Effect of Co- gamma Fe/sub 2/O/sub 3/ particle-size on high density rigid disks

The effects of particle size on the read/write characteristics of Co- gamma Fe/sub 2/O/sub 3/ particulate rigid disks are investigated. Smaller particle size reduces PW/sub 50/, the half-width of an isolated pulse wave, as well as disk noise. The transition region widens as the particle size increases. The change in the transition region seems to originate from the particle size itself, rather than from any inhomogeneity of the magnetic properties. The thickness dependence of the read/write characteristics of ultrathin coated disks using fine Co- gamma Fe/sub 2/O/sub 3/ particles was also investigated. In a 0.12- mu m-thick disk, D/sub 50/ is 36.5 kFCI at 0.20- mu m head flying height.<
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