Abstract
Thermal relaxation in perpendicular double-layered media was examined by simulation and experiments, using a single-pole writing head and an MR flying head. A new FEM simulation with a curling switching model is expanded in association with the exponential relaxation theory. The simulation indicates that the relaxation is less at high densities than at low densities. Only a 2% output deterioration due to thermal relaxation was actually confirmed experimentally for about 105 seconds at 5 kFRPI, and there was almost no deterioration at 130 kFRPI. In contrast to longitudinal recording, less output reduction is observed for higher linear densities; this is well explained by the nature of the demagnetization field in perpendicular magnetic recording.
