Title :
Spin-spray ferrite-plated Co ferrite films with high coercivity for perpendicular magnetic recording media
Author :
Zhang, Fuchun ; Kantake, Shusuke ; Kitamoto, Yoshitaka ; Abe, Masanori
Author_Institution :
Dept. of Phys. Electron., Tokyo Inst. of Technol., Japan
fDate :
9/1/1999 12:00:00 AM
Abstract :
Effects of plating conditions on Co ferrite-plated films for perpendicular magnetic recording media were investigated to increase coercivity Hc⊥ and remanence ratio (Mr/Ms)⊥ in the plane perpendicular to the film. By optimizing a concentration of NaNO2 in an oxidizing solution and the deposition rate, Co-Ni ferrite films with Hc⊥ of 3200 Oe and (Mr/Ms )⊥ of 0.6 were obtained without any heat-treatment. Disk media with higher Hc⊥ and (Mr /Ms)⊥, exhibited reproduced waveforms of di-pluses shape and better frequency responses than that with lower c⊥ and (Mr/Ms)⊥. Media noise did not increase with increasing frequency, suggesting that the transition noise was low
Keywords :
coercive force; ferrites; hard discs; magnetic recording noise; magnetic thin film devices; magnetic thin films; perpendicular magnetic recording; remanence; spin coating; spray coating techniques; CoFe2O4; coercivity; deposition rate; disk media; ferrite thin film recording media; frequency responses; media noise; oxidizing solution; perpendicular magnetic recording media; plating conditions; remanence ratio; spin-spray ferrite plating; transition noise; Coercive force; Crystallization; Ferrite films; Magnetic films; Magnetic noise; Noise shaping; Perpendicular magnetic recording; Remanence; Spinning; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
