Effects of head pole aspect ratio and skew angle on areal density in perpendicular recording

Semianalytical models have been applied to examine the effect of head pole aspect ratio on areal density in perpendicular recording at different skew angles. It has been found that at zero skew angle, increasing pole length enhances the writing field, which allows higher medium H_K and smaller grain size and leads to higher areal density. However, when the skew angle is included, the pole aspect ratio needs to be optimized to deliver the optimal areal density. Both the optimal areal density and pole aspect ratio decrease with increasing the skew angle.