Thermal Decay of N-Coupled Particles
Journal
Journal of Applied Physics
Journal Volume
76
Journal Issue
10
Pages
6588-6590
Date Issued
1994
Author(s)
Abstract
A periodic chain of N magnetostatically coupled uniaxial particles is considered within the nearest-neighbor approximation of weak coupling. The time-dependent magnetization of the ensemble, which relaxes thermally in constant reversing field, is calculated using a master equation approach. It is found that at very small applied fields the net magnetization relaxes via simple exponential decay while at large reversing fields its relaxation becomes multiexponential. It is conjectured that at large N this effect gives rise to field induced logarithmic decay.
Type
journal article