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 -1Q%/decade. Previous work has shown that the observed remanent coercivity H,,(s) in high viscosity tapes can be predicted from Sharrock's Law down to 109s. Here we report high speed switching results on thin film media which show that the remanent coercivity at 10% is increased -40% relative to the VSM value in these films. A quantitative relationship between the viscosity, irreversible susceptibility, and the increase in HCR(s) is demonstrated.

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