Plasma polymerized protective films for plated magnetic disks

摘要

AbstractPlasma polymerized protective films (PPP films) for magnetic disks have been investigated in order to improve weak durability of plated disk media to head friction and clash. The thickness heterogeneity of PPP films within 5 was realized around the all surface of 140 mmϕmodel substrates, determining the best discharge condition and apparatus geometry, which did not exert and aggravating influence upon head floating. The friction coefficients of PPP films to a ferrite slider of 0.3 ∼ 0.4 were obtained in the thickness of above near 1500 Å, although PPP films are composed of hydrocarbon or fluorocarbon. As the results of contact start/stop cycle tests by a floating head, plasma polymerized toluene‐2,4‐diisocyanate films show good abrasive durability because of its superior adhesiveness to metal substrates, and PPP films in small thickness near 1000 Å give good protective films. The result of read/write tests indicated that the magnetic deterioration and instability of plated disk media did not occur by the process of plasma polyme