An experimental study of hard-transition peakshifts through the overwrite spectra

The authors have developed a frequency-domain method for the measurement of hard-transition peak-shifts, using the intensities of spectral peaks as measured by a spectrum analyzer. They review the conventional overwrite environment, where a lower frequency old CW (continuous-wave) pattern is overwritten by a higher frequency new CW pattern. They then define a new overwrite parameter (OWQ) that can be shown from theory to relate in a simple manner to the hard-transition peak-shift and shape-broadening effects. To study the validity of this approach, the authors have performed time- and frequency-domain measurements over a wide range of writeability conditions for thin-film inductive heads on both a thin and a thick metal-film disk. Results show that for the thin disk, the frequency-domain results agree well with the time-domain results