12-01), Brown et al.
patent: 2005/0141119 (2005-06-01), Takeuchi et al.

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