F. Zhang et al., Spin-spray ferrite-plated Co ferrite films with high coercivity for perpendicular magnetic recording media, IEEE MAGNET, 35(5), 1999, pp. 2751-2753
Effects of plating conditions on Co ferrite-plated films for perpendicular
magnetic recording media were investigated to increase coercivity H-c perpe
ndicular to and remanence ratio (M-r/M-S)(perpendicular to), in the plane p
erpendicular to the film. By optimizing a concentration of NaNO2 in an oxid
izing solution and the deposition rate, Co-Ni ferrite films with H-c perpen
dicular to of 3200 Oe and (M-r/M-s)(perpendicular to) of 0.6 were obtained
without any heat-treatment. Disk media with higher H-c<^> and (M-r/M-s)<^>
exhibited reproduced waveforms of di-pluses shape and better frequency resp
onses than that with lower H-c<^> and (M-r/M-s)(<^>). Media noise did not i
ncrease with increasing frequency, suggesting that the transition noise was
low.