Antiparallel pinned spin valve sensor with read signal symmetry

Details Antiparallel pinned spin valve sensor with read signal symmetry Antiparallel pinned spin valve sensor with read signal symmetry

1997-10-27

1999-03-09

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 539

Patent

active

058809139

ABSTRACT:
An Anti-Parallel (AP)-pinned spin valve (SV) sensor having a free layer disposed between an AP-pinned layer and a pinned layer. The free layer being separated from the AP-pinned layer by a first conducting spacer and separated from the pinned layer by a second conducting spacer layer. The AP-pinned layer includes a first, second and third AP-pinned layers where the first and second AP-pinned layers are separated from the third AP-pinned layer by an anti-parallel coupling layer. The first AP-pinned layer is formed over and in contact with an antiferromagnetic (AFM) layer. The AFM layer is used to pin the AP-pinned layer magnetizations directions. The presence of both an AP-pinned layer and a pinned layer dramatically improves the symmetry of the signal read by the SV sensor; the presence of the second spacer layer made of GMR promoting material increases the GMR coefficient; and the addition of the first AP-pinned layer eliminates the interdiffusion at the interface between the AFM and the AP-pinned layer resulting in larger GMR coefficient, well controlled net moment, and a highly stable sensor.

REFERENCES:
patent: 5341261 (1994-08-01), Dieny et al.
patent: 5408377 (1995-04-01), Gurney et al.
patent: 5422571 (1995-06-01), Gurney et al.
patent: 5508867 (1996-04-01), Cain et al.
patent: 5585986 (1996-12-01), Parkin
patent: 5648885 (1997-07-01), Nishioka et al.
patent: 5701222 (1997-12-01), Gill et al.
patent: 5793207 (1998-08-01), Gill
Ultrathin Magnetic Structures II, "Measurement Techniques and Novel Magnetic Properties", Springer-Verlag, 1994 pp. 174-194.

Affiliated with

Also associated with

Rating

Antiparallel pinned spin valve sensor with read signal symmetry does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Antiparallel pinned spin valve sensor with read signal symmetry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Antiparallel pinned spin valve sensor with read signal symmetry will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1327284