Three dimensional simulation of side-writing and crosstalk for thin film heads with various pole shapes

Side-fringing fields of thin-film heads are studied with the three-dimensional simulation code TOSCA. Readback signals are calculated using the principle of reciprocity for various pole shapes and off-tracks. Read/write characteristics are evaluated in the presence of side-writing and crosstalk. They depend on the shape of the interface between the pole and the air-bearing surface of the sliders. The side-writing is large when the side angle is small. Crosstalk is large when the side angle is small and the projection of the pole from the track edge is large. A pole edge shape on the air bearing surface of thin-film heads that produces a narrow head field outside of the track and a sharp head field gradient is concluded to be essential to achieve large side-writing and small crosstalk