Title :
Magnetic and recording characteristics of very thin metal-film media
Author :
Sanders, I.L. ; Yogi, T. ; Howard, J.K. ; Lambert, S.E. ; Gorman, G.L. ; Hwang, C.
Author_Institution :
IBM Almaden Res. Center, San Jose, CA, USA
fDate :
9/1/1989 12:00:00 AM
Abstract :
The recording performance of very thin sputtered Co-alloy longitudinal film media has been examined. Measurements made using magnetic layers as thin as 50 Å show that the thinner films exhibit improved signal-to-noise characteristics. Similar trends have been observed in both CoNiCr and CoPtCr alloys on Cr and CrV underlayers. Improvement in signal-to-noise ratio is accompanied by a reduction in coercivity squareness as the film thickness is reduced. Large variations of coercivity with film thickness are also observed in the range 50-300 Å. It is suggested that changes in grain size and grain boundary separation during the early stages of film growth play a role in these effects
Keywords :
chromium alloys; cobalt alloys; coercive force; grain boundary segregation; grain size; magnetic recording; magnetic thin films; nickel alloys; platinum alloys; sputtered coatings; 50 to 300 Å; CoNiCr; CoPtCr; Cr; CrV; coercivity squareness; film growth; grain boundary separation; grain size; longitudinal film media; recording performance; signal-to-noise characteristics; Coercive force; Extraterrestrial measurements; Magnetic films; Magnetic noise; Magnetic recording; Magnetic separation; Magnetosphere; Noise level; Saturation magnetization; Signal to noise ratio;
Journal_Title :
Magnetics, IEEE Transactions on
