Noise Correlation of Magnetic Thin Film Media

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Abstract
We have experimentally observed a linear relationship between the correlation coefficient of the noise voltages read on a saturated magnetic thin film rigid disk by a magnetic recording head at different radii, and the radial offset of the head between readings, in both longitudinal and perpendicular media. This linear relationship indicates that for the length of the data stream used in the experiments, the noise voltages from adjacent narrow longitudinal strips that could be denoted pseudo microtracks are uncorrelated. The experiments indicate that the correlation length between the pseudo microtracks is less than 0.5 µm. We have used the linear relationship as the basis for a track following scheme that follows an 11.3 µm wide track with 0.3 µm accuracy.

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