Density dependence of noise in thin metallic longitudinal media

Abstract

The dependence of noise in thin metallic longitudinal disks on the transition density is investigated. The medium noise is modeled in the time domain by assuming that the recorded transitions are subject to random variations in width as well as in position. A time domain measurement technique is developed to estimate the second order statistics of transition width and transition position as a function of recording density. The results indicate that the noise due to the transition width variations predominates over the noise resulting from the position jitter of the written transitions at high densities where the transition spacing approaches the transition width.