Domain wall free shields of MR sensors

Details Domain wall free shields of MR sensors Domain wall free shields of MR sensors

2007-05-16

2008-09-23

Cao, Allen T (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

07428126

ABSTRACT:
A magnetic reader of the present invention comprises an MR sensor shielded by a magnetic shield including single domain soft magnetic materials. The domain wall free magnetic shield includes an unbiased soft magnetic layer and a biased soft magnetic layer separated by a non-magnetic layer. The easy axis of the biased layer is oriented to create a path for magnetic flux through the biased and unbiased layers thereby reducing the demagnetization field of the shield. A biasing layer maintains the first and second magnetic layers as single domain magnets. The biasing layer is further shaped to define a quiet zone where the biasing layer does not overlay the MR sensor.

REFERENCES:
patent: 5208715 (1993-05-01), Mowry
patent: 5515221 (1996-05-01), Gill et al.
patent: 5621592 (1997-04-01), Gill et al.
patent: 5808843 (1998-09-01), Kobayashi et al.
patent: 6018443 (2000-01-01), Watanabe et al.
patent: 6157525 (2000-12-01), Iwasaki et al.
patent: 6404601 (2002-06-01), Rottmayer et al.
patent: 6430009 (2002-08-01), Komaki et al.
patent: 6437949 (2002-08-01), Macken
patent: 6456467 (2002-09-01), Mao et al.
patent: 6500570 (2002-12-01), Hasegawa et al.
patent: 7016165 (2006-03-01), Chien et al.
patent: 2002/0008945 (2002-01-01), Mack et al.
patent: 2002/0044390 (2002-04-01), Narumi et al.
patent: 2002/0064002 (2002-05-01), Gill
patent: 2002/0126423 (2002-09-01), Terunuma et al.
patent: 2002/0141119 (2002-10-01), Saito
patent: 2002/0167768 (2002-11-01), Fontana et al.
patent: 2002/0171982 (2002-11-01), Lairson et al.
patent: 2002/0181164 (2002-12-01), Macken et al.
patent: 2002/0191353 (2002-12-01), Sato
patent: 2003/0086215 (2003-05-01), Kief et al.
patent: 2006/0158793 (2006-07-01), Arasawa et al.

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