Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
67 (1990), S. 4683-4685
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Track edge fluctuations on recording media affect signal-to-noise ratio and servo control, and can provide clues to the medium's magnetic microstructure. We write track edges on longitudinal thin-film magnetic recording media by dc erasing the medium and writing a saturated dc track of opposite magnetization direction on the erased band. We then "read'' the position fluctuations of the x-component reversal of one edge of the written track by centering a head on that edge, and by stepping the head across the edge. Since a straight track edge would not produce any flux change in the read head coil, the voltage output of the head arises from flux changes due to track edge fluctuations. The spectrum of the fluctuations can be deduced by decorrelating the read head sensitivity function from the voltage spectrum. We have used this procedure with several low- and high-noise thin-film media and we find in each case a k−b spectrum (k=wave number) with b near 1. We propose a model which interprets the fluctuations as a superposition of uncorrelated protuberances from a nominal straight edge, and we deduce the size distribution of the protuberances which will generate the observed fluctuation spectrum. Simulated reconstruction of the track edge resulting from a weighted superposition of the protuberances permits semiquantitative inferences to be drawn from the model about the medium microstructure.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.344826
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