Title :
High speed switching measurements in thin film disk media
Author :
Stinnett, S.M. ; Doyle, W.D. ; Flanders, P.J. ; Dawson, C.
Author_Institution :
Dept. of Phys. & Astron., Alabama Univ., Tuscaloosa, AL, USA
fDate :
7/1/1998 12:00:00 AM
Abstract :
Thermal switching has been recognized as a possible limit to archival storage in advanced high density recording media. Thinner films with more isolated grains suffer from large magnetic viscosities ~10%/decade. Previous work has shown that the observed remanent coercivity HCR(τ) in high viscosity tapes can be predicted from Sharrock´s Law down to 10-9s. Here we report high speed switching results on thin film media which show that the remanent coercivity at 10-8s is increased ~40% relative to the VSM value in these films. A quantitative relationship between the viscosity, irreversible susceptibility, and the increase in HCR (τ) is demonstrated
Keywords :
coercive force; magnetic recording; magnetic susceptibility; magnetic switching; magnetic thin film devices; Sharrock´s Law; advanced high density recording media; archival storage; high speed switching; irreversible susceptibility; magnetic viscosity; remanent coercivity; thermal switching; thin film disk media; Coercive force; Magnetic films; Magnetic heads; Magnetic materials; Magnetic recording; Magnetization; Material storage; Transistors; Velocity measurement; Viscosity;
Journal_Title :
Magnetics, IEEE Transactions on
