Abstract
Time (t) dependence of the change in relative magnetization (ΔMrela) for a period of 1000h was investigated for advanced data storage metal particulate (MP) tape and Ba-ferrite (BF) sheets prepared from ultrafine articles at 295 to 338K. Time dependence of ΔMrela at 295K in all samples obeyed a logarithmic law for 1000h. ΔMrela/log t at all temperatures for BF sheet was much larger than that of MP tape because of lower anisotropy field component. Relative permanent magnetization loss due to the oxidation for MP tape at 295K was negligibly, however it increased as temperature increased.
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