Temperature variation of magnetic aftereffect

The paper analyzes the anomalous behavior of the magnetic aftereffect decay coefficient with temperature, which has been established experimentally fr om a thermodynamic point of view. The Arrhenius law, which has often been u sed to model magnetic aftereffect, is based on the Maxwell-Boltzmann (MB) s tatistics. At low temperatures, however, magnons obey Bose-Einstein (BE) st atistics, which have a different energy spectrum. MB statistics are a good approximation to BE statistics in the temperature range in which most devic es operate. The variation in temperature, governed by chemical potential th at is essentially linear, has a negative slope and is zero below a low but finite temperature. Other explanations for this anomalous behavior would pr edict an incorrect type of temperature dependence. This new interpretation of magnetic aftereffect may have profound implications on accelerated testi ng to determine life expectancy of recordings.