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Model for demagnetization-induced noise in thin-film magnetic recording media

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4 Author(s)
Katti, R.R. ; Magnetics Technol. Center, Carnegie-Mellon Univ., Pittsburgh, PA, USA ; Veeravalli, V.V. ; Kryder, M.H. ; Kumar, B.V.K.V.

A linear, statistical model is described which predicts the power spectrum of measured noise in bulk-demagnetized (i.e. AC-erased) thin-film magnetic recording media. It is shown that the noise is the result of magnetic flux which is ascribed to erasure-induced transitions along the track length in the medium. The noise power spectrum for a rigid disk medium is shown to correspond to the power spectrum of Poisson-distributed induced transitions along the track length, while noise along the track width is sufficiently described in terms of a uniform, average magnetization with small variance. Experimental data from two thin-film disks are used with the model to estimate the Poisson parameter for each disk. It is demonstrated that AC-erased noise from particulate media can be considered as a limiting case of the Poisson model

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Magnetics, IEEE Transactions on  (Volume:24 ,  Issue: 4 )