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On the noise power spectral density of particulate recording media

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1 Author(s)
Thurlings, L. ; Philips Electro-Acoustics Division, Eindhoven, The Netherlands

The ac-noise power spectrum is investigated. Because of the interaction forces between the particles, the structure of the particulate layer has a dominant influence. This structure is quantified by means of the dc-noise power spectrum. Depending on the dispersion and coating technique the duster structure appears to vary. The ac-noise power is described by a mechanism of negative and positive interactions which occur simultaneously. Flux-closuring particles are near to each other at distances less than 0.1 μm, whereas magnetic strings appear to extend over tens of microns.

Published in:

Magnetics, IEEE Transactions on  (Volume:19 ,  Issue: 2 )