Magnetoresistive sensor having cobalt-iron alloy layer in...

Details Magnetoresistive sensor having cobalt-iron alloy layer in... Magnetoresistive sensor having cobalt-iron alloy layer in...

2007-12-18

2007-12-18

Cao, Allen (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

11043118

ABSTRACT:
A magnetoresistive sensor comprises a pinned layer having a magnetization direction fixed with respect to an external magnetic field, a free layer, having a magnetization direction variable in accordance with the external magnetic field, and a spacer layer mainly containing copper, sandwiched between the pinned layer and the free layer. A sense current flows through the pinned layer, the spacer layer, and the free layer substantially in a direction in which the layers are stacked. The free layer comprises at least one intermediate stack composed of a non-magnetic layer mainly containing copper, and a first cobalt iron layers made of a cobalt iron alloy and disposed on boundaries on both sides of the non-magnetic layer, a nickel iron alloy layers disposed on boundaries on both sides of the intermediate stack, and a second cobalt iron layer made of a cobalt iron alloy and formed in contact with the spacer layer on a boundary, opposing the spacer layer, of a stack composed of the intermediate stack and the nickel iron alloy layer.

REFERENCES:
patent: 6947263 (2005-09-01), Saito
patent: 2003/0011463 (2003-01-01), Iwasaki et al.
patent: 2003/0090844 (2003-05-01), Shimizu et al.
patent: 2004/0145850 (2004-07-01), Fukumoto et al.
patent: 2006/0061917 (2006-03-01), Gill et al.
patent: 2003-8103 (2003-01-01), None
patent: 2003-152239 (2003-05-01), None

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