CONSIDERATIONS IN THE DESIGN OF PROBE HEADS FOR 100 GBIT IN(2) RECORDING DENSITY/

Thin film perpendicular playback yoke-GMR heads capable of reading at a density of 100 Gbit/in(2) have been designed using 3D boundary eleme nt reciprocity modeling. Two basic head types are considered, a single pole and a ring-type geometry. The influence on the playback voltage and D-50 of the throat height, fly height, and permeability are studie d. Isolated pulse response, roll-off curves, and off-track profiles ar e calculated. Media with and without a soft underlayer are also consid ered. The simulations show that of the designs studied the ring head i n combination with the media without a soft underlayer has playback pr operties suitable for this density.