Materials Research Science and Engineering Center


Date of this Version



Published in Mater. Res. Soc. Symp. Proc. Vol. 887. Copyright © 2006 Materials Research Society. Used by permission.


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.