Experimental test of the Preisach-Arrhenius model with temperature

The magnetic aftereffect was measured for a magnetic particle tape over a t emperature range of 10-380 K. Data were obtained for the saturation magneti zation, the coercive held, and the remanent coercive held as a function of temperature. Switching field distributions and other Preisach parameters we re also determined as a function of temperature. Based on these data, the P reisach-Arrhenius (PA) model predicts that the decay rate, S, should decrea se monotonically as the temperature is reduced. It was found that, for the material studied, S is nearly proportional to temperature, T, for T between about 150 and 380 K, in good agreement with the PA model, but that there i s considerable deviation for T < 150 K and a temperature range exists over which S increases with decreasing temperature. A modification of the PA mod el is required to explain this low-temperature behavior is briefly noted. ( C) 2000 Elsevier Science B.V. All rights reserved.