Synthetic free layer for CPP GMR

Details Synthetic free layer for CPP GMR Synthetic free layer for CPP GMR

2005-10-11

2005-10-11

Meeks, Timothy (Department: 1762)

Coating processes

Magnetic base or coating

Magnetic coating

C427S132000, C360S324120

Reexamination Certificate

active

06953601

ABSTRACT:
Reduction of the free layer thickness in GMR devices is desirable in order to meet higher signal requirements, besides improving the GMR ratio itself. However, thinning of the free layer reduces the GMR ratio and leads to poor thermal stability. This problem has been overcome by making AP2from an inverse GMR material and by changing the free layer from a single uniform layer to a ferromagnetic layer AFM (antiferromagnetically) coupled to a layer of inverse GMR material. Examples of alloys that may be used for the inverse GMR materials include FeCr, NiFeCr, NiCr, CoCr, CoFeCr, and CoFeV. Additionally, the ruthenium layer normally used to effect antiferromagnetic coupling can be replaced by a layer of chromium. A process to manufacture the structure is also described.

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