Simulation study of magnetic media nanostructure and its recording performance

Abstract

Currently, one effective approach to solve the superparamagnetism is to realize the required SNR with less number of grains per bit by improving the grain uniformity. Self-Organized Magnetic Array (SOMA) can significantly reduce the grain number per bit at required SNR by its perfect uniform grain size and array alignment. The simulation results show that the SOMA media can achieve much higher recording density than the conventional recording media at the same grain size. The SOMA media with different anisotropy orientations (3D random, longitudinal, and perpendicular) were investigated. The oriented SOMA medium is preferred for its best recording performance. But this work show there exists bit-array alignment effect in oriented SOMA media. Its recording performance is modulated by this effect. This effect can be reduced by the optimization of media micro-properties. At the same time, the concern on long range ordering of SOMA media is reduced.