Patent ID: 6937448

Claim:
A magnetic head including a spin valve sensor comprising: a magnetic shield layer (S 1 ) being fabricated above a substrate base; a first electrical insulation layer (G 1 ) being fabricated above said S 1 layer; a spin valve sensor structure being disposed above said G 1 layer; wherein said spin valve sensor structure includes a seed layer being fabricated above said G 1 layer, an antiferromagnetic layer being disposed above said seed layer, a pinned magnetic layer being comprised of a laminated structure including layers of CoFe, Ru, nd CoFe and being disposed above said antiferromagnetic layer, a spacer layer being comprised of CuO x and being disposed upon said pinned magnetic layer, and a free magnetic layer being comprised of a laminated structure including layers of CoFe and NiFe and being dispose upon said spacer layer; and wherein a magnetic coupling field exists across said CuO x spacer layer having a coupling field strength of from −5 Oe to −15 Oe, and said CuO x spacer layer is formed with a thickness of from 16 Å to 20 Å.