The effect of the residual magnetic flux density (Br) on the media noise in Co-Cr-Ta alloy thin films has been investigated. Longitudinal media with higher Br and thinner magnetic layer have superior media noise to signal ratio compared to media with lower Br (below 2,000 G) and thicker magnetic layer under the constant Br δ, where δ is the magnetic layer thickness. It was revealed that media noise is proportional to fluctuations in the magnetic transition region according to analysis of the readback waveform. Furthermore, ferrite media exhibits an excellent possibility for use as a low noise media at high recording densities.
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Tsuboi et al. (1994) studied this question.
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