Magnetic sensing element and method for manufacturing the same

Details Magnetic sensing element and method for manufacturing the same Magnetic sensing element and method for manufacturing the same

2011-08-30

2011-08-30

Cao, Allen T (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

08009391

ABSTRACT:
An underlying layer is composed of Co—Fe—B that is an amorphous magnetic material. Thus, the upper surface of the underlying layer can be taken as a lower shield layer-side reference position for obtaining a gap length (GL) between upper and lower shields, resulting in a narrower gap than before. In addition, since the underlying layer has an amorphous structure, the underlying layer does not adversely affect the crystalline orientation of individual layers to be formed thereon, and the surface of the underlying layer has good planarizability. Accordingly, PW50 (half-amplitude pulse width) and SN ratio can be improved more than before without causing a decrease in rate of change in resistance (Δ R/R) or the like, thereby achieving a structure suitable for increasing recording density.

REFERENCES:
patent: 7916436 (2011-03-01), Ishizone et al.
patent: 2008/0291586 (2008-11-01), Ishizone et al.
patent: 2001-28108 (2001-01-01), None
patent: 2001-52316 (2001-02-01), None
patent: 2001-176027 (2001-06-01), None

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