Distribution-Based Recording Model for HAMR

Abstract

Heat-assisted magnetic recording operates close to the Curie temperature of the magnetic recording layer. This allows one to neglect grain-to-grain interactions and to develop a recording model based on distributions. The two main ingredients are the anisotropy distribution at every temperature and the Stoner-Wohlfarth grain state distribution at the recording point. From these two distributions a recording spot can be derived, which is the basis for various embodiments of the recording process. After determining characteristic properties of the two distributions for a given recording medium, this approach requires only point-wise operations on arrays representing physical properties in the plane of the recording layer. This allows straightforward investigation of how different parameters impact recording performance. In addition, the calculation time is solely proportional to the spatial resolution in the recording layer.