Currently, in a process of manufacturing a top spin valve structure, the
shield-to-shield separation of a spin valve head cannot be below about
800 .ANG., mainly due to sensor-to-lead shorting problems. This problem
has now been overcome by inserting a high permeability, high resistivity,
thin film shield on the top or bottom (or both) sides of the spin valve
sensor. A permeability greater than about 500 is required together with a
resistivity about 5 times greater than that of the free layer and an
M.sub.rT value for the thin film shield that is 4 times greater than that
of the free layer.