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High speed switching measurements in thin film disk media

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4 Author(s)
Stinnett, S.M. ; Dept. of Phys. & Astron., Alabama Univ., Tuscaloosa, AL, USA ; Doyle, W.D. ; Flanders, P.J. ; Dawson, C.

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

Published in:

Magnetics, IEEE Transactions on  (Volume:34 ,  Issue: 4 )

Date of Publication:

Jul 1998

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