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ABSTRACT: We propose a model for a magnetic recording channel to estimate
the influences of the nonlinear distortion of an MR head on the
performance of the PRML system, using a superposition of a magnetic
field and a transfer curve obtained by a micro-magnetic model. A
readback signal was simulated using a nonlinear model. The simulated
signal was compared with an actual readback signal in the analysis of
the isolated pulse, frequency response, and extracted dipulse response.
We found that the nonlinear model represents actual MR head output
satisfactorily, and that the performance of the PR4ML system was
affected by the nonlinear distortion of the MR head for a 5% loss of the
amplitude margin when the asymmetry was within 10%
IEEE Transactions on Magnetics 02/1998; · 1.36 Impact Factor
