Modeling Perpendicular Magnetic Multilayered Oxide Media With Discretized Magnetic Layers

A discretized magnetic media model is developed to improve our ability to describe the high-frequency recording performance of perpendicular magnetic media. The new model differs from the traditional macrospin model in that the magnetic grains are subdivided into cells, which have varying magnetic properties and independent magnetic moments. This discretized media model has two realizations: one with a discretized magnetic boundary and one without the magnetic boundary. We focus on the resolution and the signal-to-noise ratio obtained from a high-density bit pattern as the bit length approaches the grain pitch. Simulation results demonstrating the impact of a discretized cap in this recording regime will be discussed. The increased computational effort needed to perform a simulation using this discretized media model, and has been addressed by porting this model to a cluster of graphics processing units.