Magneto resistive head and magnetic recording apparatus

Details Magneto resistive head and magnetic recording apparatus Magneto resistive head and magnetic recording apparatus

2006-04-18

2006-04-18

Watko, Julie Anne (Department: 2653)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

07031123

ABSTRACT:
A magnetoresistive head comprises a free magnetic layer that has first and second free magnetic films sandwiching a non-magnetic intermediate film therebetween, the respective magnetizing directions of the first and the second free magnetic films are antiparallel. The length of the free magnetic layer in the direction of the track width is 200 nm or less, and a difference between a product of saturation magnetic flux density and a film thickness of the first free magnetic film, and that of the second free magnetic film is within a range from 1 to 3 nmT. By this structure, the variation of output and the variation of asymmetry is greatly decreased at a track width of 200 nm or less.

REFERENCES:
patent: 5408377 (1995-04-01), Gurney et al.
patent: 5930087 (1999-07-01), Brug et al.
patent: 6764778 (2004-07-01), Saito et al.
patent: 6807034 (2004-10-01), Hasegawa et al.
patent: 11053716 (1999-02-01), None
patent: 2000113418 (2000-04-01), None
Hasegawa et al. “Spin-Valve GMR Heads with Synthetic Ferrimagnet Free and Pinned Layers,” Journal of the Magnetics Society of Japan 24:1239-1249 (2000).
Nakamoto et al. “Read-Write Performance of GMR Heads with Lead Overlaid Structure,” Journal of the Magnetics Society of Japan 24:367-370 (2000).

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