Interpreting Logarithmic Decay
Journal
Journal of Applied Physics
Journal Volume
75
Journal Issue
10
Pages
5505-5507
Date Issued
1994
Author(s)
Abstract
We consider an array of thermally relaxing single domain particles with lognormal distribution of nucleation fields. At a constant applied field we calculate the mean magnetization and the magnetic viscosity and irreversible susceptibility due to thermal activation, and analyze the existence conditions of logarithmic decay and the time interval on which it can be observed. For very narrow distributions multiexponential decay is obtained. An approximate relation between magnetic viscosity and irreversible susceptibility is proposed and the influence of activation volume distribution is included.
Type
journal article