Abstract
Limits in estimating reproduced waveforms at high linear recording density and density response curves by superposing reproduced isolated pulses are studied. First, a method of averaging measured isolated pulses from an MR head on a spin-stand tester by cross-correlation is described. Then, reproduced waveforms at high linear recording density are simulated by superposition of the averaged reproduced isolated pulses and compared with the measured ones. The results show that the estimable limitation in the superposition method exists at some high linear density, since the measured isolated pulses include noise. It is also shown that the density response curves can be correctly estimated by this method, even when amplitude asymmetry between positive and negative isolated pulses exists up to that limited linear density.
