CPP GMR and magnetostriction improvement by laminating Co 90...

Details CPP GMR and magnetostriction improvement by laminating Co 90... CPP GMR and magnetostriction improvement by laminating Co 90...

2006-11-28

2006-11-28

Bernatz, Kevin M. (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Magnetic head

C428S811500, C428S812000, C360S324110, C360S324120

Reexamination Certificate

active

07141314

ABSTRACT:
A current-perpendicular-to-plane (CPP) giant magnetoresistive (GMR) sensor of the synthetic spin valve type and its method of formation are disclosed, the sensor including a novel laminated free layer having ultra-thin (less than 3 angstroms thickness) laminas of Fe50Co50(or any iron rich alloy of the form CoxFe1−xwith x between 0.25 and 0.75) interspersed with thicker layers of Co90Fe10and Cu spacer layers to produce a free layer with good coercivity, a coefficient of magnetostriction that can be varied between positive and negative values and a high GMR ratio, due to enhancement of the bulk scattering coefficient by the laminas. The configuration of the lamina and layers in periodic groupings allow the coefficient of magnetostriction to be finely adjusted and the coercivity and GMR ratio to be optimized. The sensor performance can be further improved by including layers of Cu and Fe50Co50in the synthetic antiferromagnetic pinned layer.

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