Model for Demagnetization-Induced Noise in Thin-Film Magnetic Recording Media

Romney R. Katti, Venugopal V. Veeravalli, Mark H. Kryder, B. V.K.Vijaya Kumar

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Pages (from-to)2150-2158
Number of pages9
JournalIEEE Transactions on Magnetics
Issue number4
StatePublished - Jul 1988

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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