CPP read head for high density and shield noise suppression

Details CPP read head for high density and shield noise suppression CPP read head for high density and shield noise suppression

2007-01-30

2007-01-30

Tupper, R. S. (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

10650602

ABSTRACT:
It is known that the magnetic shields, between which CPP GMR stacks are sandwiched, can be a source of AMR (anisotropic magneto-resistance) noise. This has been significantly reduced by coating both the magnetic shields with highly conductive layers. If the guidelines disclosed in the invention are followed, the read head can exhibit AMR noise reduced by about 14 to 20. Additionally, the total thickness of the read gap can be maintained to be as low as 300 to 400 Angstroms.

REFERENCES:
patent: 5784224 (1998-07-01), Rottmayer et al.
patent: 5959811 (1999-09-01), Richardson
patent: 6396670 (2002-05-01), Murdock
patent: 6469879 (2002-10-01), Redon et al.
patent: 6473279 (2002-10-01), Smith et al.
patent: 6496335 (2002-12-01), Gill
patent: 6515573 (2003-02-01), Dong et al.

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