Dynamic self-consistent iterative simulation of high bit density digital magnetic recording

A dynamic iterative model is presented for the simulation of high bit density digital magnetic recording systems. In addition to the write head fringing field, the demagnetizing fields, and the image charge fields, the model considers an arbitrary write current waveform and a finite flux risetime for any coded pattern, a complete family of minor loops, the leading edge magnetization distribution, and cable and amplifier loading effects, in a continuous recording process. The novel treatment of complex head sensitivity functions and the utilization of complex Fourier transformation techniques for signal analysis yield results for arbitrary high bit density patterns that are in excellent agreement with experiment in absolute timing and signal amplitude.