Principal complementarity between perpendicular and longitudinal magnetic recording

Complementarity law between contrasting characteristics of longitudinal and perpendicular recording is described. The complementarity includes orthogonal field distributions of single-pole head and ring head due to the spatial configuration of pole structure. Significant dependence of recording resolution upon media parameters (δ, Hc, Br) in longitudinal recording is indicated. In contrast, these parameters do not govern the resolution in perpendicular recoding. This intrinsic difference is caused by the opposite effects of demagnetization. Read/write characteristics in hard disk drives are found to obey these complementary relationships during prototyping.