The dependence of overwrite on proximity effects

The widely held theories of overwrite (OW) on thin film media predict very little sensitivity to the low frequency used in the measurement. Here experimental data is shown with a variation of more than 15 dB as the low frequency is changed from 1/2 to 1/14 of the high frequency pattern. Tang and Tsang's work (1993) on interpattern interactions is used to explain the sensitivity of OW to the specific frequencies used in the measurement.