Information loss due to thermal activation is a major concern in ultrahigh-density magnetic recording media. The usually considered mechanism is thermally activated magnetization reversal over micromagnetic energy barriers. However, micromagnetic approaches ignore local anisotropy fluctuations, which translate into a time-dependent reduction of the remanent magnetization. The effect is negligibly small in macroscopic magnets but becomes important on a scale of a few nanometers.
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Zhou, J., Skomski, R., Michalski, S. et al. Fast and Slow Magnetization Processes in Magnetic Recording Media. MRS Online Proceedings Library 887, 8870708 (2006). https://doi.org/10.1557/PROC-0887-Q07-08