A Computer Simulation of Electrical Loss and Loading Effect in Magnetic Recording

A model is presented for evaluating the electrical loss (assuming the head medium is not infinitely permeable) and loading effect of the readback process in magnetic recording. The technique is based on the fact that the readback process can be approximated as linear and that the read head is a linear frequency-variant device. After approximating the open-circuit readback signal by a Fourier series, the readback signal with loading and electrical loss is the summation of the responses produced by the harmonic components. Examples are given to evaluate the electrical loss and loading effect on the readback signal. Simulation results agree well with experimental results.