Micromagnetic simulation of pseudorandom sequences for equalized SNR estimations in longitudinal recording

Summary form only given. The determination of signal to noise (SNR) and signal to distortion (SDR) ratios is important in estimating bit error rate in recording systems. The effects of signed equalization also modify the relative contributions of SNR and SDR. In this paper, we simulate the recording of a 31 bit pseudorandom sequence (PRS) of data by writing with head fields derived from a finite element model (FEM) with an exponential risetime onto a longitudinal recording media. The media is modeled by an array of uniformly magnetized cubes and brought to equilibrium after discrete downtrack translations of the write head until the PRS is completed. The process is repeated 46 times with different easy axis distributions of the cubes (grains).